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Creating Windows Folders using impersonation
//set the cursor

string activeDir = "\\department\shares\users\";

//create directory with userID as the folder name

string newPath = System.IO.Path.Combine(activeDir + userID);

System.IO.Directory.CreateDirectory(newPath);

using (var impersonation = new ImpersonatedUser(decryptedUser, decryptedDomain, decryptedPassword))
{
  Directory.CreateDirectory(newPath);
}

public class WNet
{
    public static void AddConnection(string resource, string username, string password)
    {
        NETRESOURCE nr = new NETRESOURCE();
        nr.RemoteName = resource;
        uint err = WNetAddConnection2W(ref nr, password, username, 0);
        if (err != 0)
            throw new RemoteDirectoryException(string.Format("WNetAddConnection2 failed with error: #{0}", err));
    }

    private struct NETRESOURCE
    {
        public uint Scope;
        public uint Type;
        public uint DisplayType;
        public uint Usage;
        public string LocalName;
        public string RemoteName;
        public string Comment;
        public string Provider;
    }

    [DllImport("mpr.dll", CharSet = CharSet.Unicode)]
    private extern static uint WNetAddConnection2W(ref NETRESOURCE lpNetResource, string lpPassword, string lpUsername, uint dwFlags);
}

string activeDir = "\\department\shares\users\";
string username = "username";
string password = "password";

WNet.AddConnection(activeDir, username, password);

string newPath = System.IO.Path.Combine(activeDir, userID);
System.IO.Directory.CreateDirectory(newPath);