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

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This article describes how to use the HttpWebRequestobject and the HttpWebResponseobject from the "System.Net" namespace to modify the urn:schemas:mailheader:subject property for an item in Microsoft Exchange 2000 Server in Microsoft Visual C#.

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To modify the urn:schemas:mailheader:subject property for an item in Visual C#, follow these steps:
  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)
                // 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>" + 
                // 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
                // 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();
                // Read the Response Stream
                Stream strm = HttpWResponse.GetResponseStream();
                StreamReader sr = new StreamReader(strm);
                string sText = sr.ReadToEnd();
                Console.WriteLine("Response: {0}", sText);
                // Close Stream
                // 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.

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Keywords: KB313126, kbhowto, kbcode, kbxml, kbmsg

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Article Info
Article ID : 313126
Revision : 7
Created on : 12/11/2006
Published on : 12/11/2006
Exists online : False
Views : 346