How to take sql server database backup and restore it through vb.net code?

Dim oDevice As New SQLDMO.BackupDevice
Dim BACKUP As New SQLDMO.BACKUP
Dim SERVER As New SQLServer

Private Sub Form_Load()
On Error Resume Next 'If the device already exists an error will result if you try to add it again so just resume next cos its already there

With oDevice
  .Type = SQLDMODevice_DiskDump
  .Name = "MyDBBackup"
  .PhysicalLocation = "C:\\BACKUP.bak"
End With

SERVER.Connect "sa", ""
SERVER.BackupDevices.Add oDevice
BACKUP.Action = SQLDMOBackup_Database
BACKUP.Database = "MYDB"
BACKUP.Devices ="MyDBBackup"
BACKUP.BackupSetDescription = "Full BackUp"
BACKUP.BackupSetName = "testbackup"

BACKUP.SQLBackup SERVER

End Sub

using Microsoft.SqlServer.Management.Smo;
using Microsoft.SqlServer.Management.Common;

public partial class BackupDatabase : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {

    }
    protected void Button1_Click(object sender, EventArgs e)
    {
        BackupSqlDatabase("YourDataBaseName", "sa", "password", "ServerName", "C:\\YourDataBaseName.bak");
    }

    public void BackupSqlDatabase(String databaseName, String userName, String password, String serverName, String destinationPath)
    {
        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);
    }
}

public void RestoreSqlDatabase(String databaseName, String filePath, String serverName, String userName, String password, String dataFilePath, String logFilePath)
    {
        try
        {
            Microsoft.SqlServer.Management.Smo.Restore sqlRestore = new Microsoft.SqlServer.Management.Smo.Restore();

            Microsoft.SqlServer.Management.Smo.BackupDeviceItem deviceItem = new Microsoft.SqlServer.Management.Smo.BackupDeviceItem(filePath, Microsoft.SqlServer.Management.Smo.DeviceType.File);
            sqlRestore.Devices.Add(deviceItem);
            sqlRestore.Database = databaseName;

            Microsoft.SqlServer.Management.Common.ServerConnection connection = new Microsoft.SqlServer.Management.Common.ServerConnection(serverName, userName, password);
            Microsoft.SqlServer.Management.Smo.Server sqlServer = new Microsoft.SqlServer.Management.Smo.Server(connection);

            Microsoft.SqlServer.Management.Smo.Database db = sqlServer.Databases[databaseName];
            sqlRestore.Action = Microsoft.SqlServer.Management.Smo.RestoreActionType.Database;
            String dataFileLocation = dataFilePath + databaseName + ".mdf";
            String logFileLocation = logFilePath + databaseName + "_Log.ldf";
            db = sqlServer.Databases[databaseName];
            Microsoft.SqlServer.Management.Smo.RelocateFile rf = new Microsoft.SqlServer.Management.Smo.RelocateFile(databaseName, dataFileLocation);

            sqlRestore.RelocateFiles.Add(new Microsoft.SqlServer.Management.Smo.RelocateFile(databaseName, dataFileLocation));
            sqlRestore.RelocateFiles.Add(new Microsoft.SqlServer.Management.Smo.RelocateFile(databaseName + "_log", logFileLocation));
            sqlRestore.ReplaceDatabase = true;
            sqlRestore.Complete += new Microsoft.SqlServer.Management.Common.ServerMessageEventHandler(sqlRestore_Complete);
            sqlRestore.PercentCompleteNotification = 10;
            sqlRestore.PercentComplete += new Microsoft.SqlServer.Management.Smo.PercentCompleteEventHandler(sqlRestore_PercentComplete);

            sqlRestore.SqlRestore(sqlServer);

            db = sqlServer.Databases[databaseName];

            db.SetOnline();

            sqlServer.Refresh();
        }
        catch (Exception ex)
        {
            Response.Write(ex.Message);
        }
    }

using System;
using System.Configuration;
using System.Data;
 
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Data.SqlClient;

public partial class _Default : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        SqlConnection con = new SqlConnection(@"server=Servername;uid=sa;password=sasa;database=databasename");
        con.Open();
        string strpath="backup database databasename to disk='D:\\Reminders\\'" + DateTime.Now.Date.ToString() + "'.bak'";

        SqlCommand cmd = new SqlCommand(strpath, con);
        cmd.ExecuteNonQuery();


    }
}