BackUp Device in C# .Net

//Backup class allow programmatic access to sql server backup
Backup db_bk = new Backup();
db_bk.Action = BackupActionType.Database;
db_bk.Database = cmbDatabase.SelectedItem.ToString();

//BackupDeviceItem class allow to programmatic access to Named Sql server backup devices.
BackupDeviceItem bkitem = new BackupDeviceItem(sfd.FileName, DeviceType.File);
db_bk.Devices.Add(bkitem);
db_bk.SqlBackup(srv);
}
}
else
{
MessageBox.Show("A connection to a SQL server was not established.", "Not Connected to Server", MessageBoxButtons.OK, MessageBoxIcon.Exclamation);
}
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
}

}

//btnrestore button to restore a database into last backup state

private void btnrestore_Click(object sender, EventArgs e)
{
try
{
OpenFileDialog ofd = new OpenFileDialog();
if (srv != null)
{
ofd.Title = "Restore BackUp...";
ofd.Filter = "Backup File|*.bak";
if (ofd.ShowDialog() == DialogResult.OK)
{

//Restore class allow programatic access to sql server resoter operations.
Restore re_db = new Restore();

//RestoreActionType allow us to take which part restoration like database resote or files restore etc....
re_db.Action = RestoreActionType.Database;
re_db.Database = cmbDatabase.SelectedItem.ToString();

//BackupDeviceItem class aloow programatic acces to named sql server resotre operation
BackupDeviceItem bk_item = new BackupDeviceItem(ofd.FileName, DeviceType.File);
re_db.Devices.Add(bk_item);
re_db.ReplaceDatabase = true;
re_db.SqlRestore(srv);
}
}
else
{
MessageBox.Show("A connection to a SQL server was not established.", "Not Connected to Server", MessageBoxButtons.OK, MessageBoxIcon.Exclamation);
}
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
}
}

//form load event

private void Form1_Load(object sender, EventArgs e)
{
//SmoApplication is ava in Management.Smo namespace to list the server that is installed on machine
DataTable dt = SmoApplication.EnumAvailableSqlServers(true);
if (dt.Rows.Count > 0)
{
// Loop through each server in the DataTable
foreach (DataRow dr in dt.Rows)
{
cmbsrv_name.Items.Add(dr["Name"]);
}
}
}
}
}