full backup & restor database network with SMO c# sqlserver 2008 or 2012

// add ref
using Microsoft.SqlServer.Management.Smo;
using Microsoft.SqlServer.Management.Smo.Wmi;
using Microsoft.SqlServer.Management.Common;
using Microsoft.SqlServer.Management.Smo.Agent;
using Microsoft.SqlServer.Management.Smo.Broker;
using Microsoft.SqlServer.Management.Smo.Mail;
using Microsoft.SqlServer.Management.Smo.RegisteredServers;
using Microsoft.SqlServer.Management.Trace;
// Connection
SqlConnection sq = new SqlConnection(ClassAccessDatac.con);

// behind code btn
     private void btnBackup_Click(object sender, EventArgs e)
        {
            string MethodeName = "btnBackup_Click";
            try
           {
                 string strFileName = string.Empty;
                
                 saveFileDialog1.DefaultExt = "mdf";
                 saveFileDialog1.FileName = "BackupFile" + un1.OnUniq();
                 saveFileDialog1.Filter = @"SQL Backup files  *.*|All files(*.*) ";
                 saveFileDialog1.FilterIndex = 1;
                 saveFileDialog1.OverwritePrompt = true;
                 saveFileDialog1.Title = "Backup SQL File";
                 if (saveFileDialog1.ShowDialog() == DialogResult.OK)
                 {
                     strFileName = saveFileDialog1.FileName;
                 BackupDatabase("BozorgMehr", "sa", "09124863440", "SERVER001", strFileName);
                   Backup(strFileName);
                 }
             }  
            catch (Exception ex)
             {

              
               Keys.RegError(MethodeName, ex.ToString(), sq);
            }

        
        }
        public Microsoft.SqlServer.Management.Smo.Database db = new Database();

        public void BackupDatabase(String databaseName, String userName,
       String password, String serverName, String destinationPath)
        {
            try{

            Backup sqlBackup = new Backup();

            sqlBackup.Action = BackupActionType.Database;
            sqlBackup.BackupSetDescription = "ArchiveDataBase:" +
                             DateTime.Now.ToShortDateString();
            sqlBackup.BackupSetName = "Archive";

            sqlBackup.Database = databaseName;

            BackupDeviceItem deviceItem = new BackupDeviceItem(destinationPath, DeviceType.File);
            ServerConnection connection = new ServerConnection(serverName, userName, password);
            Server sqlServer = new Server(connection);

            Database db = sqlServer.Databases[databaseName];

            sqlBackup.Initialize = true;
            sqlBackup.Checksum = true;
            sqlBackup.ContinueAfterError = true;

            sqlBackup.Devices.Add(deviceItem);
            sqlBackup.Incremental = false;

            sqlBackup.ExpirationDate = DateTime.Now.AddDays(3);
            sqlBackup.LogTruncation = BackupTruncateLogType.Truncate;

            sqlBackup.FormatMedia = false;

            sqlBackup.SqlBackup(sqlServer);

            }
                 catch (Exception ex)
                {

            
                   Keys.RegError(MethodeName, ex.ToString(), sq);
                }
        }