Assembly: System.Windows.Forms (in system.windows.forms.dll)
win is a null reference (Nothing in Visual Basic).
The Hide method hides the ToolTip for the specified Control if it is currently being displayed. It does not disable or otherwise prevent the same ToolTip from being displayed in the future. To instead disable all ToolTip windows associated with the current ToolTipTitle component, set the Active property to false.
Applications running in partial trust must assert the AllWindows permission to use this method, as Hide can hide the tip independent of user action.
Windows 98, Windows Server 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Mobile for Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter EditionThe Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.