Question about Restore database from C# Winapp

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SQL-Server-2005

C#

.NET

, +

I've try to make Restore and backup database function on my program

and I've use code on this link to based of my backup/restore my project for testing

SqlServer Backup/Restore Utility[^]

I've Load Program demo from link and it's can backup and restore my database as well

When I've copy source to my project function Back up is ok. I can backup my database as well

but when i've try to restore i've got ERROR "Restore failed for Server 'PETCHYPC-pc\sqlexpress'"

I just already change my connection string yet but why I've got this problem

this's my code

Database restoreDb = (Database)cmbRestoreDb.SelectedItem;
dbName = restoreDb.Name;

Restore dbRestore = new Restore();
dbRestore.Database = restoreDb.Name;
dbRestore.Action = RestoreActionType.Database;
dbRestore.ReplaceDatabase = true;

string fileLocation = ConfigurationManager.AppSettings["SqlFileLocations"];

try
{
    BackupDeviceItem device = new BackupDeviceItem(openBakFile.FileName, DeviceType.File);
    dbRestore.Devices.Add(device);
    DataTable dtFiles = dbRestore.ReadFileList(sqlServer);
    string backupDbLogicalName = dtFiles.Rows[0]["LogicalName"].ToString();

    RelocateFile dbRf = new RelocateFile(backupDbLogicalName, string.Format("{0}\\{1}.mdf", fileLocation, dbName));
    RelocateFile logRf = new RelocateFile(string.Format("{0}_log", backupDbLogicalName), string.Format("{0}\\{1}_Log.ldf", fileLocation, dbName));
    dbRestore.RelocateFiles.Add(dbRf);
    dbRestore.RelocateFiles.Add(logRf);

    string sql = string.Empty;
    StringCollection scriptColl = dbRestore.Script(sqlServer);
    foreach (string str in scriptColl)
    {
        sql += str;
    }

    progress2.Visible = true;
    progress2.Value = 0;

    dbRestore.Complete += new ServerMessageEventHandler(dbRestore_Complete);
    dbRestore.PercentComplete += new PercentCompleteEventHandler(PercentComplete2);
    dbRestore.SqlRestore(sqlServer);
}
catch (Exception exc)
{
    dbRestore.Abort();
    MessageBox.Show(string.Format("Exception occured.\nMessage: {0}", exc.Message));

Can anyone to help me

Ps. Sorry for my English . Now I've practice to use it