How to allow only AlphaNumarics And UnderScore Symbol in TextBox in Windows Forms

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i am doing the application in windows forms..
i need the following requirement in the textbox

In my TextBox i want to allow only numbers and chars and UnderScore Spl Symbol only..
remaning all spl symbols i want to restrict in windows Forms..

How i can do this?..

If u know help me..

Thanks & Regrads
Honey

Posted 12-Oct-11 1:43am

honey4bee

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Madhav Hatwalne · Answer 1 · 2011-10-12T01:50:00

Solution 1

You can add regular expressions
http://msdn.microsoft.com/en-us/library/ms229603.aspx[^]

Posted 12-Oct-11 1:50am

Madhav Hatwalne

sravani.v · Answer 2 · 2011-10-12T01:54:00

Solution 2

Try this one

C#

function Alpha()

{

var key=window.event.keyCode;

if

((key > 64 && key < 91)||(key > 96 && key < 123)||(key > 47 && key < 58)||(key==95))

return;

else

window.event.returnValue=null;

}

Posted 12-Oct-11 1:54am

sravani.v

Comments

honey4bee 13-Oct-11 2:17am

Hi Simple,
in "var key=window.event.keyCode;" when i am typing that "window" is not showing in intelligency..
can i add any namespace for that?