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Simple Captcha with ASP.Net
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_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 id="Head1" runat="server">
<title></title>
<script type="text/javascript" language="javascript">
var a = 49, b = 65;
var c = 100;
var d = 70;
function show()
{
if (a == 57) {
a = 49;
}
var main = document.getElementById('txt1');
var a1 = String.fromCharCode(a);
var b1 = String.fromCharCode(b);
var c1 = String.fromCharCode(c);
var d1 = String.fromCharCode(d);
main.value = a1 + b1 + c1 + d1;
a = a + 1;
b = b + 2;
c = c + 1;
d = d + 2;
}
</script>
<style type="text/css">
#form1
{
height: 95px;
}
</style>
</head>
<body>
<form id="form1" runat="server">
<div>
<input type="text" id="txt1" runat="server" style="border-style: none; border-color: inherit;
border-width: medium; background-color: Green; color: red; font-family: 'Curlz MT
font-size: x-large; font-weight: bold; font-variant: normal; letter-spacing: 10pt;
width: 120px; background-image: url('glitter_background_b4.gif');" value="5AbD" />
<input type="button" onclick="show()" value="Change" />
</div>
<asp:TextBox ID="txtverification" runat="server"></asp:TextBox>
<asp:Button ID="Button1" runat="server" Text="Verification" OnClick="Button1_Click" />
<asp:Label ID="lblmsg" runat="server" Font-Bold="True" ForeColor="Red"></asp:Label>
<div>
<asp:CustomValidator ID="CustomValidator2" runat="server" ControlToValidate="txtVerify"
ErrorMessage="You have Entered a Wrong Verification Code!Please Re-enter!!!" OnServerValidate="CAPTCHAValidate"></asp:CustomValidator>
<asp:Image ID="imCaptcha" ImageUrl="" runat="server" />
<asp:TextBox ID="txtVerify" runat="server"></asp:TextBox>
<asp:Button ID="btnSave" runat="server" Text="Save" /></div>
</form>
</body>
</html>
using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Drawing;
public partial class _Default : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
}
protected void Button1_Click(object sender, EventArgs e)
{
if (txtverification.Text == txt1.Value)
{
lblmsg.Text = "Correct";
}
else
{
lblmsg.Text = "Incorrect Code";
}
}
}
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