public void updateMessage ( Message message)
		{
			string sql = "UPDATE `SmsApplicatie`.`messages` " +
			             "SET numberReceiver=:numberReceiver, message=:message, sendAt=:sendAt, contactId=:contactId" +
			             "where id=:id";
			MySqlCommand statement = this.databaseConnection.CreateCommand ();
			statement.CommandText = sql;
			statement.Prepare ();
			statement.Parameters.AddWithValue ( "numberReceiver", message.getNumberReceiver() );
			statement.Parameters.AddWithValue ( "message", message.getMessageBody() );
			statement.Parameters.AddWithValue ( "sendAt", message.getSendAt() );
			statement.Parameters.AddWithValue ( "contactId", message.getContactId() );
			statement.Parameters.AddWithValue ( "id", message.getId() );
		}
		public void insertMessege ( Message message)
		{
			string sql = "INSERT INTO `SmsApplicatie`.`messages`( numberReceiver, message, sendAt, contactId ) " +
			             "VALUES ( :numberReceiver, :message, :sendAt, :contactId )";

			MySqlCommand statement = this.databaseConnection.CreateCommand ();
			statement.CommandText = sql;
			statement.Prepare ();
			statement.Parameters.AddWithValue ( "numberReceiver", message.getNumberReceiver() );
			statement.Parameters.AddWithValue ("message", message.getMessageBody () );
			statement.Parameters.AddWithValue ("sendAt", Convert.ToString (message.getSendAt ()));
			statement.Parameters.AddWithValue ("contactId", message.getContactId ());

			if ( statement.ExecuteNonQuery () == 0 ){
				throw new ApplicationException ();
			}
		}