using System;

​

​

​

public class Program

{

    public static void Main()

    {

        bool ignoreCase = true;

        Console.WriteLine("when ignoreCase is {0}",ignoreCase);

        string s1 = "HI";

        string s2 = "hi";

        if (String.Compare(s1, s2,ignoreCase)==0)

            Console.WriteLine("{0} equals {1}",s1,s2);

            else

            Console.WriteLine("{0} not equals {1}",s1,s2);

    }

}