Access Autonumber field and OleDbDataReader

[brd24gor]

I keep getting an invalid cast exception when trying to retrieve data from an AutoNumber field in Access. Here is what I have:

		private int GetSessionNumber()
		{
			//Check database connection.  If closed, open it
			if (aLib.SQLConnection.State==System.Data.ConnectionState.Closed)
				aLib.SQLConnection.Open();

			string sql = "SELECT MAX(Session_ID) As S FROM User_Tests " + 
				"WHERE Test_ID = '" + testID + "' AND User_ID = '" + taker.UserID + "'";
			OleDbCommand getSession = new OleDbCommand(sql,aLib.SQLConnection);
			OleDbDataReader sessionReader = getSession.ExecuteReader();
			sessionReader.Read();
			int session = sessionReader.GetInt32(0); //Invalid Cast
			MessageBox.Show(Convert.ToString(session));
			sessionReader.Close();
			return(session);
		}

My problem is occuring on this line:

sessionReader.GetInt32(0); //Invalid Cast

I have the AutoNumber column setup as a Long Integer in Access. Is there something about the AutoNumber type that I need to know to be able to use a DataReader on it?

Thanks,
Brad