just to let you know there is a slight error in the help file:
Retrieving primary key field values for items
ms-help://telerik.radgrid.35.Net2/telerik.radgrid.35.Net2/grdRetrievePrimaryKeyFieldValuesForItems.html
under the C# code sample, the reference to: e.Item.OwnerTable.DataKeyValues is used as a method where DataKeyValues is a property, so it should be followed by [...] brackets rather than (...). not a major issue, thought you might want to correct it for next release.
Retrieving primary key field values for items
ms-help://telerik.radgrid.35.Net2/telerik.radgrid.35.Net2/grdRetrievePrimaryKeyFieldValuesForItems.html
under the C# code sample, the reference to: e.Item.OwnerTable.DataKeyValues is used as a method where DataKeyValues is a property, so it should be followed by [...] brackets rather than (...). not a major issue, thought you might want to correct it for next release.