There is already an open DataReader associated with this Connection which must be closed first. 於 MySql.Data.MySqlClient.MySqlCommand.CheckState() 於 MySql.Data.MySqlClient.MySqlCommand.ExecuteReader(CommandBehavior behavior) 於 MySql.Data.MySqlClient.MySqlCommand.ExecuteScalar() 於 userReport.Draw5Days(Int32 DayOffSet)