After you created a dashboard and saved it to the storage, you can use the DashboardExtensionSettings.InitialDashboardId property to load this dashboard by a dashboard identifier. To obtain the identifiers of available dashboards, use the IDashboardStorage.GetAvailableDashboardsInfo method. The DashboardExtensionSettings.LoadDefaultDashboard method allows you to specify whether or not the default dashboard should be loaded from the dashboard storage.
The DashboardInMemoryStorage and DashboardFileStorage classes implement the IDashboardStorage interface. Cast a corresponding object to IDashboardStorage and use IDashboardStorage.GetAvailableDashboardsInfo to obtain available dashboard identifiers.
You can also use the ASPxClientDashboard.LoadDashboard client-side method to load a dashboard with the specified identifier.