1    public abstract class MyObject: IComparable<MyObject>
2    {       
3        public Int64 sortnumber { get; set; }
4
5        /// <summary>
6        /// Compare two objects
7        /// </summary>
8        /// <param name="other">The objects to be compared with.</param>
9        /// <returns>
10        /// A 32-Bit Signed Integer that states the relative sortorder of the two objects
11        /// </returns>
12        public int CompareTo(MyObject other)
13        {
14            return this.sortnumber.CompareTo(other.sortnumber);
15        }
16    }

List list = new List;
list.add(new MyObject() { sortnumber = 3 });
list.add(new MyObject() { sortnumber = 1 });
list.add(new MyObject() { sortnumber = 2 });
list.Sort(); // will sort the list for the sortnumber