<%@ Page Language="C#" AutoEventWireup="true" CodeFile="CS.aspx.cs" Inherits="CS" %>
<!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></title>
<style type="text/css">
body
{
font-family: Arial;
font-size: 10pt;
}
</style>
</head>
<body>
<form id="form1" runat="server">
Enter Number:
<asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>
<asp:CustomValidator ID="CustomValidator1" runat="server" ForeColor="Red" ErrorMessage="Please enter numeric values."
OnServerValidate="Validate_Numeric" ControlToValidate="TextBox1"></asp:CustomValidator>
<br />
<br />
<asp:Button ID="btnSubmit" runat="server" Text="Submit" />
</form>
</body>
</html>
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
public partial class CS : System.Web.UI.Page
{
protected void Validate_Numeric(object sender, ServerValidateEventArgs e)
{
System.Text.RegularExpressions.Regex r = new System.Text.RegularExpressions.Regex("^[0-9]+$");
e.IsValid = r.IsMatch(TextBox1.Text);
}
}
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