Add parameters in oledb and odbc CommandText

OleDb:

using (OleDbCommand cmd = new OleDbCommand())
{
  cmd.CommandText = "Select * from VIP where ID = ? And RegDate >= ?";
  cmd.Parameters.AddWithValue("id", id);
  cmd.Parameters.AddWithValue("regDate", regDate);
  using (OleDbDataReader reader = cmd.ExecuteReader())
  {
    // ..........
  }
}

Odbc:

using (OdbcCommand cmd = new OdbcCommand())
{
  cmd.CommandText = "Select * from VIP where ID = ? And RegDate >= ?";
  cmd.Parameters.Add("id", OdbcType.Int).Value = id;
  cmd.Parameters.Add("regDate", OdbcType.DateTime).Value = regDate;
  using (OdbcDataReader reader = cmd.ExecuteReader())
  {
    // ..........
  }
}

1. The name of parameter doesn't matter, but the order of parameter does.
2. I didn't include full codes here so don't forget to fill in other components like OleDbConnection or OdbcConnection.

Trapping F9 in Winform

private void Form2_KeyDown(object sender, KeyEventArgs e)
{
  if (e.KeyCode == Keys.F9)
  {
    // your work here...
  }
}

1. Use the KeyDown event to trap it.
2. Set the Form's KeyPreview property to True.