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;

            string retString = null;

            str = "This is substring test";

            retString = str.Substring(8, 9);

            MessageBox.Show(retString); 

        }

    }

}