publish windows visual studio express (c#) to run on a mac help please

Hello,

I have built a very simple sample application using VS 2010 c# express (just a button and a label on a form).

I want to be able to run this on a MAC as well as windows.

Any suggestions would be great, i have done a lot of Googling and found Monodevelop however, i cant see an option to create a setup file for my project that will run on a mac... seen an area where you can create a package but no option for MAC (just windows or linux) and not even sure if "create package" is the correct route to take.

Any help on this? are there any other options to make my windows app available to run on a mac? or any help using Monodevelop to publish my setup files for a mac

Thanks in advance