These concepts carry over to the DetailsView and FormView controls and also apply to inserting and deleting. Otherwise it updates the existing product record's ProductName and UnitPrice fields accordingly and commits the update by calling the TableAdpater's Update method, passing in the ProductsRow instance. Similarly, if a required field, such as ProductName, is removed from the editing interface, the update will fail with a "Column 'ProductName' does not allow nulls" exception. If not, it returns false, indicating that the request to update the product information failed. Cancel to true and display a message explaining why if the UnitPrice value in the NewValues collection is null. This DetailsView will be used to provide an interface for quickly adding a new product to the database. What we want, however, is an inserting interface that provides a means for the user to quickly add a new product to the database. The event handlers for these three events are passed an object of type ObjectDataSourceMethodEventArgs that has two properties of interest: If the user attempts to update a product without specifying the UnitPrice, we want to cancel the update and display the warning label.
If we want to provide a data Web control that allows the end user to only update a subset of fields, then we need to either programmatically set the missing UpdateParameters values in the ObjectDataSource's Updating event handler or create and call a BLL method that expects only a subset of the fields. The formatting instructions specified in the DataFormatString property can be applied to the editing interface by setting the BoundField's ApplyFormatInEditMode property to true the default is false. Similarly, if there is some combination of non-read-only product fields in the GridView that doesn't correspond to the input parameters for a UpdateProduct overload, an exception will be raised when attempting to update. As you can see, the DetailsView lists the name and price of the first product Chai. Update, false ] public bool UpdateProduct string productName, decimal? While the GridView example shown in Figure 6 works, the UnitPrice field is not formatted at all, resulting in a price display that lacks any currency symbols and has four decimal places. The following example demonstrates how to use the RowUpdating event to update the values in the data source object when the data source is set programmatically. Controls 0 , TextBox. Hence, the ObjectDataSource wizard selects these each time you run the wizard unless there's some other value explicitly specified. When the Update method is invoked, the ObjectDataSource's Updating event fires, providing an opportunity to add or customize the values of any of the UpdateParameters. NET data Web control. We can, at this point, cancel the update request if there is some validation error. This GridView's editing interface will only allow the user to update the two displayed fields, ProductName and UnitPrice. Inserting, updating, or deleting data from the GridView, DetailsView, or FormView precipitates the same sequence of pre- and post-level events for both the data Web control and the ObjectDataSource. Figure 1 depicts this series of events and steps when updating a GridView. Otherwise it updates the existing product record's ProductName and UnitPrice fields accordingly and commits the update by calling the TableAdpater's Update method, passing in the ProductsRow instance. However, we can use the ObjectDataSource's Inserting event to inject different default values, as we'll see shortly. Figure 11 shows both the problem caused by currency symbols in the user-supplied UnitPrice, along with how the GridView's RowUpdating event handler can be utilized to correctly parse such input. Parse , parsing the value as a currency. If not, it returns false, indicating that the request to update the product information failed. Augment the GridView's RowUpdating event handler as follows: As we discussed in the previous tutorial , when a row is edited in the GridView the Edit button is replaced by Update and Cancel buttons and the BoundFields turn into TextBoxes. Let's extend the RowUpdating event handler to set e. However, since our BLL methods don't expect the original ProductID value to be passed in, remove this property assignment altogether from the ObjectDataSource's declarative syntax. Occurs when a row's Update button is clicked, but before the GridView control updates the row. We'll also see how to customize the editing interface to only update a subset of the product fields. When using the built-in inserting, editing, or deleting features of the GridView, DetailsView, or FormView controls, a variety of steps transpire when the end user completes the process of adding a new record or updating or deleting an existing record.
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