enter only digit in textbox

Use this Javascript

<script type="text/javascript" language="javascript">
 function NumericOnly(obj)
        {
                if(obj.value.length>0)
                {
                obj.value = obj.value.replace(/[^\d]+/g, ''); // This would validate the inputs for allowing only numeric chars
                }
        }
    </script>

& call this function in text box as

<asp:TextBox ID="TextBox1" runat="server" ToolTip="Enter Only Numeric" onkeyup="NumericOnly(this);"></asp:TextBox>

Have a look at this...
Check[^]

textbox-to-accept-only-numbers-in-c-windows-forms.aspx[^]

Simplest solution:

<asp:regularexpressionvalidator id="RegularExpressionValidator3" runat="server" errormessage="Enter digits Only" controltovalidate="your textbox id" validationexpression="^[0-9]\d*(\.\d+)?$" xmlns:asp="#unknown">Enter digits only</asp:regularexpressionvalidator>

Regards..:laugh:

use ajax filter textbox extender and set valid character 0-9

function NumericTextBox(input,event)
{

var keyCode = event.which ? event.which : event.keyCode;


if(parseInt(keyCode)>=48 && parseInt(keyCode)<=57)
{
return true;
}
if(parseInt(keyCode)==8 || parseInt(keyCode)==46 || parseInt(keyCode)==9){return true;}
return false;
}

private void textBox1_KeyPress(object sender, KeyPressEventArgs e)
{
e.Handled = !char.IsDigit(e.KeyChar) && !char.IsControl(e.KeyChar);
}