How do I.. bind drop down list from Sql Server 2008 in c# in windows application

using System; 
using System.Collections.Generic; 
using System.ComponentModel; 
using System.Data; 
using System.Drawing; 
using System.Linq; 
using System.Text; 
using System.Windows.Forms; 
using System.Data.SqlClient; 
namespace BindComboBox 
{ 
public partial class Form1 : Form 
{ 
public Form1() 
{ 
InitializeComponent(); 
} 
private void Form1_Load(object sender, EventArgs e)
 { 
loadCountry();
 } 
public void loadCountry() 
{ 
DataTable dt = new DataTable(); 
try 
{ 
using (SqlConnection con = new SqlConnection("Data Source = testdb;Initial Catalog = ABC;Uid = sa;Password = PassWord123;")) 
{ 
using (SqlDataAdapter adp = new SqlDataAdapter("SELECT * FROM country", con)) 
{
 adp.Fill(dt); 
comboBox1.DisplayMember = "Country"; 
comboBox1.ValueMember = "Id"; 
comboBox1.DataSource = dt; 
} 
} 
} 
catch (Exception ex) 
{ 
throw ex; 
} 
} 
} 
}