using System;

public class Program

{

    public static void Main()

    {

            string s_id = "SomeValue";

            string c_id = null;

            if (!(String.IsNullOrEmpty(s_id)) && (String.IsNullOrEmpty(c_id)))

            {

                //String is null

                Console.WriteLine("s_id is not Null and c_id is null");

            }

            else

            {

                //String is not Null

                Console.WriteLine("String is not Null");

            }

    }

}