Appending To TextBox From Another Class and Thread C#
<p>I have a form that sets up and displays the text box.  In the form load method, I am starting a new thread from a completely separate class name <code>Processing</code>:</p>

<pre><code>    private void Form1_Load(object sender, EventArgs e)
    {
        Processing p = new Processing();
        Thread processingThread = new Thread(p.run);
        processingThread.Start();
    }
</code></pre>

<p>Here is the processing class.  What I would like to do is create a method in <code>Utilities</code> class that will allow me to update the text box from whatever class I would need to:</p>

<pre><code>public class Processing
{        
    public void run()
    {               
        Utilities u = new Utilities();

        for (int i = 0; i &lt; 10; i++)
        {
            u.updateTextBox("i");
        }                    
    }

 }
</code></pre>

<p>Then finally the <code>Utilites</code> class:</p>

<pre><code>class Utilities
{
    public void updateTextBox(String text) 
    {
        //Load up the form that is running to update the text box
        //Example:  
        //Form1.textbox.appendTo("text"):
    }
}
</code></pre>

<p>I have read about the <code>Invoke</code> methods, <code>SynchronizationContext</code>, Background threads and everything else, but almost all examples are using methods in the same class as the <code>Form</code> thread, and not from separate classes.</p>
