Consider the following code

    Public Sub testDatarows()
        Dim oDt As New DataTable
        oDt.Columns.Add("Field1", GetType(String))
        oDt.Columns.Add("Field2", GetType(String))
        oDt.Columns.Add("Field3", GetType(String))
        Dim odr As DataRow = oDt.NewRow
        odr("Field1") = "value 1"
        odr("Field2") = "value 2"
        odr("Field3") = "value 3"
        oDt.Rows.Add(odr)
        odr("Field3") = "value 4"
        oDt.Rows.Add(odr)
        For Each odr In oDt.Rows
            Debug.Print(odr("Field1") & "- " & odr("field2") & "-" & odr("Field3"))
        Next
    End Sub

It breaks at the second

oDt.Rows.Add(odr)

throwing an exception : {"This row already belongs to this table."}

Is there a way around this besides issuing a new

 odr = oDt.NewRow

and copy and pasting the assignments of the two first fields?