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18464731
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2013-08-27T11:57:50.977
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2013-08-27T11:57:50.977
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2017-05-23T12:29:23.397
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I guess that the code in <code>MyQuickFixApp</code> class access to the default instance of your <code>ClientGUI</code>, not the instance which is actually running, each time you write <code>ClientGUI.(...)</code>. See this thread <a href="https://stackoverflow.com/q/4698538/2387010">Why is there a default instance of every form in VB.Net but not in C#?</a> for more information about default instance, which is something you should avoid to use. So you could add a parameter in the <code>MyQuickFixApp</code> class constructor : <pre><code> Public Class MyQuickFixApp Inherits MessageCracker : Implements IApplication Dim _clientGUI As ClientGUI = Nothing Public Sub New(cltGui As ClientGUI) _clientGUI = cltGui End sub (...) End class </code></pre> Then, replace in the <code>MyQuickFixApp</code> class all the <code>ClientGUI.(...)</code>, with <code>_clientGUI.(...)</code> to be sure to access to the correct instance. And finally, initialize your <code>MyQuickFixApp</code> class in <code>ClientGUI</code> like this: <pre><code>Dim myApp As New MyQuickFixApp(me) </code></pre> Note that this code, you can only access to the method of the class in the <code>Form_Load</code> event. This variable should be declared in the class and initialized in the form_load if you want to access it later from the <code>ClientGUI</code> form. <pre><code>Public Class ClientGUI Dim initiator As SocketInitiator Dim myApp As MyQuickFixApp() Public Sub ClientGUI_Load(sender As Object, e As EventArgs) Handles MyBase.Load (...) myApp =New MyQuickFixApp(Me) (...) End Sub (...) End Class </code></pre>
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1. POAppend text to a RichTextBox from another class in VB.NET
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1. POAppend text to a RichTextBox from another class in VB.NET
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1. COThank you so much ! I understood how it works, and now everything is perfect. Thank you for your help. However, I had to set the parameter Control.CheckForIllegalCrossThreadCalls to False.
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 USWilliam Gérald Blondel

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