Linq submitchanges not updating
) C:\Drive D\TESTS4WORK\Mvc4Test Planning Schedules\Mvc4Test Planning Schedules\Controllers\Schedule_Other 35 20 Mvc4Test Planning Schedules the entiry framework is designed for statefull applications. Test Planners Schedules Data Context' does not contain a definition for 'Attach' and no extension method 'Attach' accepting a first argument of type 'Mvc4Test Planning Schedules. Test Planners Schedules Data Context' could be found (are you missing a using directive or an assembly reference?In this post I’m going to discuss the effects of changing the underlying database table has on Linq to SQL and to make people aware of the potential issues as quite a few people seem to be asking about this.Changes to the underlying database structure is a problem with any application and data access, be it and Datasets, Sub Sonic, Linq or any other approach. if the postback model is an entity you can attach it to a context, and mark it as modified (as the context does not have the original entity it can not track changes). instead use the following logic: post view build new model from postback data (done by binding) db = create new context entity = get original entity update entity from postback model save changes release context Hi Rollo1002, I have checked that I have installed my EF 4.1, but I get the error: Error 1 'Mvc4Test Planning Schedules. Test Planners Schedules Data Context' does not contain a definition for 'Entry' and no extension method 'Entry' accepting a first argument of type 'Mvc4Test Planning Schedules. Test Planners Schedules Data Context' could be found (are you missing a using directive or an assembly reference? its logic is db = create context entity = get entity make changes to entity object (known to the context, which will track changes) save changes release context but web application are stateless, get view db = create context entity = get entity release context the trick here is the postback model, is not attached to any dbcontext, its a brand new object whose properties are set to the postback values (which may not be all values).Regardless of how many changes you make to your objects, changes are made only to in-memory replicas.You have made no changes to the actual data in the database.
However, if you go against this and write your logic in the actual Data Context.class then when you recreate it, you will lose these changes.Either, regenerate the entire datacontext using SQLMetal, or remove the table from the datacontext using the designer and then insert it again.Shame there isn’t a button called refresh on the designer.Regenerating our Data Context So, if you are changing the underlying table, updating the Data Context in your system is also required.In Visual Studio 2008 there are only two ways to update a Data Context.