public static void Main()
Console.WriteLine(string.IsNullOrWhiteSpace("\t"));
Console.WriteLine(string.IsNullOrEmpty("\t"));
Console.WriteLine(string.IsNullOrWhiteSpace(" "));
Console.WriteLine(string.IsNullOrEmpty(" "));
Console.WriteLine(string.IsNullOrWhiteSpace("\n"));
Console.WriteLine(string.IsNullOrEmpty("\n"));