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HtmlSelect.OnDataBinding(EventArgs) Method

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Definition

Namespace:
System.Web.UI.HtmlControls
Assembly:
System.Web.dll

Raises the DataBinding event of an HtmlSelect control.

protected:
 override void OnDataBinding(EventArgs ^ e);
protected override void OnDataBinding (EventArgs e);
override this.OnDataBinding : EventArgs -> unit
Protected Overrides Sub OnDataBinding (e As EventArgs)

Parameters

e
EventArgs

A EventArgs that contains the event data.

Exceptions

HttpException

The DataSourceID property is not of type IDataSource.

-or-

The DataSourceID property is not of type IHierarchicalDataSource.

InvalidOperationException

Both a DataSource and a DataSourceID property are defined for the HtmlSelect control.

-or-

The requested data view cannot be found.

ArgumentOutOfRangeException

The SelectedIndex property was set to a value greater than the number of items in the HtmlSelect control or less than -1.

Remarks

The DataBinding event is raised when data is bound to the HtmlSelect control. This method notifies the control to perform any data-binding logic that is associated with it. Specifically, the OnDataBinding method creates the Items collection from the data source specified in either the DataSource property or the DataSourceID property.

Raising an event invokes the event handler through a delegate. For more information, see Handling and Raising Events.

The OnDataBinding method also allows derived classes to handle the event without attaching a delegate. This is the preferred technique for handling the event in a derived class.

Notes to Inheritors

When overriding the OnDataBinding(EventArgs) method in a derived class, be sure to call the base class's OnDataBinding(EventArgs) method so that registered delegates receive the event.

Applies to

See also