Abstract Vs. Static

Can you create abstract function as Static?
A static member cannot be marked as override, virtual, or abstract.

Can you create static function in Abstract class?
Yes.

Example: 

namespace ConsoleApplication2

{

    public abstract class ps

    {

        public ps()

        {

        }

        public ps(string a)

        {

        }

        public abstract string getMessage();

        public static void Helloworld() { Console.WriteLine("hello"); }

         //A static member cannot be marked as override, virtual, or abstract

        //public static abstract void Helloworld() { Console.WriteLine("hello"); }

        //public static abstract string GetName();

    }

    public class Program :ps

    {

        static void Main(string[] args)

        {

            Program p = new Program();

            Console.WriteLine(p.getMessage());

            Helloworld();

            Console.Read();

        }

        public override string getMessage()

        {

            return "message hello.";

        }

    }

}

Is it required to override all abstract function in derived class?

Yes