How to list folders and items in a mailbox on an Exchange 2000 Server computer by using WebDAV in Visual C#

using System;
using System.Reflection;

namespace WebDav
{
	class Class1
	{   
		public static void Main(String [] args)
		{
			try 
			{           
				MSXML2.XMLHTTP30 oXMLHttp = new MSXML2.XMLHTTP30();

				//TODO: To list items, uncomment "const bool bListItems = false;"
				const bool bListFolders = true;
				//const bool bListItems = false;
				String sUrl;
				
				//TODO: Replace ExchServer with your Exchange server and UserAlias with your user alias.
				sUrl= "http://ExchServer/Exchange/UserAlias/Inbox";
				

				oXMLHttp.open("SEARCH", sUrl, false, "UserDomain\UserAlias", "UserPassword");
                        
				//TODO: Use this query to list items.
				/*String sQuery;
				sQuery = "<?xml version='1.0'?>" + 
				    "<g:searchrequest xmlns:g='DAV:'>" +
				    "<g:sql>SELECT \"DAV:displayname\" " +
				    "FROM SCOPE('SHALLOW TRAVERSAL OF \"" + sUrl + "\"')" +
				    " WHERE \"DAV:isfolder\" = " + bListItems.ToString()+

				    "</g:sql>" +
				    "</g:searchrequest>";
				*/


				//TODO: Use this query to list folders.
				String sQuery;
				sQuery = "<?xml version='1.0'?>" + 
					"<g:searchrequest xmlns:g='DAV:'>" +
					"<g:sql>SELECT \"DAV:displayname\" " +
					"FROM SCOPE('SHALLOW TRAVERSAL OF \"" + sUrl + "\"')" +
					" WHERE \"DAV:isfolder\" = " + bListFolders.ToString() +
					"</g:sql>" +
					"</g:searchrequest>";


				oXMLHttp.setRequestHeader("Content-Type", "text/xml");
				oXMLHttp.setRequestHeader("Translate", "f");
				oXMLHttp.setRequestHeader("Content-Length", "" + sQuery.Length);
				Console.WriteLine(sQuery);
				oXMLHttp.send(sQuery);

				Console.WriteLine(oXMLHttp.status);
				Console.WriteLine(oXMLHttp.statusText);
				Console.WriteLine(oXMLHttp.responseText);
			}
			catch (Exception e)
			{
				Console.WriteLine("{0} Exception caught.", e);
			}

		}
	}
}