Try this
public async Task<ActionResult> GetDailySalesReport(String date)
{
ViewBag.SyncOrAsync = "Asynchronous";
var gizmoService = new GizmoService();
return View("Gizmos", await gizmoService.GetGizmosAsync());
CommReportManager commReportManager = new CommReportManager();
var dailySalesReport = commReportManager.GetDailySalesReport(date);
return await Json(dailySalesReport);
}