How to backup oracle database using C# application

private void btnBackupDB_Click(object sender, EventArgs e)
{
    //## Settings
    //Path to store the oracle dump
    string path = @"C:\backup";
    string backupFileName = "mybackup.dmp";
    //your ORACLE_HOME enviroment variable must be setted or you need to set the path here:
    string oracleHome = Environment.GetEnvironmentVariable("ORACLE_HOME");
    string oracleUser = "sys";
    string oraclePassword = "abc";
    string oracleSID = "xe";
    //###

    ProcessStartInfo psi = new ProcessStartInfo();

    //Exp is the tool used to export data.
    //this tool is inside $ORACLE_HOME\bin directory
    psi.FileName = Path.Combine(oracleHome, "bin", "exp");
    psi.RedirectStandardInput = false;
    psi.RedirectStandardOutput = true;
    string dumpFile = Path.Combine(path, backupFileName);
    //The command line is: exp user/password@database file=backupname.dmp [OPTIONS....]
    psi.Arguments = string.Format(oracleUser + "/" + oraclePassword + "@" + oracleSID + " FULL=y FILE=" + dumpFile);
    psi.UseShellExecute = false;

    Process process = Process.Start(psi);
    process.WaitForExit();
    process.Close();
    MessageBox.Show("Database Backup Completed Successfully");
    this.Close();

}