Removes all items from the collection.
public virtual void Clear()
When you remove items from the collection, all information about the deleted items is lost. To remove a single item from the collection, use the Remove or RemoveAt method.
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.