private void Form1_Load(object sender, EventArgs e)
        {
          OleDbConnection cn= new  OleDbConnection(report.Properties.Settings.Default.fotoConnectionString);
          cn.Open();
          OleDbCommand cmd = new OleDbCommand();
          OleDbDataReader dr ;
          cmd.CommandText = "Select * From qFoto where Costruzione = ?";
          cmd.Connection = cn;
          cmd.Parameters.Add("@Costruzione", OleDbType.LongVarChar);
          cmd.Parameters["@Costruzione"].Value = textBox1.Text;
          dr=cmd.ExecuteReader();
          DataTable dt = new DataTable();
          dt.Load(dr);
          MessageBox.Show(dt.Rows.Count.ToString());
          DataSet ds = new DataSet();
          ds.Tables.Add(dt);
          OleDbDataAdapter da = new OleDbDataAdapter();
          da.SelectCommand = cmd;
          da.Fill(ds.Tables[0]);
          dataGridView1.DataSource = ds.Tables[0];
}