using System;

using System.Linq;

using System.Xml;                   

using System.Xml.Linq;

using System.Collections; 

using System.Collections.Generic;

​

public class Program

{

    public static void Main()

    {       

        List<Student> students = new List<Student>() {new Student {ID=1, Name="hari", Address="xyz", Phone="880234302" }, new Student {ID=2, Name="prasad", Address="xyz", Phone="880234302" }};

            XElement element = 

        new XElement("Students",

            (from student in students 

                 select new XElement("Student",

                     new XElement("ID", student.ID),

                     new XElement("Name",student.Name),

                     new XElement("Address", student.Address),

                     new XElement("Phone",student.Phone)

                 )

             )

         ); 

        element.Dump();

    }

}

public class Student

{

    public int ID;

    public string Name;

    public string Address;

    public string Phone;

}