chore(Grid): update onread examples due to a latest changes

Author: xristianstefanov

components/grid/manual-operations.md

@@ -232,7 +232,6 @@ This sample shows how to set up the grid to use grouping with manual data source
 @code {
     public List<Employee> SourceData { get; set; }
 
-    // Handling grouping happens here - by casting the DataSourceResult.Data to objects
     protected async Task ReadItems(GridReadEventArgs args)
     {
         // in this example, we use the Telerik extension methods to shape the data
@@ -243,7 +242,7 @@ This sample shows how to set up the grid to use grouping with manual data source
         // to work with grouping, the grid data needs to be an IEnumerable<object>
         // because grouped data has a different shape than non-grouped data
         // and this is, generally, hidden from you by the grid, but now it cannot be
-        args.Data = datasourceResult.Data.Cast<object>().ToList();
+        args.Data = datasourceResult.Data;
 
         args.Total = datasourceResult.Total;
         args.AggregateResults = datasourceResult.AggregateResults;

knowledge-base/grid-custom-grouping-order.md

@@ -95,7 +95,7 @@ To achieve custom grouping order in the Telerik Grid for Blazor, follow these st
 			List<string> customOrder = new List<string> { "Text D", "Text A", "Text C", "Text B" };
 			groups = groups.OrderBy(group => customOrder.IndexOf(group.Key.ToString())).ToList();
 
-			args.Data = groups.Cast<object>().ToList();
+			args.Data = groups;
 		}
 		else
 		{
@@ -104,7 +104,7 @@ To achieve custom grouping order in the Telerik Grid for Blazor, follow these st
 								.OrderBy(Text => GetCustomOrderIndex(Text.S1))
 								.ToList();
 
-			args.Data = orderedData.Cast<object>().ToList();
+			args.Data = orderedData;
 		}
 
 		args.Total = datasourceResult.Total;