How Can I Exit From The Application If Three Attemts Of Login Is Failed

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C#

C#4.0

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Configuration;
using System.Data.SqlClient;
using System.Reflection;
using System.Data.Sql;
using System.Runtime.CompilerServices;
using System.Runtime.InteropServices;

namespace Cloths_Inventory
{
public partial class frmLogin : Form
{


public frmLogin()
{
InitializeComponent();
}

private void btnOK_Click(object sender, EventArgs e)
{
if (cmbUsertype.Text == "")
{
MessageBox.Show("Please select user type", "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
cmbUsertype.Focus();
return;
}
if (txtUserName.Text == "")
{
MessageBox.Show("Please enter user name", "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
txtUserName.Focus();
return;
}
if (txtPassword.Text == "")
{
MessageBox.Show("Please enter password", "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
txtPassword.Focus();
return;
}


try
{
SqlConnection myConnection = default(SqlConnection);
myConnection = new SqlConnection("Data Source=.\\SqlExpress; Integrated Security=True; AttachDbFilename=|DataDirectory|\\Garment.mdf; User Instance=true;");

SqlCommand myCommand = default(SqlCommand);

myCommand = new SqlCommand("SELECT UserName,User_Password,Role FROM Users WHERE Role = @usertype AND UserName = @username AND User_Password = @UserPassword", myConnection);
SqlParameter uType = new SqlParameter("@usertype", SqlDbType.NVarChar);

SqlParameter uName = new SqlParameter("@username", SqlDbType.NVarChar);

SqlParameter uPassword = new SqlParameter("@UserPassword", SqlDbType.NVarChar);

uType.Value = cmbUsertype.Text;
uName.Value = txtUserName.Text;
uPassword.Value = txtPassword.Text;

myCommand.Parameters.Add(uType);
myCommand.Parameters.Add(uName);
myCommand.Parameters.Add(uPassword);

myCommand.Connection.Open();

SqlDataReader myReader = myCommand.ExecuteReader(CommandBehavior.CloseConnection);

if (myReader.Read() == true)
{


int i;
ProgressBar1.Visible = true;
ProgressBar1.Maximum = 5000;
ProgressBar1.Minimum = 0;
ProgressBar1.Value = 4;
ProgressBar1.Step = 1;

for (i = 0; i <= 5000; i++)
{
ProgressBar1.PerformStep();
}
this.Hide();
frmMainMenu frm = new frmMainMenu();
frm.lblUser.Text = txtUserName.Text;
//frm.UserType.Text = cmbUsertype.Text;
AssemblyCompanyAttribute acb = new AssemblyCompanyAttribute(CompanyName);
frm.lblCompany.Text = acb.Company;
frm.Show();
//The following is user defined call for method disable
//ignore the green highlight

if (cmbUsertype.SelectedItem == "Manager") frm.disable();
if (cmbUsertype.SelectedItem == "Employee") frm.disable1();

}


else
{
MessageBox.Show("Login is Failed...Try again !", "Login Denied", MessageBoxButtons.OK, MessageBoxIcon.Error);

txtUserName.Clear();
txtPassword.Clear();
txtUserName.Focus();

}
if (myConnection.State == ConnectionState.Open)
{
myConnection.Dispose();
}



}
catch (Exception ex)
{
MessageBox.Show(ex.Message, "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
}
}

private void Form_1(object sender, EventArgs e)
{
ProgressBar1.Visible = false;
cmbUsertype.Focus();
}

private void btnCancel_Click(object sender, EventArgs e)
{
Close();
}

private void Form1_FormClosing(object sender, FormClosingEventArgs e)
{
return;
}

private void linkLabel1_LinkClicked(object sender, LinkLabelLinkClickedEventArgs e)
{
this.Hide();
frmChangePassword frm = new frmChangePassword();
frm.Show();
frm.txtUserName.Text = "";
frm.txtNewPassword.Text = "";
frm.txtOldPassword.Text = "";
frm.txtConfirmPassword.Text = "";
}

private void linkLabel3_LinkClicked(object sender, LinkLabelLinkClickedEventArgs e)
{
this.Hide();
frmRecoveryPassword frm = new frmRecoveryPassword();
frm.txtEmail.Focus();
frm.Show();
}

}

}