In C++, I can easily get the hex value for WM_MOUSEMOVE or WM_PAINT by right-clicking and choosing "Go to Defintion."  But, I cannot do that in VB.Net or C#.  Usually, I find the value by querying www.pinvoke.net, but now I have found that using Reflector I can get the values.

Simply, open Reflector and look at the System.Design.NativeMethods and System.Windows.Forms.NativeMethods classes to get a list of the message names and their values.