C# | IsNullOrWhiteSpace() Method

// C# program to illustrate 
// IsNullOrWhiteSpace() Method
using System;
class Geeks {
  
    // Main Method
    public static void Main(string[] args)
    {
        string s1 = null;
        // for null value always return true
        bool b1 = String.IsNullOrWhiteSpace(s1);
        Console.WriteLine(b1);
        string s2 = " ";
        // for whitespace value always return true
        bool b2 = String.IsNullOrWhiteSpace(s2);
        Console.WriteLine(b2);
        string s4 = " \n ";
        // for new line value return true
        bool b4 = String.IsNullOrWhiteSpace(s4);
        Console.WriteLine(b4);
        string s5 = "\t";
        // for tab value return true
        bool b5 = String.IsNullOrWhiteSpace(s5);
        Console.WriteLine(b5);
        string s6 = "\r";
        // for carriage Return value return true
        bool b6 = String.IsNullOrWhiteSpace(s6);
        Console.WriteLine(b6);
        string s7 = "GFG";
        // for s7 it return False
        bool b7 = String.IsNullOrWhiteSpace(s7);
        Console.WriteLine(b7);
    }
}

// C# program to illustrate the 
// similar code for IsNullOrWhiteSpace()
using System;
class Geeks {
    // similar code to 
    // IsNullOrWhiteSpace()
    public static bool check(string str)
    {
        return(String.IsNullOrEmpty(str) || 
              str.Trim().Length == 0) ? true : false;
    }
    // Main Method
    public static void Main(string[] args)
    {
        string s1 = "GeeksforGeeks";
        string s2 = " "; 
        string s3 = null;
        string s4 = " \n ";
        bool b1 = check(s1);
        bool b2 = check(s2);
        bool b3 = check(s3);
        bool b4 = check(s4);
        // To display result
        Console.WriteLine(b1);
        Console.WriteLine(b2);
        Console.WriteLine(b3);
        Console.WriteLine(b4);
    }
}