A common question reads something like this: "When I click the Edit link in one of my Datagrid rows, the page posts back and now contains no data. What went wrong?" The problem is that the data is only bound to the grid the first time the page is called. In each of the Datagrid's events (Edit, Update, Cancel, Page, Sort), make sure that you set the Datagrid's Datasource property (unless it is already set declaratively in the <asp:Datagrid> declaration), and call the DataBind() method on the Datagrid.
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