using System;

public class Program

{

    public static void Main()

    {

        string strA = "";

        // or

        string strB = String.Empty;

        Console.WriteLine(strA.Length); // Prints 0

        Console.WriteLine(strB.Length); // Prints 0

        string strC; // Un-initialized - value null;  

        string strD = null; // Initialized with null

        string strE = "";  // empty string

        string strF = string.Empty; // empty string 

​

​

​

    }

}