Handle network exceptions : Web Client « Network « C# / C Sharp

Handle network exceptions

Handle network exceptions
C#: The Complete Reference 
by Herbert Schildt 

Publisher: Osborne/McGraw-Hill (March 8, 2002)
ISBN: 0072134852

// Handle network exceptions. 
using System; 
using System.Net; 
using System.IO; 
public class NetExcDemo {  
  public static void Main() { 
    int ch; 
    try { 
      // First, create a WebRequest to a URI. 
      HttpWebRequest req = (HttpWebRequest) 
      // Next, send that request and return the response. 
      HttpWebResponse resp = (HttpWebResponse) 
      // From the response, obtain an input stream. 
      Stream istrm = resp.GetResponseStream(); 
      /* Now, read and display the html present at 
         the specified URI.  So you can see what is 
         being displayed, the data is shown 
         400 characters at a time.  After each 400 
         characters are displayed, you must press 
         ENTER to get the next 400. */ 
      for(int i=1; ; i++) { 
        ch =  istrm.ReadByte(); 
        if(ch == -1) break; 
        Console.Write((char) ch); 
        if((i%400)==0) { 
          Console.Write("\nPress a key."); 
      // Close the Response. This also closes istrm. 
    } catch(WebException exc) { 
      Console.WriteLine("Network Error: " + exc.Message +  
                        "\nStatus code: " + exc.Status); 
    } catch(ProtocolViolationException exc) { 
      Console.WriteLine("Protocol Error: " + exc.Message); 
    } catch(UriFormatException exc) { 
      Console.WriteLine("URI Format Error: " + exc.Message); 
    } catch(NotSupportedException exc) { 
      Console.WriteLine("Unknown Protocol: " + exc.Message); 
    } catch(IOException exc) { 
      Console.WriteLine("I/O Error: " + exc.Message); 


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