Allow only numbers in textbox in asp.net

Satyapriyanayak
Posted by Satyapriyanayak under ASP.NET category on | Points: 40 | Views : 2465
We will know how to 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>

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