Objectdatasource updating event

25-May-2020 05:30 by 6 Comments

Objectdatasource updating event

For more information, see How to: Create LINQ to SQL Classes in a Web Project.

The first Object Data Source control and the Drop Down List control are used to retrieve and display employee names from the database.The original data must be passed to the database so that it can be used to check whether the data has been modified by another process.The third example shows the data access class that interacts with the Northwind database. Therefore, you cannot directly cancel the Update database operation by calling the Cancel method on the Db Command object that is exposed by the Sql Data Source Command Event Args object.You can, however, cancel the database operation by setting the The following code example demonstrates how to display data that is retrieved from a Microsoft SQL Server database in a Drop Down List control and update the record using a Text Box control.Typically, this is used to modify the type of the data in the parameter.

Finally, you can programmatically add and remove parameters in the Updating event, which occurs before the Update method is run.The following three examples show a Web page, a code-behind page class, and a data-access class that enable a user to retrieve and update records in the Employees table in the Northwind database.event handler serializes the object that contains data that was retrieved from the Employee table. The Updating event handler deserializes the object in view state that contains the original data for the data record that is being updated.The example shows how you can use a Db Transaction object to add transaction context when using the Sql Data Source control to update data.event to examine the values of a return value or output parameters, or to determine whether an exception was thrown after an Update operation has completed. Please build a function to make sure that only valid columns are specified in the sort expression to avoid a SQL Injection attack.

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