How to use C# string Compare

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 str1 = null;
            string str2 = null;

            str1 = "csharp";
            str2 = "CSharp";

            int result = 0;

            result = string.Compare(str1, str2);
            MessageBox.Show(result.ToString());

            result = string.Compare(str1, str2, true);
            MessageBox.Show(result.ToString());
        }
    }
}

When you run this C# program first u will get -1 in message box and then 0