Inner Join, Table and speed

Hi group, I’m trying to associate two tables with common ID, and take the fields from both tables. I tried this code, but it’s very very slow… how can I improve it? I need to display all the fields of the two tables based on the ID.

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rows2 = db.SelectSQL("SELECT * from IntestazioneFatturaAcquisti INNER JOIN NominativiDitte ON NominativiDitte.ID=IntestazioneFatturaAcquisti.ID_Nominativo")
While Not Rows2.AfterLastRow
  rows = db.SelectSQL("SELECT * FROM CorpoFatturaAcquisti Where ID_Nominativo="+rows2.column("ID_Nominativo").StringValue+" and  Materiale_Spedito like '%" +Campo1 +"%' and Materiale_Spedito like '%" +Campo2 +"%' order by Materiale_Spedito")
  While Not Rows.AfterLastRow
    ListBoxRicerca.AddRow(rows2.Column("ID_Nominativo").StringValue,rows2.Column("NomeDitta").StringValue.ConvertEncoding(Encodings.WindowsANSI),ConvertDateSQLToItalian(rows2.Column("Data").StringValue).ShortDate,rows2.Column("NumeroFattura").StringValue, rows.Column("Materiale_Spedito").StringValue.ConvertEncoding(Encodings.WindowsANSI))
    rows.MoveToNextRow
  wend
  rows2.MoveToNextRow
Wend

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