Raises events for the System.Web.UI.HtmlControls.HtmlInputImage control when it posts back to the server.
The HtmlInputImage.RaisePostBackEvent(string) method is used by the System.Web.UI.HtmlControls.HtmlInputImage control, when it is clicked, to raise a HtmlInputImage.ServerClick event.
If the HtmlInputImage.CausesValidation property is true; the System.Web.UI.Page.Validate(string) method is called using the group of controls specified in the HtmlInputImage.ValidationGroup property.
This method is used primarily by control developers extending the functionality of the System.Web.UI.HtmlControls.HtmlInputImage control.