อยากทราบการทำการสำรองข้อมูล (Backup Restore ) ด้วย C# + SQL Server 2005 ทำยังไงคะ ช่วยด้วยนะคะ

private void btnBack_Click(System.Object sender, System.EventArgs e)
{
	string strSQL = null;
	string strCon = null;
	strCon = "Data Source=NITHI;Initial Catalog=master;Integrated Security=True";
	System.Data.SqlClient.SqlCommand cmdBackup = new System.Data.SqlClient.SqlCommand();
	SqlConnection1.ConnectionString = strCon;
	SqlConnection1();
	Cursor = Cursors.WaitCursor;
	try {
		strSQL = "BACKUP DATABASE Northwind ";
		strSQL += "TO DISK = 'C:\\mybackup.bak' ";
		strSQL += "WITH FORMAT, ";
		strSQL += "NAME = 'myBackup'";
		cmdBackup.Connection = SqlConnection1;
		cmdBackup.CommandText = strSQL;
		cmdBackup.ExecuteNonQuery();
		Interaction.MsgBox("finish");
	} catch (Exception ex) {
		Interaction.MsgBox("Error");
	}

	Cursor = Cursors.Arrow;
	SqlConnection1.Close();
	cmdBackup.Dispose();
	cmdBackup = null;

}

SqlConnection1 = new SqlConnection;

SqlConnection1 = new SqlConnection();