C# best practices: where possible use string object method IsNullOrWhiteSpace() instead of IsNullOrEmpty()

C# best practices: where possible use string object method IsNullOrWhiteSpace() instead of IsNullOrEmpty().cs

using System;

public class Program
{
    static void Main()
    {
        string[] values = { null, "", "   ", "val"};

        foreach (string value in values)
        {
            // Use string object method IsNullOrWhiteSpace() instead of IsNullOrEmpty().
            Console.WriteLine(string.IsNullOrWhiteSpace(value));
        }
    }
}

// The example displays the following output:
//       True
//       True
//       True
//       False