How can we insert only integer no. in textbox.

hey,
using javascript u can do this otherwise use ajax
javscript code--

<pre lang="cs">function onlyNumber(evt) {
if (!(evt.keyCode &gt;= 48 &amp;&amp; evt.keyCode &lt;= 57)
return false;</pre>
and in page load event write following line
txtNumber.Attributes["onkeypress"] = "return onlyNumber(event);";

Best luck

There are a number of ways.
My personally preference would be not to use a TextBox, but to use a NumericUpDown control instead, or possibly a MaskedTextBox.
However, these are only available in WinForms projects, and if you are indeed using ASP then Javascript is your best option. (otherwise you can validate it at the server, but that's a PITA for the user).
There is a javascript solution here: http://www.cambiaresearch.com/articles/39/how-can-i-use-javascript-to-allow-only-numbers-to-be-entered-in-a-textbox[^]

hello there,

you can use this javascript on textbox any event like keyup or keydown :-

function Numeric(Id)
{
If(IsNaN(Id.Value))
{
alert('only Numeric');
}
}