using System;

using System.Windows.Forms;



namespace WindowsApplication1

{

    public partial class Form1 : Form

    {

        public Form1()

        {

            InitializeComponent();

        }



        private void button1_Click(object sender, EventArgs e)

        {

            string str = null;

            str = "CSharp TOP 10 BOOKS";

            if (str.Contains("TOP") == true)

            {

                MessageBox.Show("The string Contains() 'TOP' ");

            }

            else

            {

                MessageBox.Show("The String does not Contains() 'TOP'");

            } 

        }

    }

}