Microsoft Developer Network Bangladesh

Restrict the size of file uploads in ASP.NET

MD.MONJURUL HABIB — Thu, 15 Sep 2011 20:26:23 GMT

Place the following code in web.config within <system.web> </system.web>.

Specific directories rather than entire application:

<location path="Upload">
    <system.web>
        <httpRuntime executionTimeout="9999" maxRequestLength="2097151" />
    </system.web>
</location>
For individual uploader:
int maxSize = 2097151;
if (FileUpload1.HasFile && FileUpload1.PostedFile.ContentLeng th <= maxSize)
{
   //put some logic

}
Entire Application
<system.web>
<httpRuntime executionTimeout="9999" maxRequestLength="2097151"/>
</system.web>

jQueryUI DatePicker: Disable days in a week

MD.MONJURUL HABIB — Thu, 15 Sep 2011 20:21:32 GMT

We already know how to use the jQuery UI DatePicker in ASP.NET. Here is a good reference.

I'm working with people who have a need for a DatePicker where users can only select Wednesday, Thursday, and Friday. And in addition, the user will not able to select any past date either. Following are the steps:

Make sure you add the following js and css files.

jquery-1.4.1.min.js
jquery.ui.core.js
jquery.ui.datepicker.js
jquery-ui-1.8.8.custom.css

Now user the following code and you will find the result:

<script type="text/javascript">
    $(function () {
        var date = new Date();
        var currentMonth = date.getMonth(); // current month
        var currentDate = date.getDate(); // current date
        var currentYear = date.getFullYear(); //this year
        $("#<%= tbxRequestDeliveryDate.ClientID %>").datepicker({
            changeMonth: true, // this will allow users to chnage the month
            changeYear: true, // this will allow users to chnage the year
            minDate: new Date(currentYear, currentMonth, currentDate),
            beforeShowDay: function (date) { // this will execute before showing the calender on your browser
                if (date.getDay() == 0 || date.getDay() == 1 || date.getDay() == 6) {
                    return [false, ''];
                } else {
                    return [true, ''];
                }
            }
        });

    });
</script>
<asp:TextBox ID="tbxRequestDeliveryDate" runat="server" CssClass="text"></asp:TextBox>

দীর্ঘ দিন যাবৎ এমএসডিএনবাংলাদেশ ফোরামে ডুকছি কিন্তু কোন পোষ্ট পড়তে পারছি না।

Muhammad Muzammel Haque — Wed, 27 Apr 2011 11:31:52 GMT

উপায় তাকলে বলেন।

Ie8 help

Mackenzie — Thu, 03 Feb 2011 20:40:07 GMT

Hi all,
recently I have placed a TV next to my PC to watch something when I am doing boring tasks that I can use as monitor by an HDMI cable.
When I use it as a monitor I can watch movies too, for example connecting to the RAI site that has a lot of recorded clip in streaming.
I have still a problem: when I open with explorer the RAI site (that uses silverlight) and I drag it to the 2° monitor (and keep firefox in the first monitor to navigate) and maximize the clip to full screen, when i go back to the first monitor and click somewhere the movie go back to a little dimension: in practice I can keep it at full screen only if I don't touch anything.
Does anyone know how can I fix this problem?
Thank you

__________________
Never seen valentines day gift like these! (regali originali per san valentino on italian or regalos originales para san valentín on espanol), cioccolato

ADO.NET Entity Model Design framework and traditional n-tier architechture

Sakib bin Sharif — Sat, 25 Dec 2010 13:02:24 GMT

hi,

recently i've studied on ADO.NET's Entity Model Framework and say 'wow' as ORM is one of the fevourite pattern i practice..but suddenly i've come to an ambiguous situation when i'm going to start....

i usually follow the following 3-tier architecture..

1. UI Layer

2. BLL or business logic layer

3. DAL Data Access Layer

a. DTO / DAO

b. Gateway (contains the sql query/stored procedure and connection with DB)

now when i'm going to use the Entity Model Design,where the DBML/ .edmx File should be placed !?!!!

Because many a times i'm using the DBML file as DTO because of the mapped objects.. in the same time, sometimes DBML ( .edmx file in .NET 4.0) contains CRUD methods and stored procedured method as well as methods with different selection operations,- which should be in Gateway......

so where the .edmx file should be placed !?!! IN DTO namespace !? or in Gateway namespace !!!

moreover sometimes there is no need for the BLL which breaks the rules of inter-layer-communication (UI > BLL > DAL.Gateway) .. !!!

what makes me confuse is, what should be the ideal n-tier architecture when i'll use the ADO.NET Entity Model Design Framework...

Technet Blogging Fiesta

Md Nazmul Ahsan — Sun, 14 Nov 2010 19:47:43 GMT

If you are a technical blogger, you have a chance to win BDT 1,00,000.00.

For more click here .

The Blog Fiesta competition is organized by Microsoft Bangladesh in association with IEEE Student Branch, KUET. The Blog Fiesta competition is open to all Bangladeshi residents above 14 years of age.

how load an image from directory and Resize on fly and display it.

