IMap pMap = axMapControl1.Map;
            IFeatureLayer pFeaturelayer = GetLayer(pMap, "Export_Output4") as IFeatureLayer;
            IFeatureSelection pFeatureSelection = pFeaturelayer as IFeatureSelection;
            IQueryFilter pQuery = new QueryFilterClass();
            pQuery.WhereClause = "name = '彭州市'";
            pFeatureSelection.SelectFeatures(pQuery ,esriSelectionResultEnum.esriSelectionResultNew,false );
            axMapControl1 .ActiveView .Refresh ();