ILASM - #define and .typedef

Two little-known features of ILASM (the IL assembler for .NET) are #define and .typedef which can reduce typing significantly, just as these do in a classic programming language. Often people do "round-tripping", i.e. they write an application in C#, ildasm it, make some slight modification, and ilasm it again. Now, in such a cycle you won't see all of the features of IL, such as #define and .typedef. So, if you're interested in IL, read on.