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Posted 1 Apr 2009

Mask TextBox ASP.NET Control

, 1 Apr 2009
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An ASP.NET textbox to input bank account or credit card numbers or other kinds of formatted text
maskTextBoxTest_net3 - Click to enlarge image


This ASP.NET control can be used to input bank account or credit card numbers or other kinds of formatted text.


We needed a way to easily input many bank account numbers in the same page, a quick "paste'n go" approach but also with full format and validation support. The page should also load as fast as possible so the control instances are initialized only when they got the focus and the HTML is not bloated with JavaScript snippets.

Many thanks to Diego Perini ( who helped me with his samples to get right some caret JavaScript.

Using the Code

If you look in default.aspx, the page that uses the control, pay attention to the following global variable...

<script type="text/javascript">var mtb;</script>		

... that is shared by the control instances and it gets initialized every time one receives the focus.

Points of Interest

Hopefully I will upload an Ajax version and a Java version soon.

I hope this helps!


  • 2nd April, 2009: Initial post


This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)


About the Author

Software Developer
New Zealand New Zealand

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Comments and Discussions

GeneralMy vote of 5 Pin
Swelborn1-Apr-11 17:46
memberSwelborn1-Apr-11 17:46 
GeneralMy vote of 4 Pin
gstolarov2-Apr-09 4:47
membergstolarov2-Apr-09 4:47 
GeneralRe: My vote of 4 Pin
radumi7-Apr-09 2:26
memberradumi7-Apr-09 2:26 
GeneralMy vote of 1 Pin
Pablo Robert2-Apr-09 2:20
memberPablo Robert2-Apr-09 2:20 
GeneralRe: My vote of 1 Pin
radumi7-Apr-09 2:24
memberradumi7-Apr-09 2:24 

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