An instance of this class is created when a Tool has its ClientAction set to Oval, the user clicks on the Map or PageLayout, and the Tool's ServerActionClass is set to a class that implements IMapServerToolAction. The OvalEventArgs object is passed as the argument to the ServerAction method.

The OvalEventArgs will contain the center point, width and height that defines the oval (ellipse) drawn by the user. This oval may be used to do action on the server, such as querying the map or zooming the map. Note the coordinates and distances of the oval are in screen pixels, and may need to be converted to map coordinates before using the rectangle.

System.Object
   System.EventArgs
      ESRI.ArcGIS.ADF.Web.UI.WebControls.ToolEventArgs
         ESRI.ArcGIS.ADF.Web.UI.WebControls.OvalEventArgs
            ESRI.ArcGIS.ADF.Web.UI.WebControls.MapOvalEventArgs

Reference