This event occurs when text is dragged to the following locations:
Within or between HTML pages hosted in the System.Windows.Forms.WebBrowser control or Internet Explorer
To another application
To the Windows desktop
You can cancel the default action for a HtmlElement.Drag event on an element by setting the HtmlElementEventArgs.ReturnValue property of the System.Windows.Forms.HtmlElementEventArgs class to true.
A HtmlElement.Drag event on an element will also occur on that element's parent elements and on the System.Windows.Forms.HtmlDocument class itself, unless you set the HtmlElementEventArgs.BubbleEvent property of the System.Windows.Forms.HtmlElementEventArgs class to true.
For more information about the difference between canceling event bubbling and canceling the default action on an event, see tp://msdn.microsoft.com/en-us/library/ms533022.aspx.