关于media player 的相关问题

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.IO;namespace 听力练习播放器
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }        string filename;        string fullpath;
        string alltime;
        string currenttime;
        private void 打开ToolStripMenuItem_Click(object sender, EventArgs e)
        {
            OpenFileDialog openfile = new OpenFileDialog();
            openfile.InitialDirectory = "D:\\歌曲";
            openfile.ShowDialog();            filename = openfile.FileName;
            fullpath = Path.GetFullPath(filename);
            this.axWindowsMediaPlayer1.URL = fullpath;
            axWindowsMediaPlayer1.Ctlcontrols.play();
            alltime = this.axWindowsMediaPlayer1.currentMedia.durationString;            this.time_all.Text = alltime;            this.namesong.Text  = this.axWindowsMediaPlayer1.currentMedia.name;           currenttime = this.axWindowsMediaPlayer1.currentMedia.duration.ToString();
           
         
        }
           
        private void Form1_Load(object sender, EventArgs e)
        {
            this.namesong.Text="";
            this.time_all.Text = "";
            this.time_now.Text="";        }        private void menuStrip1_ItemClicked(object sender, ToolStripItemClickedEventArgs e)
        {        }
        
    }
}这个 里我要获取歌曲的总时间，用的是
alltime = this.axWindowsMediaPlayer1.currentMedia.durationString;这个方法怎么没有生效
还有就是
这个控件的一些音量调节按钮和可否去掉，
我想编写当前播放进度的代码，需要TIMER控件吗