How to patch .NET DLLs?

[taos]

In hXXp://msdn.microsoft.com/library/default.asp?url=/library/en-us/cptools/html/cpconmsildisassemblerildasmexe.asp
you can read this:
"The text file produced by Ildasm.exe can be used as input to the MSIL Assembler (Ilasm.exe)."
Then,you must remove .publickey and .hash entries from disassembly and use ILASM.EXE like omega_red says. Don't use IDA or HIEW, use ILASM/ILDASM.

you can donwload .net sdk here:
hxxp://www.microsoft.com/downloads/details.aspx?familyid=9B3A2CA6-3647-4070-9F41-A333C6B9181D&displaylang=en
or here 2.0 beta:
hxxp://www.microsoft.com/downloads/details.aspx?FamilyID=916ec067-8bdc-4737-9430-6cec9667655c&DisplayLang=en

here you can understand how to use ILDASM with the famous HELLO WORLD example.
hxxp://www.c-sharpcorner.com/vsnet/IldasmTool.asp

Regards