Sakib bin Sharif — Wed, 23 Jun 2010 11:55:05 GMT

hi,

i am facing a prblem about image resizing.. i know it is a common problem but the scinario is little different here.

i have some image in my server image directory and also have their small 128 X 128 sized thumbnail..i show a page with those images like 'facebook photo album' and also linked another page to display them..when a picture is clicked it refferd to that page and that page loads the full sized original image along with picture comments bla bla..., the page width is fixed to 1024px, and the div's width is 800px max which contains the <asp:image..../>; that shows the full sized image.

here the problem comes, when a original sized picture is greater that 800px then the remaining part of the picture is croped !! i know it will happen.. that is why i planned to show a thumbnail like pic which's size will be 800px max and link the page with a pop up java script page which will contain the full sized picture only. ..

the problem is i can't resize the picture in a limit of 800px on fly.

can anyone please help? :( i googled for 2days for resizing but all are those for thumbnail resizing which is saved to directory.. which couldn't help me in this

Silverlight game expert required

Rubayat Asirul Bari — Tue, 12 Oct 2010 03:54:04 GMT

We require a silverlight game expert. Contact us immediately at career@simplexhub.com. Send us some demonstration of your work if you have any.

Which path you have to use in your application?

Ahsan Murshed — Mon, 07 Jun 2010 10:12:12 GMT

What is Absolute path?

Absolute paths are called that because they refer to the very specific location, including the domain name. The absolute path to a Web element is also often referred to as the URL. For example, the absolute path to this Web page is: http://aspboss.blogspot.com/2010/04/how-to-get-client-ip-address-using.html

What is Relative path?
Relative paths change depending upon what page the links are located on. Another word,A relative path is a path relative to the working directory of the user or application, so the full absolute path may not need to be given. There are several rules to creating a link using the relative path:

links in the same directory as the page have no path information listed filename

sub-directories are listed without any preceding slashes weekly/file-name

links up one directory are listed as ../filename

Linking to a resource from a reusable control in different levels in your web app folder tree can be a tedious and not so obvious task.

Now have a look where to use absolute paths or relative paths

    1.Absolute paths - http://www.yoururl.com/a/b/c/page.aspx - It is not acceptable for reusable components.
    2. Relative paths
          o current level based - a/b/c/page.aspx - Doesn't work for reusable components.
          o root based - /a/b/c/page.aspx - That works good in some cases but not in every.
          o app based - ~/a/b/c/page.aspx - Perfect when you can use it

What's wrong with root based paths?

When you work on a project you often use built-in WebServer of the Visual Studio and your app runs on http://localhost:XXXX/. Everything seems to be working fine with the root based paths. Now it's time to deploy your app on a test machine. You deploy it on http://test/myBestApp/. Now all your root based paths are pointing to http://test/Page.aspx instead of http://test/myBestApp/Page.aspx. That's a good reason not to use root based paths.

Is ~ (tilde) can solve it?

That's a good solution that comes out of the box and takes care finding the root of your app. Ok, but what if need to build the URL on the fly like in this example:

~/Item.aspx?id=<% Request.QueryString[ "id" ] %>

This won't work if you put it in a Hyperlink like this:

<asp:hyperlink id="hlnkItemDetails" navigateurl="~/Item.aspx?id=<% Request.QueryString[ "id" ] %>" runat="server">

Don't think about changing the quotation marks. It won't work however you try.

The universal solution - Page.ResolveUrl

Now that's what can help you in every situation (or at least all cases I can think of).
Think about this case: you have a custom control in ~/items/controls/ItemViewControl.ascx. This control is used in ~/Default.aspx and ~/items/Default.aspx. You need to link to ~/items/Item.aspx?id=<query param="" string="">from ItemViewControl.ascx.

You can't use ~ (tilde), root based, current folder relative or absolute path for some of the reasons written above.

This is where Page.ResoulveUrl comes into help. You can build your link in this way:

<a href='<% String.Format( "{0}?id={1}", Page.ResolveUrl( "~/items/Item.aspx" ), Request.QueryString[ "id" ] %>'></a>

Yes, it is a bit complicated, but at least you won't be worried about broken links and they will work as expected wherever you put them.

For more info please visits my blog: http://aspboss.blogspot.com/

What is Object oriented Programming?

Ahsan Murshed — Tue, 08 Jun 2010 07:05:44 GMT

What is OOP?

Object-oriented software is all about objects. An object is a "black box" which receives and sends messages. A black box actually contains code (sequences of computer instructions) and data (information which the instructions operates on).

OOP is stands for Object Oriented Programming. Object-Oriented Programming (OOP) uses a different set of programming languages(java,C++,c#..).

In Object Oriented Programming techniques may include features such as data abstraction, encapsulation, modularity, polymorphism, and inheritance. It was not commonly used in mainstream software application development until the early 1990s. Many modern programming languages now support OOP.

What is Object?

An object can be considered an "entity" that can perform a set of related activities. The set of activities that the object performs defines the object's behavior.

In another word, an object is any entity that can be manipulated by the commands of a programming language, such as a value, variable, function, or data structure.

