کد زیر را امتحان کنید ببینید مثلا لیست فایلها رو بهتون میده یا نه
            NetworkCredential credential = new NetworkCredential("Username", "Password" , "Domain");
CredentialCache credentialCache = new CredentialCache();
credentialCache.Add(new Uri(@"\\ComputerNameOrIpAddress"), "Basic", credential);
//then do whatever, such as getting a list of folders:
// example ...
string[] files = System.IO.Directory.GetFiles(@"\\ComputerNameOrIpA ddress\SharedFolderName");