C:/Data/Projects/MCS EPM Global Practice/Frameworks/Public/mpfX/1.0/Libraries/Mcs.Epm.MicrosoftProject.mpFx/Proxies/CodePlex.MicrosoftProject.mpFx.Proxy.Timesheet.cs

/*  ----------------------------------------------------------------------------
 *  Microsoft Corporation
 *  ----------------------------------------------------------------------------
 *  Microsoft Project Server mpFx (mpFx)
 *  ----------------------------------------------------------------------------
 *  Author: Colby Africa
 *  ----------------------------------------------------------------------------
 *  License: http://code.msdn.microsoft.com/mpFx/Project/License.aspx
 *  ----------------------------------------------------------------------------
 */

using System;
using System.Net;
using Mcs.Epm.MicrosoftProject.mpFx.StatusingWebService;
using Microsoft.Office.Project.Server.Library;

namespace Mcs.Epm.MicrosoftProject.mpFx.Proxies
{
    public class StatusingProxy : Statusing
    {
        public StatusingProxy()
        {
            ContextString = string.Empty;
        }

        public string ContextString { get; set; }

        protected override WebRequest GetWebRequest(Uri uri)
        {
            //here we are overriding the GetWebRequest method and adding the 2 web request headers
            WebRequest webRequest = base.GetWebRequest(uri);

            if (ContextString != String.Empty)
            {
                webRequest.UseDefaultCredentials = true;
                webRequest.Credentials = CredentialCache.DefaultNetworkCredentials;
                webRequest.Headers.Add("PjAuth", ContextString);                
                webRequest.PreAuthenticate = true;

            }
            return webRequest;
        }

        public void SetImpersonationContext(bool isWindowsUser, String userNTAccount, Guid userGuid, Guid trackingGuid, Guid siteId, String lcid)
        {
            ContextString = GetImpersonationContext(isWindowsUser, userNTAccount, userGuid, trackingGuid, siteId, lcid);
        }

        private static String GetImpersonationContext(bool isWindowsUser, String userNTAccount, Guid userGuid, Guid trackingGuid, Guid siteId, String lcid)
        {
            PSContextInfo contextInfo = new PSContextInfo(isWindowsUser, userNTAccount, userGuid, trackingGuid, siteId, lcid);
            String contextString = PSContextInfo.SerializeToString(contextInfo);
            return contextString;
        }
    }
}

---