LINQ over untyped DataSets

This example comes from the AppDev (Exploring Visual Studio 2008 Using Visual C#)

DataSetr ds = FillDataset();
DataTable customerTable = ds.Tables["Customers"];

// DataTable does not implement IEnumerable
var cutomers = from c in customerTable.AsEnumerable()
               where c.Field("Country") == "USA"
               select new 
               {
                   CustomerID = c.Field("CustomerID"),
                   ContractName = c.Field("ContractName")
               {;