Retrieves the zero-based index of the first occurrence of the specified key within the entire collection.
Assembly: System.Windows.Forms (in System.Windows.Forms.dll)
If is called successively, the last returned index will be checked for a key match first, and if there is no match, the search starts at the beginning of the collection.
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.