For more details:

Please visits here...

New Here, Looking for help

Abdullah Al Jahid — Fri, 04 Jun 2010 05:02:45 GMT

Hi everyone. I'm Abdullah Al Jahid professional PHP developer, working as a PHP developer for a Jordanian Company and also doing freelance work. I'm reading in class 10. more info - shakti-world.com
I'm very interested in Developing desktop based application and work with C++, C# and silverlight.

But I'm kind a confuse where to start. I first tried with VB, but its easy to make its UI but can't understand how to work with codes and DB. I prefer to use Code. So I want to learn coding.

So please give me some resources where I can start learning C# , Silverlight from scratch to develop large application. I tried video section in this site, but its not working. I will prefer video tutorial.

Waiting for your response.

Thank you everyone.

Creating Object to a Class dynamically using Reflection

Ahsan Murshed — Mon, 07 Jun 2010 10:29:19 GMT

What is Reflection?

Reflection is the feature in .Net, which enables us to get some information about object in run time. That information contains data of the class. Also it can get the names of the methods that are inside the class and constructors of that object.

To write a C# .Net program which uses reflection, the program should use the namespace System.Reflection. To get type of the object, the typeof operator can be used. There is one more method GetType(). This also can be used for retrieving the type information of a class. The Operator typeof allow us to get class name of our object and GetType() method uses to get data about object's type.

One can use the Activator class for creating objects and then you can use reflection to call methods on the new instance, e.g.:

Example-1: C#
In this example simply show that how to create instance of a object dynamically,

using System;
using System.Runtime.Remoting;
using System.Reflection;
namespace ConsoleApplication3
{
interface IBase
{
void fu();
}
class Emp: IBase
{
public void fu()
{
Console.Write("Hello");
}
}
class Class1
{
[STAThread]
static void Main(string[] args)
{
Type type = Type.GetType("ConsoleApplication3.Emp");
IBase obj = (IBase)Activator.CreateInstance(type);
obj.fu();
}
}

For more detail information please visits:

http://aspboss.blogspot.com/2010/05/creating-object-to-class-dynamically.html

How to get the MAC address of system using C#

Ahsan Murshed — Mon, 10 May 2010 06:05:53 GMT

Now I want to share with you some simple but important for our rapid development.
Here I want to discuss how to get system MAC address using c# ,

First way:
You need to import the System.Net namespace for this to work.
This will support IPv4 and IPv6.

NetworkInterface[] nics = NetworkInterface.GetAllNetworkInterfaces();
foreach (NetworkInterface adapter in nics)
    {
        IPInterfaceProperties properties = adapter.GetIPProperties();
        adapter.GetPhysicalAddress().ToString();
    }

Second way:

public string GetMACAddress()
{
ManagementClass mc = new ManagementClass("Win32_NetworkAdapterConfiguration");
ManagementObjectCollection moc = mc.GetInstances();
string MACAddress = String.Empty;
foreach (ManagementObject mo in moc)
{
     if (MACAddress == String.Empty) // only return MAC Address from first card
           {
              if ((bool)mo["IPEnabled"] == true) MACAddress = mo["MacAddress"].ToString();
           }
      mo.Dispose();
}

MACAddress = MACAddress.Replace(":", "");
return MACAddress;
}

You might want to also add "mo["Caption"].ToString()" to test before the mac address so that you know which devices you are looking at.
Also, don't forget to use try/catch blocks on these as a NullPointerReference will kill the app.

For more info: Pls visits:

http://aspboss.blogspot.com/2010/04/how-to-get-mac-address-using-c.html

http://www.c-sharpcorner.com/UploadFile/ahsanm.m/1084/?ArticleID=aeb8667f-2edd-4da9-8fcf-8c7ceef4d43f

Use of TempDB system database to fater your application

Altaf — Fri, 28 May 2010 18:23:25 GMT

In many cases we often need to store data in some temporary table. One of this case often used within Stored Procedures, when it is not necessarily need to persist the data beyond the scope of the store procedure.

If in cases we need to store data in a table structure we can use temporary tables and for that SQL server provides two types of temporary table. These tables are stored in the ‘tempdb’ system database and their persistence availability and accessibility depend on the type of temporary table. These types are:

1. Local Temporary table (#table: Single # table)

2. Global temporary table (##table: Double # table)

There is another type of temporary table called ‘@table variable’ which is stored in memory not in ‘tempdb’. So this is out of scope of the context.

Local temporary table- Characteristics and when should be used:

· The table local temp table and data stored in it only accessible from the current scope/operation i.e. usually the store procedure using it or nested store procedure.

· These tables get cleared automatically when the current procedure goes out of scope. So, this is better on resources as it release resources early.

· Created with the given name with a session-specific identifier so that it could be distinguishable from similar named local temp table.

· Most common use of this type of table is examining data coming from another stored procedure.

· It reduces the amount of locking required opposed to the permanent table as only the current user accessing the table.

· Also performance can be gained by placing tempdb on a separate disk.

