update readme

Author: pollyndos

README.md

@@ -2,17 +2,15 @@
 [![](https://img.shields.io/badge/Open_in_DevExpress_Support_Center-FF7200?style=flat-square&logo=DevExpress&logoColor=white)](https://supportcenter.devexpress.com/ticket/details/T1179666)
 [![](https://img.shields.io/badge/📖_How_to_use_DevExpress_Examples-e9f6fc?style=flat-square)](https://docs.devexpress.com/GeneralInformation/403183)
 <!-- default badges end -->
-# Dashboard for ASP.NET Core - How to Change the Database Connection from the Dashboard UI
+# Dashboard for ASP.NET Core - How to Change the Database Connection from the Web Dashboard UI
 
 The example shows how to switch between database connections from the Web Dashboard UI. To implement conditional logic for the Web Dashboard Control, pass custom headers from the client side to the server. 
 
-![]()
+![](images/designer-toolbar.png)
 
-To be able to switch between databases from the UI, add buttons corresponding to databases to the Designer Toolbox (see the [customizeToolbar.js]() file). Use the [`preparing`](https://docs.devexpress.com/Dashboard/js-DevExpress.Dashboard.Designer.DesignerToolbarExtensionOptions?p=netframework#js_devexpress_dashboard_designer_designertoolbarextensionoptions_onpreparing) event to customize the existing items in the Designer Toolbar. 
+To switch between databases from the UI, add buttons corresponding to databases to the Designer Toolbox. Use the [`preparing`](https://docs.devexpress.com/Dashboard/js-DevExpress.Dashboard.Designer.DesignerToolbarExtensionOptions?p=netframework#js_devexpress_dashboard_designer_designertoolbarextensionoptions_onpreparing) event to customize the existing items in the Designer Toolbar. When a button is clicked, a custom header with the corresponding database name (*nwind*/*nwind2*) is passed with the [fetchRemoteService.headers](https://docs.devexpress.com/Dashboard/js-DevExpress.Dashboard.AjaxRemoteService#js_devexpress_dashboard_ajaxremoteservice_headers) option. After that, the [DashboardControl.reloadData](https://docs.devexpress.com/Dashboard/js-DevExpress.Dashboard.DashboardControl#js_devexpress_dashboard_dashboardcontrol_reloaddata) method is called to [reload the data](https://docs.devexpress.com/Dashboard/400983/web-dashboard/integrate-dashboard-component/dashboard-backend/manage-an-in-memory-data-cache?p=netframework#client-side). See the [customizeToolbar.js](./CS/wwwroot/js/customizeToolbar.js) file for implementation details.
 
-On the client, when a button is clicked, a custom header with the corresponding database name (*nwind*/*nwind2*) is added to the [fetchRemoteService.headers](https://docs.devexpress.com/Dashboard/js-DevExpress.Dashboard.AjaxRemoteService#js_devexpress_dashboard_ajaxremoteservice_headers) dictionary. After that, the [DashboardControl.reloadData](https://docs.devexpress.com/Dashboard/js-DevExpress.Dashboard.DashboardControl#js_devexpress_dashboard_dashboardcontrol_reloaddata) method reloads the data. Refer to the following topic for more information: [Manage an In-Memory Data Cache](https://docs.devexpress.com/Dashboard/400983/web-dashboard/dashboard-backend/manage-an-in-memory-data-cache).
-
-On the server, the [IHttpContextAccessor](https://docs.microsoft.com/en-us/aspnet/core/fundamentals/http-context?view=aspnetcore-3.0) with dependency injection is used to access the passed parameter value (database name) in the [DashboardConfigurator.ConfigureDataConnection](https://docs.devexpress.com/Dashboard/DevExpress.DashboardWeb.DashboardConfigurator.ConfigureDataConnection) event handler. The [CustomStringConnectionParameters](https://docs.devexpress.com/CoreLibraries/DevExpress.DataAccess.ConnectionParameters.CustomStringConnectionParameters) class instance is used to initialize and apply a custom connection string.
+On the server, the [IHttpContextAccessor](https://docs.microsoft.com/en-us/aspnet/core/fundamentals/http-context?view=aspnetcore-3.0) is used to access the passed parameter value (database name) in the [DashboardConfigurator.ConfigureDataConnection](https://docs.devexpress.com/Dashboard/DevExpress.DashboardWeb.DashboardConfigurator.ConfigureDataConnection) event handler. The [CustomStringConnectionParameters](https://docs.devexpress.com/CoreLibraries/DevExpress.DataAccess.ConnectionParameters.CustomStringConnectionParameters) class instance is used to initialize and apply a custom connection string.
 
 ## Files to Review
 
@@ -30,3 +28,4 @@ On the server, the [IHttpContextAccessor](https://docs.microsoft.com/en-us/aspne
 * [Dashboard for ASP.NET Core - How to Limit Data Displayed in Designer Mode](https://github.com/DevExpress-Examples/asp-net-core-dashboard-limit-designer-data)
 * [Dashboard for ASP.NET Core - How to Use Parameters to Update a Specific Dashboard Item Without Refreshing the Entire Dashboard](https://github.com/DevExpress-Examples/asp-net-core-dashboard-refresh-item-on-parameter-change)
 * [Dashboard for ASP.NET Core - How to implement authentication](https://github.com/DevExpress-Examples/aspnet-core-dashboard-jwt-authentication)
+