using System;
class Program
{
static void Main() {
bool b = string.IsNullOrWhiteSpace(" ");
Console.WriteLine(b);
b = string.IsNullOrWhiteSpace(null);
Console.WriteLine(b);
b = string.IsNullOrWhiteSpace("");
Console.WriteLine(b);
b = string.IsNullOrWhiteSpace(string.Empty);
Console.WriteLine(b);
b = string.IsNullOrWhiteSpace("\n");
Console.WriteLine(b);
b = string.IsNullOrWhiteSpace("\r");
Console.WriteLine(b);
b = string.IsNullOrWhiteSpace("\r\n");
Console.WriteLine(b);
b = string.IsNullOrWhiteSpace("\v");
Console.WriteLine(b);
b = string.IsNullOrWhiteSpace("c#");
Console.WriteLine(b);
}
}
/*
run:
True
True
True
True
True
True
True
True
False
*/
