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I had drawn a rectangle by adding element to graphics container like the code below:

IGraphicsContainer gc = mxDoc.FocusMap as IGraphicsContainer;
IRectangleElement rectangleElement = new RectangleElementClass();
IElement elem = rectangleElement as IElement;
gc.AddElement(elem, 0);

I want to remove the color from the rectangle or set the Transparency by 100, and keep the outline colored as it is.

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up vote 1 down vote accepted

QI/cast from your rectangle element to IFillShapeElement and set its Symbol.Color property to IColor.NullColor.

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thanks, i did it like this : IFillShapeElement fem = (IFillShapeElement)rectangleElement; ISimpleFillSymbol fillSymbol = new SimpleFillSymbolClass(); fillSymbol.Style = esriSimpleFillStyle.esriSFSHollow; fem.Symbol = fillSymbol; – IBRA Dec 16 '12 at 10:53

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