1 void Main()
 2 {
 3     var types = new List<MyType>(new[] {
 4         new MyType(null),
 5         new MyType(5),
 6         new MyType(null),
 7         new MyType(1),
 8         new MyType(99),
 9         new MyType(null)
10     });
11     
12     foreach(var type in types.OrderBy(t => t.Order ?? int.MaxValue)) {
13         Console.WriteLine("Order: {0}", type.Order);
14     }
15 }
16 
17 // Define other methods and classes here
18 class MyType {
19     public int? Order { get; set; }
20     
21     public MyType(int? order) {
22         this.Order = order;
23     }
24 }