Great guesses on my recent quiz...   Here are the answers... Now a question for you -- any theories on why this APIs are so popular? 

1,System.Type.GetTypeFromHandle(System.RuntimeTypeHandle handle),15399
2,System.Byte[,,].Set(Int32 ,Int32 ,Int32 ,Byte ),13122
3,System.IDisposable.Dispose(),3488
4,System.Resources.ResourceManager.GetObject(System.String name),2845
5,System.Byte[,].Set(Int32 ,Int32 ,Byte ),2692
6,System.Text.StringBuilder.Append(System.String value),2588
7,System.Collections.ArrayList.get_Count(),2229
8,System.Collections.IEnumerator.MoveNext(),2158
9,System.Collections.IEnumerator.get_Current(),2083
10,System.Collections.ArrayList.Add(System.Object value),2049