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copied!<pre><code>// Declaring a delegate function kind of lifts the function away from the // current object and the current thread, making it 'thread-safe' to call // (although it may still not be thread-safe to execute). delegate void updateTextField(string Text); private void updateText(string Text) { // This asks the control if it's running on the same thread as this method is // currently executing, i.e. can I update you directly or do I need to use // the cross thread calling method "Invoke". if (txtDelegate.InvokeRequired) { // Here we define the delegate function that's going to be Invoked. // Here it's the same function were currently within but when it's invoked // by the following line, it'll be done on the same thread as the control. // At that point, InvokeRequired will return false and the other branch // will be followed to update the actual text on the control. updateTextField del = new updateTextField(updateText); // Here we invoke the function passing in the Text we want to update the // control with as a parameter. txtDelegate.Invoke(del, new object[] { Text }); } else { // When this function is Invoked, this is the branch that will be followed // (as we're on the same thread as the control) and the text on the control // will be replaced with the text passed in from the Invoke. txtDelegate.Text = Text; } } </code></pre> <p>I hope that covers it in a bit more detail, the actual mechanics of the delegate being 'thread-safe' is beyond the scope of this answer.</p>

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