How to Add a Captcha Image in ASP.NET Application

There are some steps to Add Captcha image in Asp.NET Application. You can download whole application from below link.You can easily add this captcha image to your Asp.Net Application Without facing any problem. You can add another captcha code also in any asp.net application from here.Both captcha codes will be provided full security to your asp.net application. Please follow these  steps one by one which are given below.

Step1:- First create ASP.NET page (Default.aspx) in visual studio 2010--> Now click the below link to download the captcha.dll file.

see captcha.dll file:-

Download

Step2:-Now Open Solution Explorer -->Add new Folder(Bin)->open the captcha.dll file->copy all the file -> Now paste it in the Bin Folder.

see it:-

Step3:- Now Write the code for captcha control in Source file as shown below:

see it:-

Step4:-  Now Drag and Drop Text-box,Button, Label and Validation controls on Default.aspx page from the Toolbox.which is as shown below:-
see it:-

Step5:- Now Double click on Button control(Verify) and write the following code.

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 Button1_Click(object sender, EventArgs e)
    {
        captcha1.ValidateCaptcha(TextBox2.Text.Trim());
        if (captcha1.UserValidated)
        {
          Label1.ForeColor = System.Drawing.Color.Green;
          Label1.Text = "You have Entered Valid Captcha Characters";
        }
        else
        {
            Label1.ForeColor = System.Drawing.Color.Red;
            Label1.Text = "You have Entered InValid Captcha Characters please Enter again";
        }
    }
}

see it:-

Step6:- Now open the web.config file and write the following codes as shown below.
see it:-

Step7:- Run the Application (press F5).
see it:
OUTPUT:-

• when we Enter the  correct captcha image In the  Text-Box and click Verify Button,then we see following output:-

• when we Enter the Incorrect captcha image In the  Text-Box and Click Verify Button,then we see following output :

Step8:-If you want to run this whole web application directly on your visual studio then follow below steps which are given below:-

•  First Download this whole application from bottom and Extract it-->Copy this whole file (cltr+c).
•  Now open your visual studio --> File --.New --.website -->Select ASP.NET Empty website -->OK -->Now open Solution Explorer -->Right click on project -->Paste this whole application which you have copied previously. 
• Now Run the application-->then you can run this application successfully.
• If you are facing problem-->Download captcha.dll file from step 1 --> Extract it and copy all dll files -->open solution explorer -->Past this dll file in bin Folder.
• Now again run (press F5) then it will definitely work.

Please share this application with your friends so that it may helpful to others also.If any problem ask frequently.I will solve your doubt definitely.

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I hope this helpful for you.

 Download whole attached application.
         DOWNLOAD