dynamic MyDynamic = new System.Dynamic.ExpandoObject();
MyDynamic.A = "A";
MyDynamic.B = "B";
MyDynamic.C = "C";
MyDynamic.Number = 12;
MyDynamic.MyMethod = new Func<int>(() =>
{
return 55;
});
Console.WriteLine(MyDynamic.MyMethod());
Read more about ExpandoObject class and for more samples: Represents an object whose members can be dynamically added and removed at run time.