creating a directory

I am trying to make a sort of patching system. I need to create a directory at runtime using a script. I have tried:

System.IO.CreateDirectory(path);

and

var newFolder = new System.IO.File(path); newFolder.mkdir()

anyone got any other suggestions?

System.IO.Directory.CreateDirectory(path)

works for android?
I try and I can not!
or someone can tell me how to create a directory in android?