Aspxgridview objectdatasource updating
The example requires a LINQ to SQL class that represents the Northwind database and Employees table. For more information, see How to: Create LINQ to SQL Classes in a Web Project.
The first example shows a Web page that contains two Object Data Source controls, a Drop Down List control, and a Details View control.This enables you to provide an event-handling method that performs a custom routine, such as canceling the update operation, whenever this event occurs.A Grid View Update Event Args object is passed to the event-handling method, which enables you to determine the index of the current row and to indicate that the update operation should be canceled.In this article I will show you how you can use the Object Data Source with the Grid View control to do editing, updating, deleting and adding new records.There are several ways to perform these operations, I am using the simplest approach.I am trying to display an error message in the edit section of a ASPx Grid View when a user has tried to submit invalid data.
I have been looking around and have found one blog that allows me to place an error message in red once it has filed validation by throwing a New Invalid Operation Exception.
Finally, you can programmatically add and remove parameters in the Updating event, which occurs before the Update method is run.
The method is resolved after the parameters are merged.
If it is an instance method, the business object is created and destroyed each time the method that is specified by the property is called.
If the business object implements the IDisposable interface, the Dispose method is called before the object is destroyed. Next, the parameters that are listed in the Update Parameters element are added.
If the method is static (Shared in Visual Basic), the business object is never created and you cannot handle the Object Created, Object Creating, and Object Disposing events. If a parameter in the Update Parameters element is found with the same name as a parameter that is already in the collection, the existing parameter is modified to match the parameter that is specified in the Update Parameters element.