Question

i am working on some code where a timer tick every seconds and and get data from Webservice and Shows in on WInform ,

What is the best approach to not run Multiple operations at same time ?

operation should run if previous operation completed and not running.

the code is

  public void loadbalance()
    {
       try { //Get Data from Internet }
       catch { }
    }

    delegate void loadbalancedelegate();

    public void loadBalanceAsync()
    {
        loadbalancedelegate worker = new loadbalancedelegate(loadbalance);
        AsyncCallback LoadbalnceCallBack = new AsyncCallback(loadbalanceCompleted);

        AsyncOperation async = AsyncOperationManager.CreateOperation(null);
        worker.BeginInvoke(LoadbalnceCallBack,async);
    }

    public void loadbalanceCompleted(IAsyncResult result)
    {
         loadbalancedelegate worker = (loadbalancedelegate)          ((AsyncResult)result).AsyncDelegate;
        AsyncOperation async = (AsyncOperation)result.AsyncState;

        worker.EndInvoke(result);
    }

    delegate void setControlsBalanceDelegate(BalanceOB ball);

    void setControlsBalance(BalanceOB ball)
    {
        if (this.InvokeRequired)
            this.Invoke(new setControlsBalanceDelegate(this.setControlsBalance), new
            object[] { ball });
        else
        {    //Update Data on Form (Windows App)

        }
    }

Answer 1

you can just disable the timer till one operation completes or set some field on completion (maybe better a ManualResetEventSlim because of multithreading).

Or have a look at the reactive extensions – there are a lot of good examples for such things.

You can find many samples here: 101 LINQ Samples, and very good intros here: Beginner’s Guide to the Reactive Extensions.
And finally Somasegar has one blog-post that is very similar to your problem with Rx: Reactive Extensions for .NET (webservice call of bingtranslate with all you ever need 😉 )