To create local temp table:
CREATE TABLE #tempTable

{

Id INT,

Name Varchar(32)

}

Global temporary table- Characteristics and when should be used:

· The Global temporary table is accessible throughout the session and visible by all other user session when a session is referencing to it.

· Global temporary table remains in the database permanently, but rows exist only within a given session. As the session ended the data in the table cleared but the table structure remains.

To create Global temp table:
CREATE TABLE ##globalTable

{

Id INT,

Name Varchar(32)

}

Prevent Duplicate record insertion on page refresh in asp.net

Ahsan Murshed — Sun, 25 Apr 2010 10:23:50 GMT

Problem:
Today I have faced a new problem(new for me), when I press save button it works fine and then refresh(F5 or Refresh button on browser) the page but this time it is execute the button click event again. For this duplicate data posting on the server.

I try to find out the problem, nothing wrong in my code. Now turn to google and figure out the problem with solution. I have got several solutions. Now I would like to share this solution which solved my problem ......

Solution:

Assume that in Test.aspx page you have a button and a TextBox:

<asp:Button ID="btnSubmit" runat="server" Text="Submit" Width="110px" OnClick="btnSubmit_Click" />
<asp:TextBox ID="TxtName" runat="server"></asp:TextBox>

In Test.aspx.cs..:

public partial class Test : System.Web.UI.Page
{
protected override void OnInit(EventArgs e)
{
btnSubmit.Click += new EventHandler(btnSubmit_Click);base.OnInit(e);
}
protected void Page_Load(object sender, EventArgs e)
{

}
private void Save_Click(object sender, EventArgs e)
{
if (CheckIfDuplicateRequest())

{
return;

}
//Your code to insert the value of the SomeText textbox into the database.
//Set the value of one of the key fields in your web form in session
Session["Refresh"] = TxtName.Text;

}

private Boolean CheckIfDuplicateRequest()
{
if (Session["Refresh"] == null)
{
//Probably submitting the page for the first time
return false;
}
String previousValue = Session["Refresh"].ToString();
if (previousValue != TxtName.Text)
{
//Submitting the page with a different set of values
return false;
}
//Duplicate request.
return true;
}

}

you can get more help from these post:

http://aspboss.blogspot.com/

http://aspalliance.com/687
http://forums.asp.net/p/1296011/3702515.aspx
http://forums.asp.net/p/1190997/2045619.aspx

Understanding Static Methods and Data

kaktarua — Sun, 23 May 2010 04:43:38 GMT

Normal 0 false false false EN-US X-NONE X-NONE MicrosoftInternetExplorer4

Understanding Static Methods and Data

Static keyword is widely used to share the same field or method among all the objects of the class. The actual goal of the static keyword is to share a single data over all the objects.

There are three types of sharing using the static keyword. They are –

Ø Static Method

Ø Static Field

Ø Static Class

Now I am going to give a short brief on these three types-

Static Method

A Static Method can be accessed from outside the class without creating any object of this class. This Static Method can be accessed by directly by the name of the static method followed by the . (dot operator) and the class name.

For example, we can consider the Sqrt method of the Math class. This is how the Sqrt method of the real Math class is defined :

class Math

{

……….

public static double Sqrt (double d)

{

………………………

}

From the previous example you can notify that the Sqrt method is declared as static so that it can be accessed by using the class name directly,no object of the Math class is required to access the static method.

So, here I will like to some general properties of a Static Method :

ü It can access only the static fields of the class.

ü It can directly invoke the methods that are defined as static.

Static Fields

A static field is shared among all the objects of the of the class. So if an object change this the value then all the object of this class will get the changed value.

Look at the example below –

class Point

{

public Point()

{

this.x = -1;

this.y = -1;

Console.WriteLine("Deafult Constructor Called");

objectCount++;

}

public Point(int x, int y)

{

this.x = x;

this.y = y;

Console.WriteLine("x = {0} , y = {1}", x, y);

objectCount++;

}

private int x, y;

public static int objectCount = 0;

}

Now if we create three objects for this class –

Point origin1 = new Point(); // objectCount = 1

Point origin2 = new Point(); // objectCount = 2

Point origin3 = new Point(); // objectCount = 3

Here these three objects share the same field so evry time the static field objectCount is incremented.

Static Class

A static class is used to hold all the utility methods and fields. A static Class has some properties –

All the methods and fields inside the class must be declared as static.
A static class cannot contain any instance method or data.
No object can be created (even using the “new” keyword) of this class.
It can has a default constructor and it is also static.

Example

Let us consider an example –

Point.cs

using System;

using System.Collections.Generic;

using System.Text;

namespace ConAppCH7CCons

{

class Point

{

public Point()

{

this.x = -1;

this.y = -1;

Console.WriteLine("Deafult Constructor Called");

objectCount++;

}

public Point(int x, int y)

{

this.x = x;

this.y = y;

Console.WriteLine("x = {0} , y = {1}", x, y);

objectCount++;

}

public double DistanceTo(Point other)

{

int xDiff = this.x - other.x;

int yDiff = this.y - other.y;

return Math.Sqrt((xDiff * xDiff) + (yDiff * yDiff));

}

public static int FnObjectCount()

{

return objectCount;

}

private int x, y;

private static int objectCount = 0;

}

ConstructorExample.cs

using System;

using System.Collections.Generic;

using System.Text;

namespace ConAppCH7CCons

{

class ConstructorExample

{

static void Main(string[] args)

{

Point origin = new Point();

Point bottomRight = new Point(1024, 1280);

double distance = origin.DistanceTo(bottomRight);

Console.WriteLine("distance = {0}",distance);

Console.WriteLine("No of Objects {0}", Point.FnObjectCount());

Console.ReadLine();

}

In this example the FnObjectCount()method is called directly with the class name, no object is reqired here.

