Specifies the field of the message.
Assembly: System.Windows.Forms (in System.Windows.Forms.dll)
The value of this field depends on the message. Use the field to get information that is important for handling the message. 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 field into an object.
Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98
The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.