List<SomeClass>() a;
List<SomeClass> b = a.OrderBy(x => x.x).ThenBy(x => x.y).ToList();

public class Employee : IComparable<Employee>
{
    private int id;
    private string EmpName;
    private Int Age;

    public static Comparison<Employee> AgeComparison = delegate(Employee e1, Employee e2)
                                                        {
                                                            return e1.Age.CompareTo(e2.Age);
                                                        };

    public static Comparison<Employee> IDComparison = delegate(Employee e1, Employee e2)
                                                     {
                                                         return e1.id.CompareTo(e2.id);
                                                     };

    public int EmployeeID
    {
        get { return id; }
        set { id = value; }
    }

    public string EmployeeName
    {
        get { return EmpName; }
        set { EmpName = value; }
    }

    public Int UnitAge
    {
        get { return Age; }
        set { Age = value; }
    }

    public Employee(int id, string EmpName, Int Age)
    {
        this.id = id;
        this.EmpName = EmpName;
        this.Age = Age;
    }


    public int CompareTo(Employee other)
    {
        return EmployeeName.CompareTo(other.EmployeeName);
    }


    public override string ToString()
    {
        return string.Format("Id: {0} Name: {1} Age: {2}", id, EmpName, Age);
    }
}