WebDAV : How to retrieve list of folders from Exchange Server using Search method (WebDAV) programmatically ?

 using System;

 using System.Net;

 using System.IO;

 using System.Text;

 using System.Xml;

 namespace SampleCode

 {

    class GetFolders

    {

      static void Main(string[] args)

       {

          // Variables.

          System.Net.HttpWebRequest Request;

          System.Net.WebResponse Response;

          System.Net.CredentialCache MyCredentialCache;

          string strRootURI = "https://server/exchange/username/Inbox/"; // Provide the valid URI

          string strUserName = "UserName";

          string strPassword = "Password";

          string strDomain = "Domain";

          string strQuery ="";

          byte[] bytes = null;

          System.IO.Stream RequestStream = null;

          System.IO.Stream ResponseStream = null;

          System.Xml.XmlTextReader XmlReader = null;

          try

          {

             // Build the SQL query.

             strQuery = "<?xml version=\"1.0\"?><D:searchrequest xmlns:D = \"DAV:\" >";

             strQuery += "<D:sql>SELECT \"DAV:href\" FROM scope('hierarchical traversal of \"";

             strQuery += strRootURI + "\"')</D:sql></D:searchrequest>";

             // Create a new CredentialCache object and fill it with the network credentials required to access the server.

             MyCredentialCache = new System.Net.CredentialCache();

             MyCredentialCache.Add( new System.Uri(strRootURI),

                "NTLM",

                new System.Net.NetworkCredential(strUserName, strPassword, strDomain)

                );

             // Create the HttpWebRequest object.

             Request = (System.Net.HttpWebRequest)HttpWebRequest.Create(strRootURI);

             // Add the network credentials to the request.

             Request.Credentials = MyCredentialCache;

             // Specify the method.

             Request.Method = "SEARCH";

             // Encode the body using UTF-8.

             bytes = Encoding.UTF8.GetBytes((string)strQuery);

             // Set the content header length.  This must be

             // done before writing data to the request stream.

             Request.ContentLength = bytes.Length;

             // Get a reference to the request stream.

             RequestStream = Request.GetRequestStream();

             // Write the SQL query to the request stream.

             RequestStream.Write(bytes, 0, bytes.Length);

             // Close the Stream object to release the connection

             // for further use.

             RequestStream.Close();

             // Set the content type header.

             Request.ContentType = "text/xml";

             // Send the SEARCH method request and get the

             // response from the server.

             Response = (HttpWebResponse)Request.GetResponse();

             // Get the XML response stream.

             ResponseStream = Response.GetResponseStream();

             // Create the XmlTextReader object from the XML

             // response stream.

             XmlReader = new XmlTextReader(ResponseStream);

             // Read through the XML response, node by node.

             while(XmlReader.Read())

             {

                // Look for the opening DAV:href node.  The DAV: namespace is

                //typically assigned the a: prefix in the XML response body.

                if(XmlReader.Name == "a:href")

                {

                   // Advance the reader to the text node.

                   XmlReader.Read();

                   // Display the value of the DAV:href text node.

                   Console.WriteLine("Value: " + XmlReader.Value);

                   Console.WriteLine("");

                   //Advance the reader to the closing DAV:href node.

                   XmlReader.Read();

                }

             }

             // Clean up.

             XmlReader.Close();

             ResponseStream.Close();

             Response.Close();

          }

          catch(Exception ex)

          {

             // Catch any exceptions. Any error codes from the SEARCH method request

             Console.WriteLine(ex.Message);

          }

       }

    }

 }

Hope this helps.