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Use == to compare two string objects

using System; class MainClass {     public static void Main()     {         string test1 = "This is a test string";         string test2, test3;         test2 = test1.Insert(15, "AAA ");         test3 = test1.ToUpper();        Console.WriteLine("test1: '{0}'", test1);         Console.WriteLine("test2: '{0}'", test2);         Console.WriteLine("test3: '{0}'", test3);         if (test1 == test3)             Console.WriteLine("test1 is equal to test3");         else             Console.WriteLine("test1 is not equal to test3");             } } test1: 'This is a test string' test2: 'This is a test AAA string' test3: 'THIS IS A TEST STRING' test1 is not equal to test3