/// <summary>
        /// Send an authentication request to the IDP.
        /// </summary>
        private void SendRequest(HttpContext context)
        {
            Trace.TraceMethodCalled(GetType(), "SendRequest()");

            // See if the "ReturnUrl" - parameter is set.
            string returnUrl = context.Request.QueryString["ReturnUrl"];
            if (!string.IsNullOrEmpty(returnUrl))            
                context.Session["RedirectUrl"] = returnUrl;            

            IDPEndPoint idpEndpoint = RetrieveIDP(context);

            if (idpEndpoint == null)
            {
                //Display a page to the user where she can pick the IDP
                SelectSaml20IDP page = new SelectSaml20IDP();
                page.ProcessRequest(context);
                return;
            }

            Saml20AuthnRequest authnRequest = Saml20AuthnRequest.GetDefault();
            TransferClient(idpEndpoint, authnRequest, context);            
        }
        /// <summary>
        /// Send an authentication request to the IDP.
        /// </summary>
        private void SendRequest(HttpContext context)
        {
            Trace.TraceMethodCalled(GetType(), "SendRequest()");

            // See if the "ReturnUrl" - parameter is set.
            string returnUrl = context.Request.QueryString["ReturnUrl"];
            if (!string.IsNullOrEmpty(returnUrl))            
                context.Session["RedirectUrl"] = returnUrl;            

            IDPEndPoint idpEndpoint = RetrieveIDP(context);

            if (idpEndpoint == null)
            {
                //Display a page to the user where she can pick the IDP
                SelectSaml20IDP page = new SelectSaml20IDP();
                page.ProcessRequest(context);
                return;
            }

            Saml20AuthnRequest authnRequest = Saml20AuthnRequest.GetDefault();
            // VALTECH: Publish AssertionConsumerServiceURL which is missing in DK framework. Reguired by Logica idp.
            authnRequest.Request.AssertionConsumerServiceURL = 
                SAML20FederationConfig.GetConfig().ServiceProvider.AssertionConsumerServiceURL ?? context.Request.Url.ToString();

            TransferClient(idpEndpoint, authnRequest, context);            
        }