.NET error - Join of row.ItemArray in DataTable

I have some data in a DataTable.  I want to write it to a tab delimited file.

In the following code I am getting this error on the Join command:
System.ArgumentException: Argument 'SourceArray' cannot be converted to type 'String'.

I am using VS 2008 and .NET 2.0.  Thanks for any ideas.

Dim row As DataRow
Using sOut As New StreamWriter(tabFileName)
       For Each row In dt.Rows
               sOut.WriteLine(Join(row.ItemArray, vbTab))
        Next
End Using

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