how to set themes for devexpress scheduler

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Javascript

I am new to devexpress,I am trying to implement asp.net mvc scheduler.I have defined the scheduler like

@Html.DevExpress().Scheduler(
    settings => {
        settings.Name = "scheduler";
        settings.CallbackRouteValues = new { Controller = "Scheduler", Action =  "GroupingPartial" };
        settings.ActiveViewType = SchedulerViewType.Day;
        settings.Start = new DateTime(2010, 7, 13);
        settings.Width = Unit.Percentage(100);
        settings.Views.DayView.ResourcesPerPage = 2;

        settings.Views.WorkWeekView.ResourcesPerPage = 2;

        settings.Views.WeekView.ResourcesPerPage = 2;

        settings.Views.MonthView.ResourcesPerPage = 2;

        settings.Views.TimelineView.ResourcesPerPage = 2;

        settings.GroupType = (SchedulerGroupType)Session["GroupType"];

        settings.Storage.Resources.Assign(SchedulerDemoHelper.DefaultResourceStorage);

    }).Bind(Model.Appointments, Model.Resources).GetHtml()

how to apply theme for the scheduler?Is there any additional code added to web.config file?