WebPartManager.OnWebPartMoved Method (WebPartEventArgs)
Assembly: System.Web (in System.Web.dll)
The WebPartMoved event is raised when a control is moved within its current zone, or to another zone, and it does not matter whether the movement is done programmatically or by a user dragging the control.
Page developers can create a custom handler for the WebPartMoved event by adding the OnWebPartMoved attribute to the <asp:webpartmanager> element, and assigning a custom method name to the attribute.
Available since 2.0