DirectoryInfo di = new DirectoryInfo(@"c:\windows\temp");
Here I want to replace c:\ with the current drive on which the user is operating windows. Is it possible to do that?
Both Environment.GetEnvironmentVariable("SystemRoot")
and Environment.GetEnvironmentVariable("windir")
should give you the path in form of "driveLetter:\\Windows"
So you can do:
DirectoryInfo di = new DirectoryInfo(Environment.GetEnvironmentVariable("SystemRoot"));
For the difference between "SystemRoot" and "windir" see: https://superuser.com/questions/638321/what-is-difference-between-windir-and-systemroot