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copied!<p>All controls have a method called Invoke, which takes a delegate as the first argument and optional <em>params object[]</em>.<br> You can use this method easily:</p> <pre><code>richTextBox1.Invoke(new MethodInvoker(DoSomething)); </code></pre> <p>where </p> <pre><code>void DoSomething() { richTextBox1.BackColor = Color.Cyan; } </code></pre> <p>The delegate MethodInvoker is in the System.Windows.Forms namespace, which, I suppose, you are already using. </p> <p>You can even invoke from the same thread! </p> <p>You can also use parameters, like this: </p> <pre><code>richTextBox1.Invoke(new ColorChanger(DoSomething), Color.Cyan); </code></pre> <p>where </p> <pre><code>delegate void ColorChanger(Color c); void DoSomething(Color c) { richTextBox1.BackColor = c; } </code></pre> <p>I hope this helped! </p> <p>Edit:<br> <code>InvokeRequired</code> is required if you are using the same method from a... basically... unknown thread. So it would look like this: </p> <pre><code>void DoSomething() { if (richTextBox1.InvokeRequired) richTextBox1.Invoke(new MethodInvoker(DoSomething)); else { richTextBox1.BackColor = Color.Cyan; // Here should go everything the method will do. } } </code></pre> <p>You may call this method from ANY thread! </p> <p>And for parameters:</p> <pre><code>delegate void ColorChanger(Color c); void DoSomething(Color c) { if (richTextBox1.InvokeRequired) richTextBox1.Invoke(new ColorChanger(DoSomething), c); else { richTextBox1.BackColor = c; // Here should go everything the method will do. } } </code></pre> <p>Enjoy programming!</p>

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