Domain name availability

Did you see this post in the forum above? http://forums.webwiz.net/forum_posts.asp?TID=25815

Hi is there anyone to help me in adding captcha image code in my project.I got the code for captcha image and which is working fine alone and when i add in my project its not checking the captcha image which i enter in the textbox.
    I want to check the code while button click fire up.if it is wrong then it should shows the error message in the label and the value is correct the the values should goes to the table in the database except captcha text..If anyone help me would be appretiated. and here im going to paste the two code 1. captcha code and my registration form code.

1) Default.aspx.cs
using System;
using System.Data;
using System.Configuration;
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;

public partial class _Default : System.Web.UI.Page
{
    // For generating random numbers.
    private Random random = new Random();

    protected void Page_Load(object sender, EventArgs e)
    {
        if (!this.IsPostBack)
        {
            // Create a random code and store it in the Session object.
            this.Session["CaptchaImageText"] = GenerateRandomCode();
        }
    }

    //
    // Returns a string of six random digits.
    //
    private string GenerateRandomCode()
    {
        string s = "";
        for (int i = 0; i < 6; i++)
            s = String.Concat(s, this.random.Next(10).ToString());
        return s;
    }
    protected void SignupButton_Click(object sender, EventArgs e)
    {
        if (!Page.IsValid) return;
        if ((CaptchaTextBox.Text == this.Session["CaptchaImageText"].ToString()) &&
            Page.IsValid)
        {
            // Display an informational message.
            //MessageLabel.CssClass = "info";
            Label1.Text = "Correct!";

            //gpstatusbox here...

            //SaveRecord();
        }
        else
        {
            // Display an error message.
            //MessageLabel.CssClass = "error";
            Label1.Text = "ERROR: Incorrect, try again.";

            ////gpstatusbox here...

            // Clear the input and create a new random code.
            CaptchaTextBox.Text = "";
            this.Session["CaptchaImageText"] = GenerateRandomCode();
        }
        CaptchaTextBox.Text = "";
    }
}


JpegImage.aspx.cs

using System.Drawing.Imaging;
using App_Code;

public partial class JpegImage : System.Web.UI.Page {
    protected void Page_Load(object sender, System.EventArgs e) {
        // Create a CAPTCHA image using the text stored in the Session object.
        CaptchaImage ci = new CaptchaImage(this.Session["CaptchaImageText"].ToString(), 200, 50, "Century Schoolbook");

        // Change the response headers to output a JPEG image.
        this.Response.Clear();
        this.Response.ContentType = "image/jpeg";

        // Write the image to the response stream in JPEG format.
        ci.Image.Save(this.Response.OutputStream, ImageFormat.Jpeg);

        // Dispose of the CAPTCHA image object.
        ci.Dispose();
    }
}

2)User Registration Code to store the values to the datasource-NewReg.aspx.cs

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.Data.SqlClient;
using System.Net.Mail;

public partial class NewReg : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!Page.IsPostBack)
        {
            if (Session["UId"] != null)
            {
                pasRow.Visible = false;
                conpasRow.Visible = false;
                GetUser();
            }
            else
            {
                pasRow.Visible = true;
                conpasRow.Visible = true;
            }
        }
    }
        private void GetUser()
    {
        if (Session["UID"] != null)
        {


            SQLHelper oldUser = new SQLHelper();
            SqlDataReader droldUser = oldUser.ExecuteReader("select * from tbl_Users where ID='" + Session["UID"].ToString() + "'");
            while (droldUser.Read())
            {
                txtFName.Text = droldUser["FirstName"].ToString().Replace("`", "'");
&nb