The System.Drawing.Point.X and System.Drawing.Point.Y coordinate values retrieved are negative if the control has scrolled away from its starting position (0,0). When you set this property, you must always assign positive System.Drawing.Point.X and System.Drawing.Point.Y values to set the scroll position relative to the starting position. For example, if you have a horizontal scroll bar and you set x and y to 200, you move the scroll 200 pixels to the right; if you then set x and y to 100, the scroll appears to jump the left by 100 pixels, because you are setting it 100 pixels away from the starting position. In the first case, ScrollableControl.AutoScrollPosition returns {-200, 0}; in the second case, it returns {-100,0}.