لا يقوم بعمل تحديث ما هي المشكلة

السلام عليكم و رحمة الله و بركاته

في الحقيقة اني صممت قاعدة بيانات و انزلتها على صفحة الويب لكن المشكله عندما ما اعمل تحديث للقاعدة يعطيني هذه الرساله

ما المشكلة ؟

ObjectDataSource 'ObjectDataSource2' could not find a non-generic method 'Update' that has parameters: DepartmentID, SubDepartmentID, TradeItemName, UnitID, ShelfPlaceNo, DaysBeforExpireDate, MinistryQyt, MaxCount, MidCount, LowCount, ItemType, original_ItemID.

Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.InvalidOperationException: ObjectDataSource 'ObjectDataSource2' could not find a non-generic method 'Update' that has parameters: DepartmentID, SubDepartmentID, TradeItemName, UnitID, ShelfPlaceNo, DaysBeforExpireDate, MinistryQyt, MaxCount, MidCount, LowCount, ItemType, original_ItemID.

Source Error:

An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.