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Clears cache for a given layer within a given extent.
[Visual Basic .NET] Public Sub Clear ( _ ByVal pLayer As ILayer, _ ByVal pExtent As IEnvelope _ )
[C#] public void Clear ( ILayer pLayer, IEnvelope pExtent );
[C++]
HRESULT Clear(
  ILayer* pLayer,
  IEnvelope* pExtent
);
[C++] Parameters pLayer [in]
pLayer is a parameter of type ILayer* pExtent
pExtent is a parameter of type IEnvelope*