update readme

Readme.md

@@ -3,22 +3,60 @@
 [![](https://img.shields.io/badge/Open_in_DevExpress_Support_Center-FF7200?style=flat-square&logo=DevExpress&logoColor=white)](https://supportcenter.devexpress.com/ticket/details/E3076)
 [![](https://img.shields.io/badge/📖_How_to_use_DevExpress_Examples-e9f6fc?style=flat-square)](https://docs.devexpress.com/GeneralInformation/403183)
 <!-- default badges end -->
-<!-- default file list -->
-*Files to look at*:
-
-* [Default.aspx](./CS/WebSite/Default.aspx) (VB: [Default.aspx](./VB/WebSite/Default.aspx))
-* [Default.aspx.cs](./CS/WebSite/Default.aspx.cs) (VB: [Default.aspx.vb](./VB/WebSite/Default.aspx.vb))
-<!-- default file list end -->
-# How to delete the ASPxGridView's selected rows
+# Grid View for ASP.NET Web Forms - How to Delete Selected Rows in a Grid
 <!-- run online -->
 **[[Run Online]](https://codecentral.devexpress.com/e3076/)**
 <!-- run online end -->
 
 
-<p>The example illustrates how to delete selected rows of the ASPxGridView bound with an in-memory DataSource.</p><p><strong>See Also:<br />
-</strong><a href="https://www.devexpress.com/Support/Center/p/E2636">How to move selected rows from the ASPxGridView into another ASPxGridView</a><strong><br />
-</strong><a href="https://www.devexpress.com/Support/Center/p/E257">Editing an in-memory dataset</a></p>
+The example shows how to delete the selected rows of an [ASPxGridView](https://docs.devexpress.com/AspNet/DevExpress.Web.ASPxGridView) that is bound to an in-memory DataSource.
+
+![A grid with selected rows to be deleted](images/resulting-grid.png)
+
+Use the client-side [PerformCallback](https://docs.devexpress.com/AspNet/js-ASPxClientGridView.PerformCallback(args)?p=netframework) method to send custom callbacks to the server when a user clicks the **Delete** button.
+
+```aspx
+function OnClickButtonDel(s, e) {
+    grid.PerformCallback('Delete');
+}
+...
+<dx:ASPxButton ID="buttonDel" AutoPostBack="false" 
+               runat="server" Text="Delete">
+    <ClientSideEvents Click="OnClickButtonDel"/>
+</dx:ASPxButton>
+```
+
+On the server, the `PerformCallback` method raises the [CustomCallback](https://docs.devexpress.com/AspNet/DevExpress.Web.ASPxGridView.CustomCallback?p=netframework) event. 
+
+In the `CustomCallback` event handler, call the [GetSelectedFieldValues](https://docs.devexpress.com/AspNet/DevExpress.Web.ASPxGridBase.GetSelectedFieldValues(System.String--)?p=netframework) method to obtain the selected rows. Then, call the [Remove](https://docs.microsoft.com/en-us/dotnet/api/system.data.datarowcollection.remove?view=net-6.0) method for each selected row.
+
+```cs
+protected void gridView_CustomCallback(object sender, ASPxGridViewCustomCallbackEventArgs e) {
+    if(e.Parameters == "Delete") {
+        table = GetTable();
+        List<Object> selectItems = grid.GetSelectedFieldValues("ID");
+        foreach(object selectItemId in selectItems) {
+            table.Rows.Remove(table.Rows.Find(selectItemId));
+        }
+        grid.DataBind();
+        grid.Selection.UnselectAll();
+    }
+}
+```
+
+## Files to Look At
+
+* [Default.aspx](./CS/WebSite/Default.aspx) (VB: [Default.aspx](./VB/WebSite/Default.aspx))
+* [Default.aspx.cs](./CS/WebSite/Default.aspx.cs#L45-L55) (VB: [Default.aspx.vb](./VB/WebSite/Default.aspx.vb#L60-L70))
+
+## Documentation
 
-<br/>
+* [ASPxGridView](https://docs.devexpress.com/AspNet/DevExpress.Web.ASPxGridView)
+* [Grid View - Add and Edit Records](https://docs.devexpress.com/AspNet/401098/components/grid-view/concepts/edit-data/add-and-edit-records)
+* [Grid View - Delete Records](https://docs.devexpress.com/AspNet/401080/components/grid-view/concepts/edit-data/delete-records)
+* [Grid View - Examples](https://docs.devexpress.com/AspNet/3768/components/grid-view/examples)
 
+## More Examples
 
+* [How to Move Selected Rows From the ASPxGridView Into Another ASPxGridView](https://github.com/DevExpress-Examples/how-to-move-selected-rows-from-the-aspxgridview-into-another-aspxgridview-e2636)
+* [How to Edit an In-Memory Dataset](https://github.com/DevExpress-Examples/aspxgridview-editing-an-in-memory-dataset-e257)