how to use text and numeric validation to textbox

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I created a windows form in c# ,in that for textbox I want to apply validation i.e Only to enter the text or to enter only numeric values.
please help me in this.

Thanks in Advance.

Posted 18-May-11 22:24pm

suvaaj

Updated 20-May-11 2:33am

Ramalinga Koushik

v5

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ZeeroC00l 19-May-11 4:42am

--edited for format and grammar
BR//
Harsha

3 solutions

Solution 1

Firt the tag you've used in confusing. Are you talking about winforms or ASP.Net as you say C# and JavaScript.
If you are looking for ASP.Net validations, see here[^].

Posted 18-May-11 22:29pm

Abhinav S

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Sergey Alexandrovich Kryukov 19-May-11 13:47pm

If it's numeric-only, it should practically always filtering, not validation, and only in Javascript. Validation can be added at the server side as well. OP needs the tag ASP.NET.

I explain it in my answer, please see.

Wonde Tadesse 20-May-11 8:55am

Please see --SA answer. It is not only validation,it has to be filtered except numbers.

Solution 4

In keypress event check each key with char.IsDigit and decide what to do.

Posted 20-May-11 2:39am

Chil Umez

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Sergey Alexandrovich Kryukov · Accepted Answer · 2011-05-19T07:46:00

That's good you mention Javascript. It's the best to do it on the client side, as the events you have to consume are too frequent.

Here is how:

HTML

<html>
   <head>
      <script type="text/javascript"><!--
         function filterDigits(eventInstance) { 
            eventInstance = eventInstance || window.event;
                key = eventInstance.keyCode || eventInstance.which;
            if ((47 < key) && (key < 58) || key = 45 || key == 8) {
               return true;
            } else {
                    if (eventInstance.preventDefault) eventInstance.preventDefault();
                    eventInstance.returnValue = false;
                    return false;
                } //if
         } //filterDigits
      --></script>
   </head>
<body">

<input type="text" onkeypress="filterDigits(event)"/>

</body>
</html>

Pay attention that backspace is also allowed. By some historical reasons backspace is considered a character and should be allowed anyway.

—SA