How to Create Screen Point to ArcMap Ipoint in ArcObject C#

By using this statement you can change your screen point to ArcMap Ipoint.

public override void OnMouseDown(int Button, int Shift, int X, int Y)
{
   try
   {
        IMxDocument pDoc = m_application.Document as IMxDocument;
        IMap map = pDoc.FocusMap;
        IActiveView activeView =  pDoc.ActiveView;
        IPoint pnt = activeView.ScreenDisplay.DisplayTransformation.ToMapPoint(X, Y);
   }
   catch (Exception ex)
   {
   }
}