Returns the index within the collection of the specified subitem.
Assembly: System.Windows.Forms (in System.Windows.Forms.dll)
Return ValueType: System.Int32
The zero-based index of the subitem's location in the collection. If the subitem is not located in the collection, the return value is negative one (-1).
The method enables you to determine the position of a subitem in the collection. To determine whether a subitem is contained in the collection before calling this method, use the Contains method.
Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.