C# String IsNullOrEmpty()

public static bool IsNullOrEmpty(String str)

    using System; 
    public class StringExample  
    {  
        public static void Main(string[] args)  
        {  
           string s1 = "Hello C#";
           string s2 = "";
           bool b1 = string.IsNullOrEmpty(s1);
           bool b2 = string.IsNullOrEmpty(s2);
           Console.WriteLine(b1);
           Console.WriteLine(b2);
         }  
    }  

 false
True