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And when debugging, the pre-action events provide an opportunity for examining what parameters (if any) are being used to query the data. - the Sql Data Source and Object Data Source controls raise pre- and post-action events.
One event precedes the action, one event follows it.
Regardless, the value of the parameter can be examined and modified (if needed) in the event handler. To programmatically assign this input parameter value in the Object Data Source's Protected Sub Categories Data Source_Selecting(By Val sender As Object, By Val e As System. The Object Data Source's post-action event handler is also passed the value returned by the invoked object library method (if any).
(See Filtering Database Data with Parameters for more information on using parameters with the data source controls.) For the Sql Data Source control, you can access the parameter value using Protected Sub Categories Data Source_Selecting(By Val sender As Object, By Val e As System. An exception could occur if the database was down, an illegal parameter value was used, the action violated a constraint, or for some other reason.
The Command object contains information about the command to be issued (via the collection there would be a parameter. The download available at the end of this article provides a helpful method for displaying the and all of the Command's parameters when retrieving or modifying data through the Sql Data Source control. Like the Sql Data Source, the Object Data Source's pre-action events provide an opportunity to customize the parameters being passed into the configured object method. Object Data Source Selecting Event Args) Handles Categories Data Source. After the specified action has been completed, the Sql Data Source and Object Data Source controls raise their corresponding post-action events ().
The parameter's source could be specified declaratively, using a hard-coded value or pulling its value from a Web control on the page, a querystring value, and so on. Sql Data Source Selecting Event Args) Handles Categories Data Source. Instead of receiving a Command object in the event handler, the Object Data Source's pre-action event handlers are passed a dictionary object called , where the Integer input parameter department ID is used internally to return only those employees belonging to the specified department. In the post-action event handler, the number of affected rows is reported as is whether an exception occurred.
I found that simple data binding of my Drop Down List in my Grid View to my Sql Data Source was not going to be enough.
I would need to set values passed to the Sql Data Source control on the update event, and as part of this I would need to reference the controls contained in the row being updated.
The Sql Data Source and Object Data Source controls are the two most commonly used data source controls, and they provide a means for retrieving and modifying data from either a database or object library, respectively.
I am trying to get the values out of the update template to use in an update statement in the code behind.
When I set the var values, it is setting the original text box value and not the edited value.
Then within the new method one can access controls within the Grid View row being edited by referencing the Row Index attribute of the Grid View’s Rows collection. Find Control("ddl Service Level List"), Drop Down List) Dim lbl Support Date As Label = CType(GVSupport Info.
So for example to reference a Drop Down List within the Grid View Row, use the syntax: Basically this is quite straightforward once one knows the syntax for referencing a control within a Grid View Row. Grid View Update Event Args) Dim lbl Service Level As Drop Down List = CType(GVSupport Info.