How to present credentials in order to open file?

Question

How do I specify the username and password in order for my program to open a file for reading? The program that needs to access the file is running from an account that does

Answer 1

You want to impersonate a user who does have the rights to access the file.

I recommend using a class like this - http://www.codeproject.com/KB/cs/zetaimpersonator.aspx. It hides all the nasty implementation of doing impersonation.

using (new Impersonator("myUsername", "myDomainname", "myPassword"))
{
  string fileText = File.ReadAllText("c:\test.txt");
  Console.WriteLine(fileText);
}