public void prepare_CmBox() { mark1.DataSource = SQL_Class.get_data_Source_with_Null("select Mark from marktable"); type1.DataSource = SQL_Class.get_data_Source_with_Null("select Type from typetable"); place1.DataSource = SQL_Class.get_data_Source_with_Null("select Place from placetable"); place21.DataSource = SQL_Class.get_data_Source_with_Null("select Place2 from place2table"); status1.DataSource = SQL_Class.get_data_Source_with_Null("select Status from statustable"); status21.DataSource = SQL_Class.get_data_Source_with_Null("select Status2 from status2table"); os1.DataSource = SQL_Class.get_data_Source_with_Null("select OS from ostable"); owner1.DataSource = SQL_Class.get_data_Source_with_Null("select Owner from ownertable"); }