This is and neat class I've put together that allows you to specify username and password (and optionally a domain) and act under that identity. Primarily to access a shared folder, but you could easily find more areas of use.

   1: using (new Impersonator(true, "username", "password", "123.123.123.123"))

   2: {

   3:     // The new idenity is only active inside this using clause

   4:     if (!Directory.Exists(@"\\123.123.123.123\Foo\bar"))

   5:         Directory.CreateDirectory(@"\\123.123.123.123\Foo\bar");

   6: } 

   7:  

It makes use of the Win32 API "LogonUser".

Download the source code and give it a try!

Impersonator.7z (3.60 kb)