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 ();