In this blog we will know, allow only numbers in textbox in
asp.net.
Method-1
<%@ Page Language="C#"
AutoEventWireup="true" CodeBehind="Default.aspx.cs"
Inherits="Enter_only_numbers_in_textbox._Default" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0
Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>Untitled Page</title>
<script
type="text/javascript" language="javascript">
function
numeric(evt)
{
var charCode =
(evt.which) ? evt.which : event.keyCode
if(charCode > 31
&& ((charCode >= 48 && charCode <= 57) || charCode ==
46))
return true;
else
{
alert('Please
Enter Numeric values.');
return false;
}
}
</script>
</head>
<body>
<form
id="form1" runat="server">
<div>
<asp:TextBox
ID="TextBox1" runat="server" onkeypress="return
numeric(event)"></asp:TextBox>
</div>
</form>
</body>
</html>
Method-2
<%@ Page Language="C#"
AutoEventWireup="true" CodeBehind="WebForm1.aspx.cs"
Inherits="Enter_only_numbers_in_textbox.WebForm1" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0
Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>Untitled Page</title>
<script
type="text/javascript" language="javascript">
function numeric(
e )
{
var unicode =
e.charCode ? e.charCode : e.keyCode;
if( unicode == 8
|| unicode == 9 || ( unicode >= 48 && unicode <= 57 ) )
{
return true;
}
else
{
return false;
}
}
</script>
</head>
<body>
<form
id="form1" runat="server">
<div>
<input
type="text" name="textbox1" id="textbox1"
onkeypress="return numeric(event);" />
</div>
</form>
</body>
</html>