public bool checkLogin(string login, string password) { Database.Database_DAO.Database db = new Database.Database_DAO.Database(); db.Connect(); SqlCommand command = db.CreateCommand(SQL_SELECT_LOGIN); command.Parameters.AddWithValue("@login", login); SqlDataReader reader = db.Select(command); Collection <Database.Client> Clients = Database.Database_DAO.ClientTable.Read(reader); Database.Client Client = null; if (Clients.Count == 1) { Client = Clients[0]; } else { return(false); } reader.Close(); db.Close(); if (Client.password == password) { return(true); } else { return(false); } }