Part Manager. Web Part Adding Event
public: event System::Web::UI::WebControls::WebParts::WebPartAddingEventHandler ^ WebPartAdding;
public event System.Web.UI.WebControls.WebParts.WebPartAddingEventHandler WebPartAdding;
member this.WebPartAdding : System.Web.UI.WebControls.WebParts.WebPartAddingEventHandler
Public Custom Event WebPartAdding As WebPartAddingEventHandler
The WebPartAdding event is raised by the OnWebPartAdding method after the process of adding a control to a zone has begun. This event provides an opportunity to cancel the process before it is complete. If the adding process is successful, this event is followed by the WebPartAdded event.
Page developers can provide custom handlers for the event by adding the
OnWebPartAdding attribute to the
<asp:webpartmanager> element in a page, and assigning a custom method name to the attribute.