If you want to access the static method with an object like –

bottomRight.FnObjectCount()// do not write this

then the compiler will report an error.

Now, give a deeper look into the FnObjectCount() static mehod –

public static int FnObjectCount()

{

return objectCount;

}

As it is a static method, so it can hold only static field or ststic mehod.

Constructor in C# (For the Beginners)

kaktarua — Thu, 20 May 2010 04:56:17 GMT

Normal 0 false false false EN-US X-NONE X-NONE MicrosoftInternetExplorer4

Constructor

Constructor is a simple method inside a class. Except it has some exceptions:

Ø Constructor has the same name as the class.

Ø Constructor does not return value even void.

Ø Constructor can be built with parameter or without parameter.

Ø Every class has a default constructor Even if did not create it. If the developer does not create a constructor then the .NET compiler create a default constructor, this deafault constructor actually does nothing.

You can easily create a default constructor by creating a method like this :

class Point

{

public Point()

{

this.x = -1;

this.y = -1;

}

private int x, y;

}

Have a look on the example, there are two private variable x and y. So when an instance of the class point will be created the constructor will be fired and the variable x and y will get their value as -1 , -1 accordingly.

[ Here one thing is noticable, why I have used “this” keyword? I have told earlier that a constructor may be paremeterized or non-parameterized . if it is parameterized and I write it as

class Point

{

public Point(int x , int y)// do not write as this

{

x = x;//what is the parameter and what is the feild

y = y;// what is the parameter and what is the feild

}

private int x, y;

}

Though the program will run but it is little ambiguous which one the parameter andwhich one is the field.

The “this” keyword indicates that – “this is a field”]

Now you can initialize your object by the constructor Point(). Like this way –

namespace ConAppCH7CCons

{

class ConstructorExample

{

static void Main(string[] args)

{

Point origin = new Point();

Console.ReadLine();

}

So, when the “origin” object is created it it is initialized with the value

x=-1

y=-1

Overriding a Constructor

Overriding is a feture of OOP and an example of Polymorphism. Constructor overloading is very simple as method overloading. You can have different version of constructors and they can vary by the number of parameter and type of parameter.

From the preeciding example , let uss, you do not want to initialize your x and y value with different values and in the mean time you want to keep an option that the user can run the program without any value. In this situation you can code like this :

namespace ConAppCH7CCons

{

class Point

{

public Point()

{

this.x = -1;

this.y = -1;

Console.WriteLine("Deafult Constructor Called");

}

public Point(int x, int y)

{

this.x = x;

this.y = y;

Console.WriteLine("x = {0} , y = {1}", x, y);

}

private int x, y;

}

Now you have two different versions of constructor. You can create objects like bellow :

namespace ConAppCH7CCons

{

class ConstructorExample

{

static void Main(string[] args)

{

Point origin = new Point();

Point bottomRight = new Point(1024, 1280);

Console.ReadLine();

}

So when when the object “origin” is initiated then

x=-1

y=-1

and when the object “bottomRight” is initiated then

x=1024

y=1280

Example

Here I will show an example related on constructor. This example is for calculate the distance between two given points-

Point.cs

using System;

using System.Collections.Generic;

using System.Text;

namespace ConAppCH7CCons

{

class Point

{

public Point()

{

this.x = -1;

this.y = -1;

Console.WriteLine("Deafult Constructor Called");

}

public Point(int x, int y)

{

this.x = x;

this.y = y;

Console.WriteLine("x = {0} , y = {1}", x, y);

}

public double DistanceTo(Point other)

{

int xDiff = this.x - other.x;

int yDiff = this.y - other.y;

return Math.Sqrt((xDiff * xDiff) + (yDiff * yDiff));

}

private int x, y;

}

ConstructorExample.cs

using System;

using System.Collections.Generic;

using System.Text;

namespace ConAppCH7CCons

{

class ConstructorExample

{

static void Main(string[] args)

{

Point origin = new Point();

Point bottomRight = new Point(1024, 1280);

double distance = origin.DistanceTo(bottomRight);

Console.WriteLine("distance = {0}",distance);

Console.ReadLine();

}

Visual Studio 2010 Community Launch

Md Nazmul Ahsan — Mon, 03 May 2010 05:11:30 GMT

Visual Studio 2010 Community Launch

Date:	Saturday, 08 May 2010
Time:	10:30 - 14:00
Location:	Auditorium, IDB Bhaban
Street:	Sher-E-Bangla Nagar
Town/City:	Dhaka, Bangladesh

For more details : http://www.facebook.com/event.php?eid=122898944394255

Visual Studio 2010 Community Launch Successfully!!

