Dynamic function selection

I need to dynamicly choose a function to run, I want as much code as possible in the DLL file, so my question is, can you return a variable to a form from a function that would be like MyFunction() in the variable and can you make it execute? Or is there an alternative?

I'd rather not have a huge amount of if statements or select statements because the DLL I want to be seperate from my program, so I can modify it as much as I want, and the program will work with it still.

Check out delegates, that is pretty much what they are; variables that hold functions instead of data.