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copied!<p>Well, there are two separate issues here:</p> <ul> <li>Updating the UI from a different class</li> <li>Updating the UI from a different thread</li> </ul> <p>The two are almost completely orthogonal. Once you've solved each of them in isolation, you can put the two together.</p> <p>If there are well-understood ways in which the UI needs to be changed (e.g. updating the text in a status bar or something like that) I would write methods in the UI class itself to do that, and just call those methods from the other class. Alternatively, you <em>can</em> expose the individual control of the UI - preferably through properties - and then use <code>Control.Invoke</code> in the normal way from the other class, e.g.</p> <pre><code>MethodInvoker action = () => form.StatusLabel.Text = "Finished"; form.BeginInvoke(action); </code></pre> <p>So long as you call <code>Invoke</code> on a control which "lives" on the same thread as all the controls you touch, it doesn't matter which one you use... so an alternative could be:</p> <pre><code>Label label = form.StatusLabel; MethodInvoker action = () => label.Text = "Finished"; label.BeginInvoke(action); </code></pre> <p>One difference here is that in this latter code, the <code>StatusLabel</code> property is being evaluated in the worker thread - which <em>could</em> lead to race conditions if your UI is changing it to refer to different labels at different times. I would generally prefer the first approach.</p> <p>(I agree with icktoofay's comment about <code>BeginInvoke</code> being preferable unless you really need to wait, by the way... although you do then need to be careful about changes to any variables captured by anonymous functions.)</p>

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