MediaManagement [C#]

 using System; 
 using System.Collections.Generic; 
 using System.Linq; 
 using System.Text; 
 using System.Windows; 
 using System.Windows.Controls; 
 using System.Windows.Data; 
 using System.Windows.Documents; 
 using System.Windows.Input; 
 using System.Windows.Media; 
 using System.Windows.Media.Imaging; 
 using System.Windows.Navigation; 
 using System.Windows.Shapes; 
 using WpfApplication1.ServiceReference1; 
 using System.Collections.ObjectModel; 
 using System.Net; 
 using Microsoft.Win32; 
 using System.IO; 
  
 namespace WpfApplication1 
 { 
  
     // Interaction logic for MediaManagement.xaml 
     public partial class MediaManagement : UserControl 
     { 
         ServiceSample sample = new ServiceSample(); 
  
         public MediaManagement() 
         { 
             InitializeComponent(); 
         } 
  
         //Initialize the XAML object and retrieve group from server by login 
         public MediaManagement(string login, string password) 
         { 
             InitializeComponent(); 
  
             //Login and retrive group 
             List<View_Group> listResult; 
             sample.GetGroup(out listResult, login, password); 
  
             //Bind group to TreeList 
             treeGroup.ItemsSource = TreeNode.GetTreeNode(listResult); 
         } 
  
         //Select a group and retrive coresponding medias 
         private void treeGroup_SelectedItemChanged(object sender, RoutedPropertyChangedEventArgs<object> e) 
         { 
             //Get Medias for selected group 
             List<View_Media> listResult; 
             sample.GetMedia(out listResult, (treeGroup.SelectedItem as TreeNode).Id ?? 0); 
  
             //Update media thumbnail path 
             listResult.ForEach(x => x.ThumbnailPath = (x.ThumbnailPath != null) ? (GlobalParam.MEDIA_URL + x.ThumbnailPath) : ""); 
  
             //Bind media to List 
             gridMedia.ItemsSource = new ObservableCollection<View_Media>(listResult); 
         } 
  
         //Upload media by packet 
         private void btnUpload_Click(object sender, RoutedEventArgs e) 
         { 
             //Select a media 
             OpenFileDialog openFileDialog = new OpenFileDialog(); 
             openFileDialog.Filter =  
                 "All Files (*.swf, *.swa, *.bmp, *.gif, *.jpg, *.jpeg, *.png, *.avi, *.qt, *.mpg, *.mpeg, *.m1v, *.mp2, *.wmv, *.qt, *.mov, *.mp4, *.m2v, *.3gp, *.3g2, *.divx)|*.swf; *.swa; *.bmp; *.gif; *.jpg; *.jpeg; *.png; *.avi; *.qt; *.mpg; *.mpeg; *.m1v; *.mp2; *.wmv; *.qt; *.mov; *.mp4; *.m2v; *.3gp; *.3g2; *.divx|" + 
                 "Flash Files (*.swf, *.swa)|*.swf; *.swa|" + 
                 "Image Files (*.bmp, *.gif, *.jpg, *.jpeg, *.png)|*.bmp; *.gif; *.jpg; *.jpeg; *.png|" + 
                 "Video files (*.avi, *.qt, *.mpg, *.mpeg, *.m1v, *.mp2, *.wmv, *.qt, *.mov, *.mp4, *.m2v, *.3gp, *.3g2, *.divx)|*.avi; *.qt; *.mpg; *.mpeg; *.m1v; *.mp2; *.wmv; *.qt; *.mov; *.mp4; *.m2v; *.3gp; *.3g2; *.divx"; 
  
             if(openFileDialog.ShowDialog() == true) 
             { 
                 FileInfo fileInfo = new FileInfo(openFileDialog.FileName); 
                 Stream fileStream = fileInfo.OpenRead(); 
  
                 //Create buffer for each packet of media 
                 byte[] buffer = new byte[Math.Min(fileInfo.Length, 4 * 1024 * 1024)]; 
                 int bytesRead = 0; 
  
                 View_Media media = null; 
  
                 bool isFirst = true; bool isLast = false; 
                 while (!isLast) 
                 { 
                     //Read media packet 
                     bytesRead += fileStream.Read(buffer, 0, buffer.Length); 
                     isLast = bytesRead >= fileInfo.Length; 
                      
                     //Send packet to server 
                     sample.UploadMedia(out media, openFileDialog.SafeFileName, (treeGroup.SelectedItem as TreeNode).Id ?? 0, isFirst, isLast, buffer); 
                      
                     isFirst = false; 
                 } 
  
                 //Update media thumbnail path 
                 media.ThumbnailPath = (media.ThumbnailPath != null) ? (GlobalParam.MEDIA_URL + media.ThumbnailPath) : ""; 
                  
                 //Add media to collection 
                 (gridMedia.ItemsSource as ObservableCollection<View_Media>).Add(media); 
             } 
         } 
  
  
         //Delete media 
         private void btnDelete_Click(object sender, RoutedEventArgs e) 
         { 
             sample.DeleteMedia(gridMedia.SelectedItem as View_Media,(treeGroup.SelectedItem as TreeNode).Id ?? 0); 
  
             // for refresh the list 
             treeGroup_SelectedItemChanged(null, null); 
         } 
     } 
 }