IFeatureSelection ipFeatureSelection = ipFeatureLayer as IFeatureSelection;
ipFeatureSelection.SelectFeatures(ipQueryFilter1, esriSelectionResultNew,false);
ipFeatureSelection.SelectFeatures(ipQueryFilter2, esriSelectionResultAdd,false);
ipFeatureSelection.SelectFeatures(ipQueryFilter3, esriSelectionResultAdd,false);
……
ipMapControl.Refresh(esriViewGeoSelection);
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