// Namespaces, variables, and constants
using System;
using System.Configuration;
using System.Data;
using System.Data.Odbc;
private void CButton_Click(object sender, System.EventArgs e)
{
    // Create the DataAdapter.
    String sql = "SELECT ID, Name FROM Products";
    OdbcDataAdapter da = new OdbcDataAdapter(sql,ConfigurationSettings.AppSettings["connectionstring1"]);
    // Create the table, fill it, and bind the default view to the grid.
    DataTable dt = new DataTable( );
    da.Fill(dt);
}