How to use the HttpWebRequest class and the HttpWebResponse class to search for items on a computer that is running Exchange 2000 Server in Visual C#

using System;
using System.Net;
using System.IO;      

namespace WebDavNET
{
  /// <summary>
  /// Summary description for Class1.
  /// </summary>
  class Class1
  {
    static void Main(string[] args)
    {
      try 
      {
        // TODO: Replace with the URL of an object on the computer that is running Exchange 2000.
        string sUri = "http://ExchServer/Exchange/UserAlias/Inbox/";

        System.Uri myUri = new System.Uri(sUri);
        HttpWebRequest HttpWRequest = (HttpWebRequest)WebRequest.Create(myUri);

        string sQuery;
        sQuery = "<?xml version='1.0'?>" + 
          "<g:searchrequest xmlns:g='DAV:'>" +
          "<g:sql>SELECT \"DAV:displayname\" " +
          "FROM SCOPE('SHALLOW TRAVERSAL OF \"" + sUri + "\"') " +
          "WHERE \"DAV:isfolder\" = false" + 
          "</g:sql>" +
          "</g:searchrequest>";

        // Set the credentials.
        // TODO: Replace with the appropriate user credentials.
        NetworkCredential myCred = new NetworkCredential(@"DomainName\UserName", "UserPassword");
        CredentialCache myCredentialCache = new CredentialCache();
        myCredentialCache.Add(myUri, "Basic", myCred);
        HttpWRequest.Credentials = myCredentialCache;

        // Set the headers.
        HttpWRequest.KeepAlive = false;
        HttpWRequest.Headers.Set("Pragma", "no-cache");

        HttpWRequest.Headers.Set("Translate", "f");
        HttpWRequest.Headers.Set("Depth", "0");
        HttpWRequest.ContentType =  "text/xml";
        HttpWRequest.ContentLength = sQuery.Length;

        //Set the request timeout to 5 minutes.
        HttpWRequest.Timeout = 300000;
        // Set the request method.
        HttpWRequest.Method = "SEARCH";


        //Store the data in a byte array.
        byte[] ByteQuery = System.Text.Encoding.ASCII.GetBytes(sQuery);
        HttpWRequest.ContentLength = ByteQuery.Length;
        Stream QueryStream = HttpWRequest.GetRequestStream();
        // Write the data to be posted to the Request Stream.
        QueryStream.Write(ByteQuery,0,ByteQuery.Length);
        QueryStream.Close();

        // Send the request and get the response.
        HttpWebResponse HttpWResponse = (HttpWebResponse)HttpWRequest.GetResponse();

        
        // Get the Status code.
        int iStatCode =  (int)HttpWResponse.StatusCode;
        string sStatus = iStatCode.ToString();
        Console.WriteLine("Status Code: {0}", sStatus);
        // Get the request headers
        string sReqHeaders = HttpWRequest.Headers.ToString();
        Console.WriteLine(sReqHeaders);

        // Read the Response Stream.
        Stream strm = HttpWResponse.GetResponseStream();
        StreamReader sr = new StreamReader(strm);
        string sText = sr.ReadToEnd();
        Console.WriteLine("Response: {0}", sText);

        // Close the stream.
        strm.Close();

        // Clean up
        myCred = null;
        myCredentialCache = null;
        HttpWRequest = null;
        HttpWResponse = null;
        QueryStream = null;
        strm = null;
        sr = null;
       
      }
      catch (Exception e)
      {
        Console.WriteLine("{0} Exception caught.", e);
      }
    }
  }
}