how to use Captcha in asp.net Second post
Use of Captcha in asp.net Second post
In Asp.net Programming Basically the user is shown an image with some characters and user has to fill the same character in a textbox provided, then the content of the image is matched with the textbox and if it matches it ensures that it’s a valid submission and the form gets submitted.
When we want to protect our web page Access by the automatic software or utility program. then we want to insured that that is human which access my page.
<For view the full code Asp.net go to the following link and if you need the download this also.
When we want to protect our web page Access by the automatic software or utility program. then we want to insured that that is human which access my page.
code for .aspx page:
<%@ Page Language="C#" AutoEventWireup="true"
CodeFile="Default.aspx.cs" Inherits="_Default" %>
<%@ Register Assembly="MSCaptcha" Namespace="MSCaptcha"
TagPrefix="cc1" %>
<!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>
<script type="text/javascript"
language="javascript">
function
Check() {
if
(document.getElementById("<%=TxtName.ClientID%>").value.trim()
== "") {
alert("Please
enter Name.");
document.getElementById('<%=TxtName.ClientID%>').focus();
return
false;
}
}
else if
(document.getElementById("<%=Txtweb.ClientID%>").value.trim()
== "") {
alert("Please
enter web Address.");
document.getElementById('<%=Txtweb.ClientID%>').focus();
return
false;
}
return
confirm("Are you sure you want to save?");
}
</script>
</head>
<body>
<form id="form1"
runat="server">
<div>
<table style="width: 100%">
<tr>
<td align="center"
colspan="2">
</td>
</tr>
<tr>
<td align="right"
style="width:50%">
Name :</td>
<td align="left">
<asp:TextBox
ID="TxtName" runat="server"></asp:TextBox>
</td>
</tr>
<tr>
<td align="right">
Web
Address :</td>
<td align="left">
<asp:TextBox
ID="Txtweb" runat="server"></asp:TextBox>
</td>
</tr>
<tr>
<td align="right">
</td>
<td align="left">
<div
class="row">
<label>
</label>
<cc1:captchacontrol
ID="ccJoin" runat="server" CaptchaBackgroundNoise="none"
CaptchaLength="5"
CaptchaHeight="40"
CaptchaWidth="150" CaptchaLineNoise="None" CaptchaMinTimeout="5"
CaptchaMaxTimeout="140"
FontColor="Red" Width="155px" />
<asp:TextBox
ID="txtCaptcha" runat="server" placeholder="Type above
text."></asp:TextBox>
</div>
</td>
</tr>
<tr>
<td align="right">
</td>
<td align="left">
<asp:Button
ID="btnSave" runat="server" class="GWS_btn even" Style="margin-right:
10px;"
OnClientClick="javascript:return
Check();" Text="Submit" OnClick="btnSave_Click" />
<asp:Label
ID="lblMsg" runat="server" Visible="False" ForeColor="Red"
Font-Bold="true"
Font-Size="12px"></asp:Label>
</td>
</tr>
</table>
</div>
</form>
</body>
</html>
Code for .aspx.cs Page :
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
public partial class _Default : System.Web.UI.Page
{
protected void
Page_Load(object sender, EventArgs e)
{
}
protected void
btnSave_Click(object sender, EventArgs e)
{
ccJoin.ValidateCaptcha(txtCaptcha.Text);
if
(!ccJoin.UserValidated)
{
lblMsg.Visible = true;
lblMsg.Text = "Invalid Text. Try Again!";
return; //Inform
user that his input was wrong ...
}
}
}
Code for Web config file .
<?xml version="1.0"?>
<configuration>
<system.web>
<httpHandlers>
<add verb="GET" path="CaptchaImage.axd" type="MSCaptcha.CaptchaImageHandler, MSCaptcha "/>
<add path="ChartImg.axd" verb="GET,HEAD,POST" type="System.Web.UI.DataVisualization.Charting.ChartHttpHandler, System.Web.DataVisualization, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"
validate="false" />
</httpHandlers>
</system.web>
<system.webServer>
<validation validateIntegratedModeConfiguration="false"/>
<handlers>
<add name="MSCaptcha" verb="GET" path="CaptchaImage.axd" type="MSCaptcha.CaptchaImageHandler, MSCaptcha "/>
<remove name="ChartImageHandler" />
<add name="CrystalImageHandler.aspx_GET" verb="GET" path="CrystalImageHandler.aspx"
type="CrystalDecisions.Web.CrystalImageHandler, CrystalDecisions.Web, Version=13.0.2000.0, Culture=neutral, PublicKeyToken=692fbea5521e1304"
preCondition="integratedMode" />
</handlers>
<security>
<requestFiltering>
<requestLimits maxAllowedContentLength="4294967295"/>
</requestFiltering>
</security>
</system.webServer>
</configuration>
For view the full code go to the following link and if you need the download this also.
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Reference :
