UnityEditor.DragAndDrop.PrepareStartDrag_Internal C# (CSharp) Method

        private static extern void PrepareStartDrag_Internal();
        /// <summary>

 /// <summary>
 ///   <para>Clears drag &amp; drop data.</para>
 /// </summary>
 public static void PrepareStartDrag()
 {
     DragAndDrop.ms_GenericData = (Hashtable)null;
     DragAndDrop.PrepareStartDrag_Internal();
 }