64 bit application requirements

Question

Hello guys
  i have a developed a C# desktop application in MS visual c# express edition 2008 and SQL express 2005. I have done development on a 32 bit system and published the work to a web server, from where the users can install application to the system.
I want to make this work in 64bit system also. Is there any additional work that I should do in the current software for working in 64 bit environment?

Thanks and regards
Hari