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Counts the number of results from a query.

'Assembly: System.Core.dll
'Namespace: System.Linq
'Dim queryResult AS item
'Dim item AS item
'Dim dataSource AS String
'Dim field1 AS String
'Dim field2 AS String

        Dim queryResult = From item In dataSource _
                    Select item.field1, item.field2                    
                 Dim count = queryResult.Count