Ahsan Murshed — Mon, 10 May 2010 05:55:17 GMT

Visual Studio 2010 community launch program successfully held at 8 May 2010. Really its a great events those who are attends at that program. Trust me, those who are failed to attend this ceremony they missed a great event. C# 4.0 Demystified presented by Tanzim bhai and Silverlight for Windows Mobile 7 using VS 2010 presented by Asif bhai make this events more fruitful specially for developers. And Omi bhai organized the whole ceremony very nicely.

Request format is unrecognized for URL unexpectedly ending

Ahsan Murshed — Tue, 27 Apr 2010 06:12:40 GMT

Today I want to share with you a new problem which I had faced yesterday.
Problem:
It was about web service related error. I have used Web Method() in my application to fill up a country dropdown. Everything was going well but when I had used this web method it showed me an error like this:

System.InvalidOperationException: Request format is unrecognized for URL unexpectedly ending in '/GetCountyList'.

Information:
After googling, I have found the solution.

This error was occured because GET and POST are disabled by default in ASP.NET 2.0 and greater.

Now I would like to share this with you. From msdn I have got some relative information which may help you to get understand clearly.

The .NET-connected Web services support HTTP GET, HTTP POST and SOAP protocols. By default, in .NET Framework 1.0, all three protocols are enabled. By default, in .NET Framework 1.1 or greater, HTTP GET and HTTP POST are both disabled. This is for security reasons.

Applications that use HTTP GET or HTTP POST to invoke a Web service fail when the Web service is upgraded to .NET Framework 1.1 or greater. These applications receive a exception: System.InvalidOperationException: Request format is unrecognized.

Solution:
HTTP GET and HTTP POST may be enabled by editing the Web.config file for the vroot where the Web service resides. The following configuration enables both HTTP GET and HTTP POST:

<configuration>
<system.web>
<webServices>
<protocols>
<add name="HttpGet"/>
<add name="HttpPost"/>
</protocols>
</webServices>
</system.web>
</configuration>

Single Sign on (SSO) Using Cookie in asp.net

Ahsan Murshed — Sun, 25 Apr 2010 09:54:35 GMT

There are various ways to use Single Sign on(SSO) in asp.net web application. We can use cookies, session (state server), SAML and web services etc. Now we would like to give a brief overview of how to use cookie to implement Single Sign on(SSO) in asp.net web application.

Assume that we have two web application hosted on different virtual directory but under same domain. As for example, our root domain is: http://www.cookietest.com and
Other two virtual directory hosted under this domain are
http://www.cookietest.com/cookiesite1/Login.aspx
http://www.cookietest.com/cookiesite2/Default.aspx

If we login successfully in cookiesite1 then it writes the login information in cookie and now opens another tab or a new window in same browser (IE, FF whatever you like). Place this address http://www.cookietest.com/cookiesite2/Default.aspx in address bar logged in automatically in cookiesite2. When we try to access in cookiesite2 –> Default.aspx it checks the login information from cookie. If desired value found in cookie then you logged in automatically. Remember you need to enable cookie in your browser for all of these activities.

Configuration:
1. Web.Config
Before coding we need to some configure in our web.config file. Though cookiesite1 and cookiesite2 are in different virtual directory their web.config file must contains the same machine validationKey, decryptionKey and validation.

Like this,

<machineKey validationKey="282487E295028E59B8F411ACB689CCD6F39DDD21E6055A3EE480424315994760ADF21B580D8587DB675FA02F79167413044E25309CCCDB647174D5B3D0DD9141"
decryptionKey="8B6697227CBCA902B1A0925D40FAA00B353F2DF4359D2099"
validation="SHA1" />

2. IIS
In IIS->Directory security tab add the "ASPNET Machine Account" user and set the full rights.

Coding:
Write cookie after login complete:
Place this code in cookiesite1->Login.aspx.cs

If(login_Successful)
{
//Create a new cookie, passing the name into the constructor
HttpCookie cookie = new HttpCookie(“strCookieName”);

//Set the cookies value
cookie.Value =”set_cookie_value”;

//Set the cookie to expire in 5 minute
DateTime dtNow = DateTime.Now;
TimeSpan tsMinute = new TimeSpan(0, 0, 5, 0);
cookie.Expires = dtNow + tsMinute;

//Add the cookie
Response.Cookies.Add(cookie);

Response.Write("Cookie written. ");
}

Check cookie is exist or not on page_load
Place this code in cookiesite2->Default.aspx.cs

protected void Page_Load(object sender, EventArgs e)
{
//Grab the cookie
HttpCookie cookie = Request.Cookies[“strCookieName”];

//Check to make sure the cookie exists
if (cookie != null)
{
ReadCookie();
}
Else
{
lblCookie.Text = "Cookie not found. ";
}

}

Read cookie when page load:
Add this method in cookiesite2->Default.aspx.cs

protected void ReadCookie()
{
//Get the cookie name the user entered

//Grab the cookie
HttpCookie cookie = Request.Cookies[“strCookieName”];

//Check to make sure the cookie exists
if (cookie == null)
{
lblCookie.Text = "Cookie not found. ";
}
else
{
//Write the cookie value
String strCookieValue = cookie.Value.ToString();
lblCookie.Text = "The cookie contains: " + strCookieValue + "";
}
}

Test the application in localhost.

