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Use the approach from Tutorial 5 - An ASP .NET Application for Data Editing to edit persistent objects by using the ASPxGridView control.
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This example uses the FormView component, which is bound to XpoDataSource with a single object in it. The XpoDataSource is filtered by the Oid key. A QueryString field supplies a value for the criteria parameter.
A local SQL Server is required to launch the example. You should run the DatabaseUpdater project first to create a database and fill it with data. Then set XpoWebApplication as a startup project and launch it. Data is displayed in the ASPxGridView. When the Edit link is clicked, a new page with the FormView is open for object editing.