Streamwriter problem

(also, if anybody could tell me how to make it so that the code is actually readable, that would be appreciated.

It makes sense when I'm editing it but the final product is a bit messy) 

using System;  
using System.Collections.Generic;  
using System.Linq;  
using System.Text;  
using System.Net;  
using System.IO;  
namespace ConsoleApplication1  
{  
class Program  
{  
    //Default DownloadPage from CSHTTP  
    static String DownloadPage(Uri url, string line)  
    {  
        WebProxy proxy = new WebProxy(line, true);  
        WebRequest http = HttpWebRequest.Create(url);  
        http.Timeout = 1000;  
        HttpWebResponse response = (HttpWebResponse)http.GetResponse();  
        StreamReader stream = new StreamReader(response.GetResponseStream(), System.Text.Encoding.ASCII);  
        String result = stream.ReadToEnd();  
        response.Close();  
        stream.Close();  
        return result;  
    }  
    static void Main(string[] args)  
    {  
        //Opening a text stream  
        StreamWriter sw = new StreamWriter("goodsites.txt", true);  
        StreamReader sr = new StreamReader("fullsites.txt");  
        string line = sr.ReadLine();  
        while (line != null)  
        {  
            //Building the URL  
            string u = (line);  
            Uri url = new Uri(u);  
            Console.WriteLine("Sites...");  
            Console.WriteLine(line);  
            Console.WriteLine("This is the response:");  
            try  
            {  
                string result = "";  
                result = DownloadPage(url, line);  
                Console.WriteLine(result);  
                if (result != null)  
                {  
                    sw.WriteLine(line);  
                }  
            }  
            catch (UriFormatException e)  
            {  
                Console.WriteLine("invalid URL");  
            }  
            catch (IOException e)  
            {  
                Console.WriteLine("invalid");  
            }  
            catch (WebException webExcp)  
            {  
                // To string  
                Console.WriteLine(webExcp.ToString());  
                // Get the WebException status code.  
                WebExceptionStatus status = webExcp.Status;  
                if (status == WebExceptionStatus.ProtocolError)  
                {  
                    Console.Write("The server returned protocol error ");  
                    // Get HttpWebResponse so that you can check the HTTP status code.  
                    HttpWebResponse httpResponse = (HttpWebResponse)webExcp.Response;  
                    Console.WriteLine((int)httpResponse.StatusCode + " - "  
                       + httpResponse.StatusCode);  
                }  
            }  
            Console.WriteLine("");  
            Console.WriteLine("");  
                line = sr.ReadLine();      
            }  
            sr.Close();  
            sw.Close();  
            Console.WriteLine("All done!");  
            Console.ReadKey();  
        }  
    }  
}