Assembly: System.Windows.Forms (in system.windows.forms.dll)
The value of this field depends on the message. Use the LParam field to get information that is important for handling the message. LParam is typically used to store an object if it is needed by the message. Use the GetLParam method to retrieve and convert information from the LParam field into an object.
Windows 98, Windows 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 Edition
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see System Requirements.