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DataTable: Finding Differences in Column Values

I have two tables in a typed DataSet and I want to compare one column in each table to see if TableA has values that are not in TableB.

IEnumerable<string> valuesInA = typedDataSet.TableA.AsEnumerable().Select(row => row.AField);
IEnumerable<string> valuesInB = typedDataSet.TableB.AsEnumerable().Select(row => row.BField);
 
foreach (var notInB in valuesInA.Except(valuesInB))
    Debug.WriteLine(string.Format("Value not in TableB.BField: {0}", notInB));

This is assuming that both AField and BField are the same type.
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