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copied!<p>You are referencing <code>testButton1</code> like it was a static field instead of an instance field. You need to be able to access the instance of the form. You can do this like this:</p> <pre><code>public partial class Form1 : Form { public static Form1 Instance { get; private set; } public Form1() { InitializeComponent(); if (Instance != null) throw new Exception("Only one instance of Form1 is allowed"); Instance = this; FormClosed += new FormClosedEventHandler(Form1_FormClosed); } void Form1_FormClosed(object sender, FormClosedEventArgs e) { Instance = null; } public Button TestButton1 { get { return testButton1; } } } </code></pre> <p>Because controls on the form are protected by default, you have to make the button accessible. You do this using the <code>TestButton1</code> property.</p> <p>Now you can access the textbox using <code>BElite.Form1.Instance.TestButton1</code>.</p> <p>Two notes:</p> <ol> <li><p>This only works if you always have a single <code>Form1</code>, for example when <code>Form1</code> is the main form of your application;</p></li> <li><p>Please note that accessing these controls from a different thread must be done using <code>Control.Invoke()</code> or <code>Control.BeginInvoke()</code>. See the documentation on these methods on why and how.</p></li> </ol> <p>You can access the button using <code>BeginInvoke()</code> with the following sample:</p> <pre><code>Form1.Instance.BeginInvoke(new Action(() => { Form1.Instance.TestButton1.Text = "My new text"; })); </code></pre> <p>Everything in the block (<code>{ ... }</code>) is safe.</p>

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