How to add and verify captcha codes on 3 tier login and registration page in asp.net applications

Introduction:-
Hi friend, today we will learn "how to add and verify captcha codes on your existing 3 tier login and registration page in asp.net". I have already explained ,how to to create 3 tier login and registration page.But here i will explain "how to add and verify captcha codes in 3 tier login and registration page".If you want to add more features on your registration and login page, you can follow below links.

• Add captcha codes (.dll)on asp.net website easily.
• Add captcha codes(graph)on asp.net website easily
• Add change password codes in this application
• Add forget password codes in this application
• Add cookies concepts in this application
• Add caching concepts in this application
• Add Password hashing concepts in this application
• Add send email concepts in this application
• Add form based authentication concepts in this applications
• You can create complete registration and login page in asp.net
• Add different connection codes in this application

I have alreafy implemented more concepts separately , It is yours responsibility, how to use it in different .NET applications.Here we will learn how to add captcha(.dll) codes in 3 tier architecture.You can add another captcha codes(graph) also in this application.This is easy process but you have to follow some steps as given below:-

Step 1:-First Implement the complete 3 tier architecture concepts from step 1 to step 14  on your visual studio from Here . You can download whole 3 tier architecture codes .
Step 2:- You can download captcha.dll file from here.
Step 3:- Now open Solution Explorer --> Add New Folder Bin  --> Extract captcha dll files and paste it into Bin folder as shown below:-

Step 4:- Now  open Home.aspx file--> Go Source file--> Add Register Assembly codes on the top section as given below:-

<%@ Register Assembly="MSCaptcha" Namespace="MSCaptcha" TagPrefix="rsv" %> 

Step 5:- Now Add Captcha codes  inside table tag (<tb>)as shown below:-

<td class="style3">
                <rsv:CaptchaControl ID="captcha1" runat ="server" CaptchaLength="5" 
                CaptchaHeight ="60" CaptchaWidth="200" CaptchaLineNoise="None" 
                CaptchaMinTimeout="5" CaptchaMaxTimeout="240" ForeColor="#00FFCC" 
                BackColor="White" CaptchaChars="ABCDEFGHIJKLNPQRTUVXYZabcdefghijklmnopqrstuvwxyz012346789" 
                FontColor="Red" />
                </td>

 

Step 6:- After adding step 4 and step 5 codes ,you will see following image on your design page as shown below:-

Step 7:-Now open web.config file-->Write the following codes as given below:-

<configuration><system.web>
    <httpHandlers>
      <add verb="GET" path="CaptchaImage.axd" type="MSCaptcha.CaptchaImageHandler, MSCaptcha "/>
    </httpHandlers>
    <compilation debug="true" targetFramework="4.0">
    <assemblies>
    <add assembly="System.Data.Entity, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089"/></assemblies></compilation>
 </system.web>
</configuration>

Note:- Above codes is more important to show the captcha codes on the web page.
Step 8:- Now Go  inside Register Now (Home.aspx.cs) button-->Update the c# codes as given below:-

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

public partial class Home : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {

    }
    protected void Button1_Click(object sender, EventArgs e)
    {
        captcha1.ValidateCaptcha(TextBox7.Text.Trim());
        if (captcha1.UserValidated)
        {
            //Load or call Business object class in memory and get and set the value in variables
            Business_Object bo = new Business_Object();
            bo.Username_value = TextBox1.Text;
            bo.pass_value = TextBox2.Text;
            bo.Qualification_value = TextBox4.Text;
            bo.Age_value = TextBox5.Text;
            bo.mobile_value = TextBox6.Text;
            //call business layer class by creating object of business layer class
            Business_Layer bl = new Business_Layer();

            try
            {
                string result = bl.record_insert(bo);
                if (result != null)
                {
                    Response.Redirect("login.aspx");
                    //Label1.Text = "Data successfully inserted in database";
                }
                else
                {
                    Label1.Text = "Try again...";
                }
            }

            catch (Exception info)
            {
                throw info;
            }
            finally
            {
                bo = null;
                bl = null;
            }
        }
        else
        {
            Label2.ForeColor = System.Drawing.Color.Red;
            Label2.Text = "You have Entered InValid Captcha Codes";
        }
    }
}

Note :-When are making any application,please change the all control (Tex box ,label etc.) ID like Ex. TextBox1.Text =txtname.text for security purpose.I am using it just understanding purpose only.
Step 9:-Now run the application(press F5)-->Fill  all Details  as show below:-

Step 10:-Press Register Now Button-->You will see following output as shown below:-

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