Unable to update DataGridView

Ok, I can try to do like you suggest, but my problem was one step before.
I saw in debug that the dataTable Selezione is filled but not displayed in the DataGridView.
I canceled DataSource completely and re-add to the project Binded DataGridView to the Selezione DataTable and now the data are displayed

Thanks

My code is :
 private void Sceltainf_Click(object sender, EventArgs e)
        {
            valvoleDataSet.Tables["Selezione"].Clear();//Cancello la Tabella Selezione
            int k=0;
            foreach (DataRow row in valvoleDataSet.Valvole.Rows)
            {
                valvoleDataSet.Selezione.ImportRow(valvoleDataSet.Valvole.Rows[k]);
                selezioneTableAdapter.Update(valvoleDataSet.Selezione);
                k++;
            }
                         dbGridView.AutoResizeColumns(DataGridViewAutoSizeColumnsMode.AllCells);
}