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BeginInvoke and Invoke Messages   Related Types This message was discovered on microsoft.public.dotnet.languages.csharp. Responses highlighted in red are from those people who are likely to be able to contribute good, authoratitive information to this discussion. They include Microsoft employees, MVP's and others who IMHO contribute well to these kinds of discussions. Post a new message to this list... Nick Hi all, Are the two snippets below equivelent, since they both only continue once the ShowForm method returns??? 1. delShowForm del = new delShowForm(ShowForm); //show form shows a form IAsyncResult asyncResult = this.BeginInvoke(del); asyncResult.AsyncWaitHandle.WaitOne(); this.EndInvoke(asyncResult); 2. delShowForm del = new delShowForm(ShowForm); //show form shows a form this.Invoke(del); Thanks for any explaination Nick Reply to this message...        Dmitriy Lapshin [C# / .NET MVP] (VIP) They seem to be equivalent. But, in general, using BeginInvoke in such a context ensures your worker thread wouldn't block if the main UI thread is showing a modal window or is busy and cannot retrieve and dispatch messages from the window message queue. Also note that in Snippet #1 you can do some useful work after you've called BeginInvoke and before you start waiting for the async call to complete. -- Dmitriy Lapshin [C# / .NET MVP] X-Unity Test Studio http://x-unity.miik.com.ua/teststudio.aspx Bring the power of unit testing to VS .NET IDE "Nick" <Click here to reveal e-mail address> wrote in message news:Click here to reveal e-mail address... [Original message clipped] Reply to this message...        100 Hi Nick, I assume we are talking about Control's BeginInvoke and Invoke methods. 1. If they are called form a thread different than the UI thread owning the underlaying windows control handler (for example they are called form a worker thread). The effect of both will be the same. I belive the form with Invoke as preferable because it is shorter and more readable. The form with BeginInvoke is useful when you want to do some work between the momends of calling the ShowForm method and polling the result. 2. When those two are called form the UI thread that owns the form they have different behaviour: - Using Invoke dosen't make sense. you can call the ShowForm method directly. - Using BeginInvoke in the same way like in your example will cause deadlock. Because of the WaitOne() call. Removing the line with WaitOne will bring us to the first case with invoke, which is senseless. BeginInvoke in the case of not polling the result could be verry useful if you want to have PostMessage-like behaviour. HTH B\rgds 100 "Nick" <Click here to reveal e-mail address> wrote in message news:Click here to reveal e-mail address... [Original message clipped] Reply to this message...     System.IAsyncResult Ad MBR BootFX Best-of-breed application framework for .NET projects, developed by Matthew Baxter-Reynolds and MBR IT

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