layer.UpdateFeatures is not working

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I m new in mapguide 2010, i want to filter on layer data which connected with oracle db. Kindly somebody help me about this.

MgFeatureCommandCollection

updateCommands = new MgFeatureCommandCollection();

updateCommands.Add (new MgDeleteFeatures ("Point", "clientid like '2%'")); layer = map.GetLayers().GetItem("Point");

MgLayer.UpdateFeatures(commands);

layer

layer.Visible = true;
layer.ForceRefresh();

Above code throwing "null" Error on this: layer.updatefeature.

Please somebody help me......

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