how to enable a textbox for numbers only in asp.net

You can done this in following ways:
AjaxFilteredTextBoxExtender

here you first add reference of ajax toolkit and this extender.
you can set ValidChars to "." for decimal which allo user to enter numeric value with decimal point.
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<ajaxtoolkit:filteredtextboxextender id="ftbe" runat="server" xmlns:ajaxtoolkit="#unknown">
TargetControlID="TextBox3"
FilterType="Numbers"
/>

Hi,

See the below link. It might be help you to find your solution.

http://www.asp.net/ajaxLibrary/AjaxControlToolkitSampleSite/FilteredTextBox/FilteredTextBox.aspx[^]

Set FilterType="Numbers" for enter only numeric values.

Thanks,
Viprat

Friend, use the custom code on KeyPress event of text box... let me know if you required the code for same.
Thanks,
Ambesha

hiii try this


1)

<asp:TextBox ID="txtNumbers" runat="server"/>

   <asp:FilteredTextBoxExtender ID="Numbers"

                runat="server"

                TargetControlID="txtNumbers"

                FilterType="Numbers">

  </asp:FilteredTextBoxExtender>

2)

<script language="javascript" type="text/javascript">
function intOnly(i)
{
if(i.value.length>0)
{
i.value = i.value.replace(/[^\d]+/g, '');
}
}
</script>

<asp:TextBox id="TextBox1" style="Z-INDEX: 102; LEFT: 240px; POSITION: absolute; TOP: 152px" Runat="server" onChange="intOnly(this);" onKeyUp="intOnly(this);" onKeyPress="intOnly(this);"></asp:TextBox>