Data Binding Events for Data-Bound Controls
To help you understand the relationship between the page life cycle and data binding events, the following table lists data-related events in data-bound controls such as the GridView, DetailsView, and FormView controls.
| Control Event | Typical Use |
| DataBinding | This event is raised by data-bound controls before the PreRender event of the containing control (or of the Page object) and marks the beginning of binding the control to the data. Use this event to manually open database connections, if required. (The data source controls often make this unnecessary.) |
| RowCreated (GridView only) or ItemCreated (DataList, DetailsView, SiteMapPath, DataGrid, FormView, Repeater, and ListView controls) | Use this event to manipulate content that is not dependent on data binding. For example, at run time, you might programmatically add formatting to a header or footer row in a GridView control. |
| RowDataBound (GridView only) or ItemDataBound (DataList, SiteMapPath, DataGrid, Repeater, and ListView controls) | When this event occurs, data is available in the row or item, so you can format data or set the FilterExpression property on child data source controls for displaying related data within the row or item. |
| DataBound | This event marks the end of data-binding operations in a data-bound control. In a GridView control, data binding is complete for all rows and any child controls. Use this event to format data bound content or to initiate data binding in other controls that depend on values from the current control''s content. (For details, see "Catch-up Events for Added Controls" earlier in this topic.) |
Login Control Events
The Login control can use settings in the Web.config file to manage membership authentication automatically. However, if your application requires you to customize how the control works, or if you want to understand how Login control events relate to the page life cycle, you can use the events listed in the following table.
| Control Event | Typical Use |
| LoggingIn | This event is raised during a postback, after the page''s LoadComplete event has occurred. It marks the beginning of the login process. Use this event for tasks that must occur prior to beginning the authentication process. |
| Authenticate | This event is raised after the LoggingIn event. Use this event to override or enhance the default authentication behavior of a Login control. |
| LoggedIn | This event is raised after the user name and password have been authenticated. Use this event to redirect to another page or to dynamically set the text in the control. This event does not occur if there is an error or if authentication fails. |
| LoginError | This event is raised if authentication was not successful. Use this event to set text in the control that explains the problem or to direct the user to a different page. |
