Shape.RectangleToClient Method (Rectangle)
Computes the size and location of the specified screen rectangle in client coordinates.
Assembly: Microsoft.VisualBasic.PowerPacks.Vs (in Microsoft.VisualBasic.PowerPacks.Vs.dll)
Some properties and methods express coordinates relative to the upper-left corner of the screen; others express them relative to the client form. The RectangleToClient and RectangleToScreen methods can be used to convert between the two.