And for more information:

http://aspboss.blogspot.com/

http://msdn.microsoft.com/en-us/library/aa289495%28VS.71%29.aspx#vbtchaspnetcookies101anchor10

http://www.aspnettutorials.com/tutorials/network/cookies-csharp.aspx

http://www.developer-corner.com/Resources/KnowledgeBase/tabid/118/articleType/ArticleView/articleId/23/PageID/10/Single-Sign-On-across-multiple-ASPNET-applications.aspx

Visual Studio 2010 now officially released

Md Nazmul Ahsan — Thu, 15 Apr 2010 09:55:53 GMT

Read the following blog for more information

Scott Hanselman - Visual Studio 2010 Released

Visual Studio 2010 and .NET 4 Released - ScottGu's Blog

Enumerate through all the characters of a string using CharEnumerator

Md. Elias Hossain — Thu, 04 Mar 2010 06:20:30 GMT

Enumerate through all the characters of a string using CharEnumerator

CharEnumerator is an object in C# that can be used to enumerate through all the characters of a string. Below is the sample to do that

            string str = "my name";
            CharEnumerator chs = str.GetEnumerator();
            while (chs.MoveNext())
            {
                Console.WriteLine(chs.Current);
            }

Professional Developer (MCPD) Upgrades

Rashedul Islam Sumon — Thu, 25 Feb 2010 12:52:06 GMT

The upgrade paths for the Professional Developer series require that candidates have a minimum existing Microsoft Certified Application Developer certification, although since this is a prerequisite for the Microsoft Certified Solutions Developer series, this also qualifies. Generally candidates who specialised in Windows Forms development in the MCAD would upgrade to the MCPD: Windows Developer, Web developers would take the MCPD: Web Developer path, and MCSD holders would upgrade to the MCPD: Enterprise Applications Developer. However, there is no actual restriction enforced and a candidate holding any variant of the MCAD three MCAD to MCPD paths, and an MCSD can take any of the four MCSD to MCAD paths.

MCAD/MCSD to MCPD: Web Developer This certification requires that one pass the following examination:

Exam 70-551: UPGRADE: MCAD Skills to MCPD: Web Developer by Using the Microsoft .NET Framework

MCAD/MCSD to MCPD: Windows Developer This certification requires that one pass the following examination:

Exam 70-552: UPGRADE: MCAD Skills to MCPD: Windows Developer by Using the Microsoft .NET Framework

MCAD to MCPD: Enterprise Applications Developer This certification requires that one pass the following examinations:

Exam 70-551: UPGRADE: MCAD Skills to MCPD: Web Developer by Using the Microsoft .NET Framework
Exam 70-552: UPGRADE: MCAD Skills to MCPD: Windows Developer by Using the Microsoft .NET Framework

MCSD to MCPD: Enterprise Applications Developer This certification requires that one pass the following examinations:

Exam 70-553: UPGRADE: MCSD Microsoft .NET Skills to MCPD Enterprise Application Developer by Using the Microsoft .NET Framework: Part 1
Exam 70-554: UPGRADE: MCSD Microsoft .NET Skills to MCPD Enterprise Application Developer by Using the Microsoft .NET Framework: Part 2

IT Professional (MCITP) Upgrades

MCDST to MCITP: Enterprise Support This certification requires that one pass the following examination:

Exam 70-621: PRO: Upgrading Your MCDST Certification to MCITP Enterprise Support

MCDBA to MCITP: Database Administrator This certification requires that one pass the following examination:

Prerequisite: MCTS: Microsoft SQL Server 2005 - Implementation and Maintenance

Exam 70-417: UPGRADE: MCDBA Skills to MCITP Database Administrator by Using Microsoft SQL Server 2005

MCSA and MCSE Transitions

MCSA and MCSE certifications will not be retired. Microsoft has introduced a transition path to allow MCSA/MCSE holders to obtain MCITP certification. Both certifications require a transitional exam. To upgrade a MCSA, the 70-648 exam is required as well as one additional exam for MCITP: Server Administrator and three additional exams for the MCITP: Enterprise Administrator. To upgrade a MCSE the 70-649 is required as well as one additional exam for MCITP: Server Administrator and two additional exams for the MCITP: Enterprise Administrator

Latest MCP Certifications

Rashedul Islam Sumon — Thu, 25 Feb 2010 12:48:06 GMT

Microsoft has released a new three-tiered certification hierarchy. It consists of three series and four credentials that introduce an entry-level Technology Series composed of the "Technology Specialist" credential, a Professional Series composed of the "IT Professional" and "Professional Developer" credentials, and the Master Series composed of the "Master" credential. There also exists a new Architect Series composed of the "Microsoft Certified Architect" program which consists of a Review Board interview.

