public static async Task <IEnumerable <IGroup> > ByDisplayNamesAsync(this IGroupCollection groups, params string[] displayNames)
 {
     return(await groups.OfType <IGroup>().ByDisplayNamesAsync(displayNames).ConfigureAwait(false));
 }
 public static IEnumerable <IGroup> ByDisplayNames(this IGroupCollection groups, params string[] displayNames)
 {
     return(groups.OfType <IGroup>().ByDisplayNames(displayNames));
 }