WPF Dispatcher.BeginInvoke() method update too late UI

Question

hi All,
          

          i am using multiple thred in Wpf application. i am updating UI  from another thred to display log of process

         using this line 

         " System.Windows.Application.Current.Dispatcher.BeginInvoke(DispatcherPriority.Background, new Action(() => updateText(message)));"

          but log updating remain behind from the actual current process
       

i am getting bored for this process  so please help