using System.Diagnostics;
public static void Main()
Stopwatch w1 = new Stopwatch();
Console.WriteLine("s1 == s2: {0}", s1 == s2);
Console.WriteLine("s1 == s2 time: {0}", w1.Elapsed);
Console.WriteLine(string.Empty);
Console.WriteLine("string.Equals(s1, s2): {0}", string.Equals(s1, s2));
Console.WriteLine("string.Equals(s1, s2) time: {0}", w1.Elapsed);
Console.WriteLine(string.Empty);
Console.WriteLine("string.IsNullOrEmpty(s1) && string.IsNullOrEmpty(s2) && string.Equals(s1, s2): {0}",string.IsNullOrEmpty(s1) && string.IsNullOrEmpty(s2) && string.Equals(s1, s2));
Console.WriteLine("string.IsNullOrEmpty(s1) && string.IsNullOrEmpty(s2) && string.Equals(s1, s2) time: {0}", w1.Elapsed);