How to use the HttpWebRequest object and the HttpWebResponse object to modify the urn:schemas:mailheader:subject property in Visual C# (313126)

MORE INFORMATION

1. Start Microsoft Visual Studio .NET or Microsoft Visual Studio 2005.
2. On the File menu, point to New, and then click Project.
3. In the Visual C# Projects typeslist, click Console Application.
   
   Note In Visual Studio 2005, click Console Application in the Visual C# list.
   
   n Visual Studio .NET, Class1.cs is created by default. In Visual Studio 2005, Program.cs is created by default.
4. In the code window, replace the code with the following:

   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 in Exchange Server
               string sUri = "http://ExchServer/Public/MyFolder/Test.EML";
   
               System.Uri myUri = new System.Uri(sUri);
               HttpWebRequest HttpWRequest = (HttpWebRequest)WebRequest.Create(myUri);
   
               string sQuery;
               sQuery = "<?xml version='1.0'?>" + 
                  "<a:propertyupdate xmlns:a='DAV:' " + 
                  "xmlns:m='urn:schemas:mailheader:'>" + 
                  "<a:set><a:prop>" + 
                  "<m:subject>" + "ModifiedSubject" + "</m:subject>" +
                  "</a:prop></a:set>" + 
                  "</a:propertyupdate>";
   
               // Set Credentials
               // TODO: Replace with appropriate user credential
               NetworkCredential myCred = new NetworkCredential(@"DomainName\UserName", "Password");
               CredentialCache myCredentialCache = new CredentialCache();
               myCredentialCache.Add(myUri, "Basic", myCred);
               HttpWRequest.Credentials = myCredentialCache;
           
               //Uncomment the following statement and comment the previous 4 statements if you 
               //use Integrated Windows authentication
               //httpWRequest.Credentials = CredentialCache.DefaultCredentials
   
               //Note In Basic type authentication, the username and the password are sent as base64-encoded text, which is 
               //easily decoded. Microsoft recommends that you use Basic over SSL to help protect the username and the password.
   
               // Set Headers
               HttpWRequest.KeepAlive = false;
               HttpWRequest.Headers.Set("Pragma", "no-cache");
               HttpWRequest.Headers.Set("Translate", "f");
               HttpWRequest.ContentType =  "text/xml";
               HttpWRequest.ContentLength = sQuery.Length;
   
               //set the request timeout to 5 min.
               HttpWRequest.Timeout = 300000;
               // set the request method
               HttpWRequest.Method = "PROPPATCH";
   
               // You must 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 Request and Get 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 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);
            }
         }
      }
   
   }

5. Search for TODO in the code, and then modify the code for your environment.
6. Build and then run the program.
7. Make sure that the subject of the specified item has been modified.