Read and edit PE data with C#

Question

hello everyone,

i now read quite some articels about some sorts of crypting.
now i want to make a crypter that injects a litle pice of code in a crypted.exe and only when the correct password is used the program will decode correctly and run.

i know how to do this by hand,

i need to edit the PE (protable execuatable) headers so it starts my little code first, but now i want to atomate this.

so my question is:


is it possible to  read/edit the PE headers from a C# application?

if not can this be done by useing particalry API's???


i hope someone can awnser this :)