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    <p>There are a few things wrong with your <code>Invoke</code> calls. </p> <ul> <li>You don't need to create an object array to pass the parameters. </li> <li>Passing <code>DispatcherPriority.Normal</code> is redundant (<code>Normal</code> is default). </li> <li>You aren't passing any parameters to the second <code>Invoke</code> method (which is probably where your error is happening).</li> </ul> <p>It should look like this:</p> <pre><code>private void UpdateTextBox(object txt) { if (msg_log.Dispatcher.CheckAccess()) { Dispatcher.Invoke(new UpdateText(UpdateTextBox), txt); } else { msg_log.Dispatcher.Invoke(new UpdateText(UpdateTextBox), txt); } } </code></pre> <p><strong>EDIT For <code>StackOverflowException</code></strong></p> <p>This will cause a <code>StackOverflowException</code> because you are calling your method in an infinite loop. This is happening because your method is simply calling itself over and over again.</p> <p>What <code>Dispatcher.Invoke</code> does is invoke the passed delegate on the thread that owns the <code>Dispatcher</code>. Just because the <code>msg_log</code> may have a different dispatcher, when you were calling <code>UpdateTextBox</code>, you were passing a delegate to the current method, which causes the infinite loop.</p> <p>What you really need to do is call a method on the msg_log object, like so:</p> <pre><code>private void UpdateTextBox(object txt) { if (msg_log.Dispatcher.CheckAccess()) { if (txt != null) msg_log.Text = txt.ToString(); } else { msg_log.Dispatcher.Invoke(new UpdateText(UpdateTextBox), txt); } } </code></pre>
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    1. USAbe Heidebrecht
    1. USAbe Heidebrecht
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    1. COFirst thank you for your quick reply. Well, now that error seems to be solved but now another error message is coming up when I press the Connect Button. _An unhandled exception of type 'System.StackOverflowException' occurred in WindowsBase.dll_ Please note that the OnClient* events are like ` private void client_OnDataReceived(object Sender, ClientReceivedArguments R) { UpdateTextBox(R.ReceivedData); } ` So these events should write some text like "Connected" into the msg_log TextBox
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    2. CO@GeorgeChondrompilas A stack overflow suggests that you've got a recursive loop going on. I.e. whatever changes your invoked method is doing is causing `UpdateTextBox` to trigger again, causing more changes, causing more triggers, etc.
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    3. CO@GeorgeChondrompilas I have updated the answer to address this.
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