xml error(serialization)

Question

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

using System.IO;

using System.Xml;

using System.Xml.Serialization;

namespace SimpleXMLSerialize

{

    public class Employee

    {

        public int EID { get; set; }

        public string EName { get; set; }

        public string Designation { get; set; }

        public long Phone { get; set; }

    }

    public class SXML

    {

        public static void Main(string[] args)

        {

            List<Employee> Emplist = new List<Employee>();

            Employee emp1 = new Employee();

            emp1.EID = 1;

            emp1.EName = "Naveen";

            emp1.Designation = "QA";

            emp1.Phone = 9895356522;

            Employee emp2 = new Employee();

            emp2.EID = 2;

            emp2.EName = "Balu";

            emp2.Designation = "Software Developer";

            emp2.Phone = 9232546554;

            Emplist.Add(emp1);

            Emplist.Add(emp2);

            Serialize(Emplist);==============>> ERROR

 

        }

        public void Serialize(List<Employee> list)

        {

            XmlSerializer xmlser = new XmlSerializer(typeof(List<Employee>));

            using (StreamWriter stmw = new StreamWriter(@"D:\sxml.xml"))

            {

                xmlser.Serialize(stmw, list);

            }

        }

    }

I tried for SERIALIZE buit I got error in this line  )serialize(emplist)
Error Shows:object reference is required for non static fileds,method or property

}