how to backup and restore sql server database

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.Threading;
using Microsoft.Win32;
using Microsoft.SqlServer.Management.Common;
using Microsoft.SqlServer.Management.Smo;
using System.Data.SqlClient;
namespace TIM_System_Backup
{
    public partial class frmBackup : Form
    {
        SqlConnection connections = new SqlConnection(@"");
        Server srv;
        ServerConnection conn;
        public frmBackup()
        {
            InitializeComponent();
        }

        private void frmBackup_Load(object sender, EventArgs e)
        {
            RegistryKey rk = Registry.LocalMachine.OpenSubKey(@"SOFTWARE\Microsoft\Microsoft SQL Server");
            String[] instances = (String[])rk.GetValue("InstalledInstances");
            if (instances.Length > 0)
            {
                foreach (String element in instances)
                {
                    if (element == "MSSQLSERVER")
                        lstLocalInstances.Items.Add(System.Environment.MachineName);
                    else
                        lstLocalInstances.Items.Add(System.Environment.MachineName + @"\" + element);
                }
            }

            Thread threadGetNetworkInstances = new Thread(GetNetworkInstances);
            threadGetNetworkInstances.Start();
        }
        private void txtFileName_TextChanged(object sender, EventArgs e)
        {

        }

        public void ProgressEventHandler(object sender, PercentCompleteEventArgs e)
        {
            this.progressBar1.Value = e.Percent;
        }

        delegate void SetMessageCallback(string text);

        private void AddNetworkInstance(string text)
        {
            if (this.lstNetworkInstances.InvokeRequired)
            {
                SetMessageCallback d = new SetMessageCallback(AddNetworkInstance);
                this.BeginInvoke(d, new object[] { text });
            }
            else
            {
                this.lstNetworkInstances.Items.Add(text);
            }
        }

        private void GetNetworkInstances()
        {
            DataTable dt = SmoApplication.EnumAvailableSqlServers(false);

            if (dt.Rows.Count > 0)
            {
                foreach (DataRow dr in dt.Rows)
                {
                    AddNetworkInstance(dr["Name"].ToString());
                }
            }
        }

        private void btnConnect_Click_1(object sender, EventArgs e)
        {
            
        }

        private void btnBrowse_Click_1(object sender, EventArgs e)
        {
           
        }

        private void btnBackupDB_Click_1(object sender, EventArgs e)
        {
           
        }

        private void btnRestore_Click_1(object sender, EventArgs e)
        {
           
        }

        private void btnBackupLog_Click_1(object sender, EventArgs e)
        {
            Backup bkp = new Backup();

            Cursor = Cursors.WaitCursor;
            dataGridView1.DataSource = "";

            try
            {
                string strFileName = txtFileName.Text.ToString();
                string strDatabaseName = txtDatabase.Text;

                bkp.Action = BackupActionType.Log;
                bkp.Database = strDatabaseName;

                bkp.Devices.AddDevice(strFileName, DeviceType.File);
                progressBar1.Value = 0;
                progressBar1.Maximum = 100;
                progressBar1.Value = 10;

                bkp.PercentCompleteNotification = 10;
                bkp.PercentComplete += new PercentCompleteEventHandler(ProgressEventHandler);

                bkp.SqlBackup(srv);
                MessageBox.Show("Log Backed Up To: " + strFileName, "SMO Demos");
            }
            catch (SmoException exSMO)
            {
                MessageBox.Show(exSMO.ToString());

            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.ToString());
            }

            finally
            {
                Cursor = Cursors.Default;
                progressBar1.Value = 0;
            }
        }

        private void btnVerify_Click_1(object sender, EventArgs e)
        {
           
        }

        private void lstLocalInstances_SelectedIndexChanged(object sender, EventArgs e)
        {

        }

        private void btnConnect_Click(object sender, EventArgs e)
        {
            //try
            //{
                //ddlDatabase.Items.Clear();

                string sqlSErverInstance;

                if (this.tabServers.SelectedIndex == 0)
                {
                    sqlSErverInstance = lstLocalInstances.SelectedItem.ToString();
                }
                else
                {
                    sqlSErverInstance = lstNetworkInstances.SelectedItem.ToString();
                }

                if (chkWindowsAuthentication.Checked == true)
                {
                    conn = new ServerConnection();
                    conn.ServerInstance = sqlSErverInstance;
                }
                else
                {
                    conn = new ServerConnection(sqlSErverInstance, txtLogin.Text, txtPassword.Text);
                }
                srv = new Server(conn);

                //foreach (Database db in srv.Databases)
                //{
                //    ddlDatabase.Items.Add(db.Name);
                //}
                txtDatabase.Text = "CONTACTMANAGEMENTSYSTEM.MDF";
            //}
            //catch (Exception err)
            //{
            //    MessageBox.Show("Failed to connect");
            //    Console.WriteLine(err);
            //}
        }

        private void btnBackupDB_Click(object sender, EventArgs e)
        {
            Backup bkp = new Backup();

            this.Cursor = Cursors.WaitCursor;
            this.dataGridView1.DataSource = string.Empty;
            //try
            //{
                string fileName = this.txtFileName.Text;
                string databaseName = this.txtDatabase.Text;

                bkp.Action = BackupActionType.Database;
                bkp.Database = databaseName;
                bkp.Devices.AddDevice(fileName, DeviceType.File);
                bkp.Incremental = chkIncremental.Checked;
                this.progressBar1.Value = 0;
                this.progressBar1.Maximum = 100;
                this.progressBar1.Value = 10;

                bkp.PercentCompleteNotification = 10;
                bkp.PercentComplete += new PercentCompleteEventHandler(ProgressEventHandler);

                bkp.SqlBackup(srv);
                MessageBox.Show("Database Backed Up To: " + fileName, "SMO Demos");
            //}

            //catch (Exception ex)
            //{
            //    MessageBox.Show(ex.ToString());
            //}
            //finally
            //{
            //    this.Cursor = Cursors.Default;
            //    this.progressBar1.Value = 0;
            //}
        }