Empty string vs null string

string is a reference type therefore we can assign null to string variable.


using System;

class Sample
{
    public static void Main()
    {

      string s = null;

    }
}

Empty string is a string with no characters.

The length of an empty string is 0.

Empty string is not nullstring.


using System;

class Sample
{
    public static void Main()
    {

      string s = "";
      Console.WriteLine(s.Length);
    }
}

The output:

From the code above we can see that the length of a empty string is 0.

We cannot check the Length property on an empty string.


using System;

class Sample
{
    public static void Main()
    {

      string s = null;
      Console.WriteLine(s.Length);
    }
}

The output:


Unhandled Exception: System.NullReferenceException: Object reference not set to
an instance of an object.
   at Sample.Main()

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