Add description to how-to

docs/aspnet-mvc/helpers/grid/how-to/grid-bind-to-datatable.md

@@ -8,4 +8,28 @@ description: Bind the Kendo UI MVC Grid to a DataTable
 
 This project demonstrates how to bind the UI for ASP.NET MVC Grid to a DataTable.
 
+> The same approach is applicable when binding to any `dynamic` model.
+
+## Sample project
+
+The full source code of the sample project is available on GitHub:
 [Bind the Kendo UI MVC Grid to a DataTable](https://github.com/telerik/ui-for-aspnet-mvc-examples/tree/master/grid/binding-to-datatable)
+
+## Problems
+There are two main problems that this sample solves.
+
+### Editing
+
+The Grid does not have an instance to a model object and cannot infer field types.
+We need to provide the model field definitions ourselves.
+
+The DataTable metadata contains this information.
+We can pull it into the model definition as illustrated in
+[Index.cshtml:29](https://github.com/telerik/ui-for-aspnet-mvc-examples/blob/master/grid/binding-to-datatable/KendoUIMVC5/Views/Home/Index.cshtml#L29)
+
+### Aggregates
+
+The aggregates suffer from lack of type information as well. The ToDataSourceResult helper does not have information about the field types and fails to compute the aggregates on its own.
+
+The solution is to provide type information for the requested aggregates in the DataSourceRequest object. See [HomeController.cs:33](https://github.com/telerik/ui-for-aspnet-mvc-examples/blob/master/grid/binding-to-datatable/KendoUIMVC5/Controllers/HomeController.cs#L33)
+