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Returns the zero-based index of the
public int IndexOf(
is not in the Visual , -1 is returned. If VisualCollection is passed to the method, the index of the first entry that has null is returned. If there is no null entry, -1 is returned. null .NET Framework
Supported in: 4.5.1, 4.5, 4, 3.5, 3.0
.NET Framework Client Profile
Supported in: 4, 3.5 SP1
Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.