How can I detect when Windows 10 enters tablet mode in a Windows Forms application?

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To get whether the system is in tablet mode or not, query the system metric ConvertibleSlateMode like so (not tested, but it should work fine as far back as XP):

public static class TabletPCSupport
{
   private static readonly int SM_CONVERTIBLESLATEMODE = 0x2003;
   private static readonly int SM_TABLETPC = 0x56;

   private static Boolean isTabletPC = false;

   public static Boolean SupportsTabletMode { get { return isTabletPC; }}

   public static Boolean IsTabletMode 
   {
       get
       {
           return QueryTabletMode();
       }
   }

   static TabletPCSupport ()
   {
        isTabletPC = (GetSystemMetrics(SM_TABLETPC) != 0);
   }

   [DllImport("user32.dll", SetLastError = true, CharSet = CharSet.Auto, EntryPoint = "GetSystemMetrics")]
   private static extern int GetSystemMetrics (int nIndex);

   private static Boolean QueryTabletMode ()
   {
       int state = GetSystemMetrics(SM_CONVERTIBLESLATEMODE);
       return (state == 0) && isTabletPC;
   }
}

(Documentation here)

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