| Mil gracias por contestar, lo he intentado usando un DataTable, pero me va muy lento y no me funciona, pongo el código por si veis algo raro:
Public Sub PruebasNacidos()
Dim linea As String
Dim anno As String
Dim region As String
Dim estado_civil As String
Dim edad As String
Dim orden As String
Dim dt As New DataTable
Dim srLector2 As StreamReader = New StreamReader(archivo)
linea = srLector2.ReadLine()
Do While Not (linea = Nothing)
LecturaDatosNacimiento(linea, anno, region, estado_civil, edad, orden, contador)
ActualizarTabla(anno, region, estado_civil, edad, orden, dt)
linea = srLector2.ReadLine()
Loop
ActualizarBaseDeDatos(dt, "Nacidos")
MsgBox("El proceso se ha realizado con éxito")
End Sub
Public Sub ActualizarBaseDeDatos(ByRef dt As DataTable, ByVal tableName As String)
Dim dts As New DataSet("Nacidos")
Dim nuevo_data As New getDataset
dts.Tables.Add(dt)
nuevo_data.dts2db2(dts, tableName)
End Sub
Public Sub ActualizarTabla(ByVal anno As String, ByVal region As String, ByVal estado_civil As String, ByVal edad As String, _
ByVal orden As String, ByRef dt As DataTable)
Dim str As String, valor
str = "Anno = '" & anno & "'"
str &= " AND Provincia = '" & region & "'"
str &= " AND Estado = '" & estado_civil & "'"
str &= " AND Edad = '" & edad & "'"
Dim rows() As DataRow = dt.Select(str)
If rows.Length() > 0 Then
Exit Sub
Dim r As DataRow
r = rows(0)
Select Case orden
Case " 1", "1 ", "01"
r.BeginEdit()
r("Orden1") = r(4) + 1
r("Total") = r(9) + 1
r.EndEdit()
dt.AcceptChanges()
Case " 2", "2 ", "02"
r.BeginEdit()
r("Orden2") = r(5) + 1
r("Total") = r(9) + 1
r.EndEdit()
dt.AcceptChanges()
Case " 3", "3 ", "03"
r.BeginEdit()
r("Orden3") = r(6) + 1
r("Total") = r(9) + 1
r.EndEdit()
dt.AcceptChanges()
Case " 4", "4 ", "04"
r.BeginEdit()
r("Orden4") = r(7) + 1
r("Total") = r(9) + 1
r.EndEdit()
dt.AcceptChanges()
Case Else
r.BeginEdit()
r("Orden5") = r(8) + 1
r("Total") = r(9) + 1
r.EndEdit()
dt.AcceptChanges()
End Select
'Añadimos
Else
Dim Nrows As DataRow
Nrows = dt.NewRow()
Nrows("Anno") = anno
Nrows("Provincia") = region
Nrows("Edad") = edad
Nrows("Estado") = estado_civil
Nrows("Orden1") = 0
Nrows("Orden2") = 0
Nrows("Orden3") = 0
Nrows("Orden4") = 0
Nrows("Orden5") = 0
Select Case orden
Case " 1", "1 ", "01"
Nrows("Orden1") = 1
Nrows("Total") = 1
Case " 2", "2 ", "02"
Nrows("Orden2") = 1
Nrows("Total") = 1
Case " 3", "3 ", "03"
Nrows("Orden3") = 1
Nrows("Total") = 1
Case " 4", "4 ", "04"
Nrows("Orden4") = 1
Nrows("Total") = 1
Case Else
Nrows("Orden5") = 1
Nrows("Total") = 1
End Select
dt.Rows.Add(Nrows)
End If
End Sub
ublic Function dts2db(ByVal dts As DataSet, ByVal tablename As String)
'Dim sSel As String = "INSERT INTO _TEF(anno,region,edad1,edad2,orden,valor) FROM _TEF"
Dim sSel As String = "SELECT * FROM " & tablename & " ORDER BY anno"
Dim dbDataAdapter As OleDbDataAdapter
connect()
' Crear un nuevo objeto del tipo DataAdapter
dbDataAdapter = New OleDbDataAdapter(sSel, conn)
' Crear los comandos de insertar, actualizar y eliminar
Dim cb As New OleDbCommandBuilder(dbDataAdapter)
dbDataAdapter.MissingSchemaAction = MissingSchemaAction.AddWithKey
Try
dbDataAdapter.Update(dts, tablename)
Catch ex As System.InvalidOperationException
MsgBox(ex.ToString)
Exit Function
Catch ex As System.Data.OleDb.OleDbException
MsgBox("Debe cerrar todas las aplicaciones Access")
MsgBox(ex.ToString)
Exit Function
End Try
dts.AcceptChanges()
End Function | 
