How to use the IRelationalOperator interface to check if a point feature within a pol

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I use the following code to check if a point feature is within a polygon feature

pFeaBlock is a polygon feature and Fea is a point feature

int blockID = -1;IFeatureCursor pBlockCursor = this._blockLayer.Search(null, false);IFeature pFeaBlock = pBlockCursor.NextFeature();while (pFeaBlock != null){ if (!pFea.Shape.IsEmpty) { IPolygon pPolygon = (IPolygon)pFea.Shape; IRelationalOperator pRelOperator = (IRelationalOperator)pPolygon; if (pRelOperator.Within(pFeaBlock.Shape) == true) { blockID = (int)pFeaBlock.get_Value(2); } } pFeaBlock = pBlockCursor.NextFeature(); }but I always get he COMException on

if (pRelOperator.Within(pFeaBlock.Shape) == true)Is anyone familiar this interface?Thanks in advance



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