using System;

#nullable enable

public class Program

{

    public static String getName() {

        return null;

    }

​

    public static void Main()

    {

        string firstName = getName();

        String res;

        try {

            res = (firstName == "").ToString();

        }

        catch (Exception e) {

            res = e.Message;

        }

        Console.WriteLine("firstName == \"\": "+res);

        try {

            res = ("" == firstName).ToString();

        }

        catch (Exception e) {

            res = e.Message;

        }

        Console.WriteLine("\"\" ==  firstName: "+res);

​

        try {

            res = "".Equals(firstName).ToString();

        }

        catch (Exception e) {

            res = e.Message;

        }

        Console.WriteLine("\"\".Equals(firstName): "+res);

        try {

            res = (firstName.Length == 0).ToString();

        }

        catch (Exception e) {

            res = e.Message;

        }

        Console.WriteLine("firstName.Length == 0: "+res);

​

            try {

            res = firstName.Equals("").ToString();

        }

        catch (Exception e) {

            res = e.Message;

        }

        Console.WriteLine("firstName.Equals(\"\"): "+res);

}

}