> Hello,
> My GridView is bound to an ObjectDataSource for select / update /
> insert. Everything basically works as expected.
>
> However, in the following scenario there is a problem:
> My entity "Customer" consisits of three properties, "id", "Name" and
> "City". These are all being displayed in the GridView.
>
> Now I add a fourth Property "State" to the custom entity, which is
> being used elsewhere. It is not being displayed in the grid.
>
> Now, every time the "Customer" entity is being updated from my
> GridView, the State property is being reset to the default value! Only
> if I add a bound column for the "State" property to the grid (could be
> invisible), the value is actually left as it was.
>
> This is very dangerous and means, that if somebody adds a new Property
> to the Customer entity, she/he has to remember to update all the
> GridViews in the entiry application with the new property. This can't
> be the ultimate solution?!
>
> How can I prevent this behaviour?
>
> Thanks for any help,
> Urs

> Urs,
>
> this is by design when you are using the ObjectDataSource with custom
> object as parameters for the update method.
>
> When the update operation takes place, the ObjectDataSource
> instantiates a new object (a Customer in your case), and then sets its
> properties with the values from the control using the data source. In
> your sample, the GridView passes a Customer instance with the Id, Name
> and City properties set, but the missing properties  are not set and
> have the default values. When the update completes you have lost the
> proper values of the properties that are not shown!
>
> Take a look at the ExtendedObjectDataSource that can help you in this
> scenario:
> http://www.manuelabadia.com/livedemo/extendedobjectdatasource/DataObjectTypeControl.aspx
>
> Regards,
> Manuel Abadia
> http://www.manuelabadia.com
>
> Urs Eichmann ha escrito:
>
> > Hello,
> > My GridView is bound to an ObjectDataSource for select / update /
> > insert. Everything basically works as expected.
> >
> > However, in the following scenario there is a problem:
> > My entity "Customer" consisits of three properties, "id", "Name" and
> > "City". These are all being displayed in the GridView.
> >
> > Now I add a fourth Property "State" to the custom entity, which is
> > being used elsewhere. It is not being displayed in the grid.
> >
> > Now, every time the "Customer" entity is being updated from my
> > GridView, the State property is being reset to the default value! Only
> > if I add a bound column for the "State" property to the grid (could be
> > invisible), the value is actually left as it was.
> >
> > This is very dangerous and means, that if somebody adds a new Property
> > to the Customer entity, she/he has to remember to update all the
> > GridViews in the entiry application with the new property. This can't
> > be the ultimate solution?!
> >
> > How can I prevent this behaviour?
> >
> > Thanks for any help,
> > Urs