Technology Series for Exams (MCTS)

The Technology Specialist certifications enable professionals to target specific technologies, and are generally the first step toward the Professional-level certifications. There are currently 20 MCTS certifications which can be roughly grouped into the following specializations, each requiring certain examinations to be passed:

Office Specializations

Managing Projects with Microsoft Office Project 2007

Exam 70-632: Microsoft Office Project 2007, Managing Projects

Enterprise Project Management with Microsoft Office Project Server 2007

Exam 70-633: Microsoft Office Project Server 2007, Managing Projects

Forefront Client and Server, Configuration

Exam 70-557: Microsoft Forefront Client and Server, Configuration

Office SharePoint Server 2007, Configuration

Exam 70-630: Microsoft Office SharePoint Server 2007, Configuring

Office SharePoint Server 2007, Application Development

Exam 70-542: Microsoft Office SharePoint Server 2007 - Application Development

.NET Framework Specializations

.NET Framework 2.0 Web Applications

Exam 70-528: .NET Framework 2.0 - Web-Based Client Development
Exam 70-536: .NET Framework 2.0 - Application Development Foundation

.NET Framework 2.0 Windows Applications

Exam 70-526: .NET Framework 2.0 - Windows-Based Client Development
Exam 70-536: .NET Framework 2.0 - Application Development Foundation

.NET Framework 2.0 Distributed Applications

Exam 70-529: .NET Framework 2.0 - Distributed Application Development
Exam 70-536: .NET Framework 2.0 - Application Development Foundation

.NET Framework 3.5, ASP.NET Applications

Exam 70-536: .NET Framework – Application Development Foundation
Exam 70-562: .NET Framework 3.5, ASP.NET Application Development

.NET Framework 3.5, Windows Presentation Foundation Applications

Exam 70-536: TS: .NET Framework – Application Development Foundation
Exam 70-502: TS: .NET Framework 3.5, Windows Presentation Foundation Application Development

.NET Framework 3.5, Windows Communication Foundation Applications

Exam 70-536: TS: .NET Framework – Application Development Foundation
Exam 70-503: TS: .NET Framework 3.5 – Windows Communication Foundation Application Development

.NET Framework 3.5, Windows Workflow Foundation Applications

Exam 70-536: TS: .NET Framework – Application Development Foundation
Exam 70-504: TS: .NET Framework 3.5 – Windows Workflow Foundation Application Development

.NET Framework 3.5, Windows Forms Applications

Exam 70-536: TS: .NET Framework – Application Development Foundation
Exam 70-505: TS: .NET Framework 3.5, Windows Forms Application Development

.NET Framework 3.5, ADO.NET Applications

Exam 70-536: TS: .NET Framework – Application Development Foundation
Exam 70-561: TS: .NET Framework 3.5, ADO.NET Application Development

SQL Server Specializations

SQL Server 2005

Exam 70-431: Microsoft SQL Server 2005 - Implementation and Maintenance

SQL Server 2005 Business Intelligence

Exam 70-445: Microsoft SQL Server 2005 Business Intelligence - Implementation and Maintenance

Business Intelligence Specializations

BizTalk Server 2006

Exam 70-235: Developing Business Process and Integration Solutions Using Microsoft BizTalk Server

Live Communications Server 2005

Exam 70-262: Office Live Communications Server 2005-Implementing, Managing, and Troubleshooting

Microsoft Exchange Server 2007 Configuration

Exam 70-236: Exchange Server 2007, Configuring
Windows Specializations

Windows Mobile 5.0 Applications

Exam 70-540: Windows Mobile 5.0 - Application Development

Windows Mobile 5.0, Implementing and Managing

Exam 70-500: Windows Mobile 5.0, Implementing and Managing

Windows SharePoint Services 3.0, Application Development

Exam 70-541: Windows SharePoint Services 3.0 - Application Development

Windows SharePoint Services 3.0, Configuration

Exam 70-631: Windows SharePoint Services 3.0, Configuring

Windows Vista and 2007 Microsoft Office System Desktops, Deploying and Maintaining

Exam 70-624: Deploying and Maintaining Windows Vista Client and 2007 Microsoft Office System Desktops

Windows Vista Configuration

Exam 70-620: Windows Vista, Configuring

Windows Server 2008 Active Directory Configuration

Exam 70-640: Windows Server 2008 Active Directory, Configuring

Windows Server 2008 Network Infrastructure Configuration

Exam 70-642: Windows Server 2008 Network Infrastructure, Configuring

Windows Server 2008 Applications Infrastructure Configuration

Exam 70-643: Windows Server 2008 Applications Infrastructure, Configuring

Upgrading from Windows Server 2003 MCSA to Windows Server 2008, Technology Specializations

Exam 70-648: Windows Server 2008 Active Directory, Configuring and Windows Server 2008 Network Infrastructure, Configuring: upgrade of Windows Server 2003 to Server 2008 for the two above aforementioned MCTS credentials consisting parts of exams 70-640 and 70-642

Windows 7 Configuration

Exam 70-680: Windows 7, Configuring