WorkflowApplication wfApp = new WorkflowApplication(new ApprovalWF());
            wfApp.InstanceStore = new SqlWorkflowInstanceStore(ConfigurationManager.ConnectionStrings["WorkflowStore"].ConnectionString);
            wfApp.Load(approval.WorkflowId);
            //wfApp.Run();
            var bookmarkName = approverId.ToString() + approval.ApprovalId.ToString();
            wfApp.ResumeBookmark(bookmarkName, result);

var inputs = new Dictionary<string, object>() { { "Approvers", approvers }, { "ApprovalId", approvalId }, { "RaiserId", raiserId }, { "ApprovalSwitch", switchValue } };
        try
        {
            SqlWorkflowInstanceStore store = new SqlWorkflowInstanceStore(ConfigurationManager.ConnectionStrings["WorkflowStore"].ConnectionString);
            AutoResetEvent waitHandler = new AutoResetEvent(false);
            WorkflowApplication approvalWf = new WorkflowApplication(new ApprovalWF(), inputs);

            approvalWf.InstanceStore = store;

            approvalWf.PersistableIdle = delegate(WorkflowApplicationIdleEventArgs e)
            {
                return PersistableIdleAction.Unload;
            };
            approvalWf.Unloaded = (e) =>
            {
                waitHandler.Set();
            };
            approvalWf.Completed = delegate(WorkflowApplicationCompletedEventArgs e)
            {
                LogEvents.Info("Workflow: " + approvalId + " has completed with arguments: " + e);
            };
            approvalWf.Aborted = delegate(WorkflowApplicationAbortedEventArgs e)
            {
                LogEvents.Error("Workflow for " + approvalId + " has been aborted: " + e);
            };
            approvalWf.OnUnhandledException = delegate(WorkflowApplicationUnhandledExceptionEventArgs e)
              {
                  LogEvents.Error("Workflow for " + approvalId + " has thrown an error: " + e);
                  return UnhandledExceptionAction.Terminate;
              };

            var id = approvalWf.Id;
            var approval =_approvalDac.SelectAwfApprovalByApprovalId(approvalId);
            var firstOrDefault = approval.FirstOrDefault();
            if (firstOrDefault != null) firstOrDefault.WorkflowId = id;
            _approvalDac.UpdateApproval(approval.FirstOrDefault());

            approvalWf.Run();
            waitHandler.WaitOne();
        }