C# MediaPlayer

 using System.Windows.Media;
 using Newtonsoft.Json;
 using System.ComponentModel;

 namespace ConsoleApp378
 {
     class Program:INotifyPropertyChanged
     {
         static void Main(string[] args)
         {
             Program obj = new Program();
             obj.MediaPlayerDemo();
             Console.ReadLine();
         }

         static MediaPlayer mp3Player = new MediaPlayer();
         void MediaPlayerDemo()
         {
             string mp3Path = Directory.GetCurrentDirectory() + @"\MediaResource\StarSky.mp3";
             mp3Player.Open(new Uri(mp3Path));
             mp3Player.MediaEnded += Mp3Player_MediaEnded;
             Console.WriteLine(" Start:Y;Exit:Q;Amplify:A;Decrease:D;Pause:P;C:Acclerate;R:Replay from begining!");
             string line;
             while ((line = Console.ReadLine()) != null)
             {
                 ControlMediaPlayer(line[]);
             }
         }

         private bool isMP3PlayerCompleted = false;

         public event PropertyChangedEventHandler PropertyChanged;
         private void OnPropertyChanged(string propName)
         {
             if(PropertyChanged!=null)
             {
                 PropertyChanged(this, new PropertyChangedEventArgs(propName));
             }
         }

         public bool ISMP3PlayerCompleted
         {
             get
             {
                 return isMP3PlayerCompleted;
             }
             set
             {
                 if(value!=isMP3PlayerCompleted)
                 {
                     isMP3PlayerCompleted = value;
                     OnPropertyChanged("ISMP3PlayerCompleted");
                 }

                 if(isMP3PlayerCompleted)
                 {
                     MessageBox.Show("Finished!");
                 }
             }
         }
         private  void Mp3Player_MediaEnded(object sender, EventArgs e)
         {
             ISMP3PlayerCompleted = true;
         }

         void ControlMediaPlayer(char c)
         {
             if (mp3Player != null && mp3Player.HasAudio)
             {
                 string jsonContent = "";
                 switch (c)
                 {
                     //Start
                     case 'Y':
                         mp3Player.Play();
                         jsonContent = JsonConvert.SerializeObject(mp3Player, Formatting.Indented);
                         ShowMsg(jsonContent);
                         break;

                     //Exit
                     case 'Q':
                         mp3Player.Stop();
                         jsonContent = JsonConvert.SerializeObject(mp3Player, Formatting.Indented);
                         ShowMsg(jsonContent);
                         break;

                     //Amplify
                     case 'A':
                         mp3Player.Volume = mp3Player.Volume + 0.1;
                         jsonContent = JsonConvert.SerializeObject(mp3Player, Formatting.Indented);
                         ShowMsg(jsonContent);
                         break;

                     //Decrease
                     case 'D':
                         mp3Player.Volume = mp3Player.Volume - 0.1;
                         jsonContent = JsonConvert.SerializeObject(mp3Player, Formatting.Indented);
                         ShowMsg(jsonContent);
                         break;

                     //Pause
                     case 'P':
                         mp3Player.Pause();
                         jsonContent = JsonConvert.SerializeObject(mp3Player, Formatting.Indented);
                         ShowMsg(jsonContent);
                         break;

                     //Accelerate
                     case 'C':
                         mp3Player.SpeedRatio += 0.3;
                         jsonContent = JsonConvert.SerializeObject(mp3Player, Formatting.Indented);
                         ShowMsg(jsonContent);
                         break;

                     case 'L':
                         mp3Player.SpeedRatio -= 0.3;
                         jsonContent = JsonConvert.SerializeObject(mp3Player, Formatting.Indented);
                         ShowMsg(jsonContent);
                         break;

                     //Replay
                     case 'R':
                         mp3Player.Position = default(TimeSpan);
                         mp3Player.Play();
                         jsonContent = JsonConvert.SerializeObject(mp3Player, Formatting.Indented);
                         ShowMsg(jsonContent);
                         break;
                 }
             }
         }

         void ShowMsg(string msg)
         {
             Console.WriteLine(msg);
         }
         void ShowStatus(MediaPlayer mPlayer)
         {
             if(mPlayer!=null)
             {
                 string msg = $"Position:{mp3Player.Position},SpeedRatio:{mp3Player.SpeedRatio},IsMuted:{mp3Player.IsMuted}," +
                     $"ScrubbingEnabled:{mp3Player.ScrubbingEnabled},Balance:{mp3Player.Balance},NaturalVideoWidth:{mp3Player.NaturalVideoWidth}"
                     + $"Source:{mp3Player.Source}";
                 Console.WriteLine(msg);
             }
         }
 }