How to use Masked Edit Extender in ASP.NET



In this article, I will show you step by step procedure, how to use a Masked Edit Extender
In ASP.NET using Visual Studio 2005 or Visual Studio 2008.

The use of Masked Edit Extender it that you are not require to type any number of character you have to just select from the up down button…it will change dynamically when you click the button,

To follow this code sample, you must use Visual Studio 2005 or Visual Studio 2008.

Note : I have used to comment HTML part of the code.

Note: Masked Edit Extender is a part of AjaxControlToolkit.

To attach right click on the toolbox under Ajax Extensions and select Choose Items – > Browse Button – > select the AjaxControlToolkit.dll. If you are using Visual Studio 2008, you may not need AJAX Toolkit but if you are using Visual Studio 2005, you will need to download it from or

Here is step by step to implement a sample using mask extender.

Step 1.

Start -> All Programs -> Visual Studio 2005 or Visual Studio 2008

Step 2.

Now go to File Menu -> New -> Web Site

Step 3.

Under Visual Studio Installed Template-> Choose ASP.NET WEB SITE -> Choose File System from the location combo box -> Set the path by the browse button – > Choose the language from the Language ComboBox (Visual C# , Visual Basic , J #) Choose Visual C#.

Step 4.

Click on the OK Button.

This is the source code window and in this page you will se this code.

Type your webpage title here  

<form id=””form1?”


See here is a tab named Design in the bottom of this page.

Step 5.


Click on this tab and you will see a blank web page where you can drag any control from the toolbox (which is in the left side of this window).

Step 6.

Now drag controls under the AJAX Extensions.

First control you are going to drag and drop on the page is – Script Manager.

First register the ajaxtoolkit in the page. Thena dd the code below:

Enter the details below in
the textboxes and you will see how the masked control





MinimumValueMessage=”Please enter correct

roll number” MaximumValueMessage=”Invalid roll number! The highest roll

number is
105″ Display=”Dynamic” IsValidEmpty=”false”

InvalidValueMessage=”The roll number does not exist”
EmptyValueMessage=”The roll number is not entered”>

Step 7.

Now run your web site by Ctrl + F5

Step 8.

When you run the Masked Edit Extender will seem like this following

Now in the Masked text can’t enter characters or hexadecimal values you can only enter digits and here will be some restrictions. which the masked text box will follow.