creating back up of database

Hi all

I had created a website and i am able to get backup of database on local system by this code

 protected void ImageBackup_Click(object sender, ImageClickEventArgs e)
    {
        DatabaseBackup("C:/Program Files/MySQL/MySQL Server 5.5/bin/mysqldump.exe", "newpos");
        ClientScript.RegisterStartupScript(this.GetType(), "Key", "alert('Back up has been Successfully created on desktop')", true);
    } public void DatabaseBackup(string ExeLocation, string DBName)
    {
        try
        {
            string tmestr = "";
            tmestr = DBName + "-" + DateTime.Now.ToShortDateString() + ".sql";
            tmestr = tmestr.Replace("/", "-");
            tmestr = Environment.GetFolderPath(Environment.SpecialFolder.Desktop) + "\\" + tmestr;
            StreamWriter file = new StreamWriter(tmestr);
            ProcessStartInfo proc = new ProcessStartInfo();
            string cmd = string.Format(@"-u{0} -p{1} -h{2} {3}", "root", "root", "localhost", DBName);
            proc.FileName = ExeLocation;
            proc.RedirectStandardInput = false;
            proc.RedirectStandardOutput = true;
            proc.Arguments = cmd;
            proc.UseShellExecute = false;
            Process p = Process.Start(proc);
            string res;
            res = p.StandardOutput.ReadToEnd();
            file.WriteLine(res);
            p.WaitForExit();
            file.Close();
        }
        catch (IOException ex)
        {

        }
    }

but when i'm creating back up from website then i'm not able to create backup

so please guide me in creating backup

thanks in advance