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.IList .Add Method
System .Int32 The position into which the new element was inserted, or -1 to indicate that the item was not inserted into the collection. Implements IList .Add(Object)
This member is an explicit interface member implementation. It can be used only when the
instance is cast to an Array interface. IList .NET Framework
Supported in: 4, 3.5, 3.0, 2.0, 1.1, 1.0
.NET Framework Client Profile
Supported in: 4, 3.5 SP1
Portable Class Library
Supported in: Portable Class Library
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.