Updating access form

As Figure 4 shows, when the page is visited through a browser a Delete button is included. Figure 4: Each Grid View Row Now Includes a Delete Button (Click to view full-size image) Upon clicking a Delete button, a postback occurs, the Grid View assigns the Figure 5 depicts this interaction graphically.Refer back to the Examining the Events Associated with Inserting, Updating, and Deleting tutorial for a more detailed discussion on the chain of events associated with inserting, updating, and deleting from a data Web control.An Overview of Inserting, Updating, and Deleting examined using the Object Data Source to facilitate inserting, updating, and deleting with the Grid View, Details View, and Form View controls.

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As we'll see in this tutorial, these statements can be created manually or can be automatically generated by the Sql Data Source s Configure Data Source wizard.

Note Since we ve already discussed the inserting, editing, and deleting capabilities of the Grid View, Details View, and Form View controls, this tutorial will focus on configuring the Sql Data Source control to support these operations.

Other thread-related bugs are possible, such as race conditions and deadlocks.

It is important to make sure that access to your controls is performed in a thread-safe way.

To accomplish this we need to specify values for the Sql Data Source control s statement created in Step 2.

For now, let s use the Properties window in the Designer, although the Configure Data Source wizard or declarative syntax option would work just as well.

More Info This poses a challenge if you want to update UI elements during those long running operations or as result of them. You can force updates to UI elements from other threads using PInvoke\Thread Un Safe methods.

These are usually not recommended since the alternative is well established and easy to implement.

When the Sql Data Source control s method is invoked either programmatically or automatically from a data Web control a connection to the database is established, the parameter values are assigned to the query, and the command is shuttled off to the database.

The results are then returned as either a Data Set or Data Reader, depending on the value of the control s value has been specified, the Enable Inserting, Enable Editing, or Enable Deleting option in the corresponding data Web control s smart tag will become available.

NET application, the UI elements are created and updated by the main thread.

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