Cryptography issues

I have been having big problems with the .NET cryptography package, the first was that I was using "Zeros" for padding, which is broken for .NET release 1. Most of the issues have been padding realated, when i was using CBC (Cipher Block Chaining) mode the decryptor (using a different instance of the encryption algorithm) could not strip the padding off again. I am now using ECB (Electric Code Book), a shame but then this is only a prototype.