using System;

public class Program

{

    public static void Main()

    {

        string cadena1 = "prueba";

        string cadena2 = "PRUEBA";

        if (cadena1.Equals(cadena2))

            Console.WriteLine("Son iguales!");

        else

            Console.WriteLine("Son distintos!");

        if (string.Compare(cadena1, cadena2) == 0)

            Console.WriteLine("Son iguales!");

        else

            Console.WriteLine("Son distintos!");

        if (string.Compare(cadena1, cadena2, true) == 0)

            Console.WriteLine("Son iguales!");

        else

            Console.WriteLine("Son distintos!");

    }

}