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copied!<p>Well, I still don't know much about your use case, but I'll take a stab anyway, and provide a simple example.</p> <p>I assume that you want to control something on the main form from your floating form. To do this, you need a reference to your main form from your floating form. You do this by creating a constructor overload in your floating form that accepts an instance of your main form, like this:</p> <pre><code> public FloatingForm(MainForm mainForm) { InitializeComponent(); _mainForm = mainForm; } </code></pre> <p>The floating form contains a textbox named floatingFormTextBox, and a button named Button1. The partial class for the floating form looks like this:</p> <pre><code>public partial class FloatingForm : Form { MainForm _mainForm; public FloatingForm() { InitializeComponent(); } public FloatingForm(MainForm mainForm) { InitializeComponent(); _mainForm = mainForm; } private void button1_Click(object sender, EventArgs e) { _mainForm.DoSomething(floatingFormTextBox.Text); } } </code></pre> <p>The main form just contains a textbox named mainFormTextBox. When the main form loads, it creates an instance of the floating form, passing a reference to itself to the floating form's new constructor overload. The partial class for the main form looks like this:</p> <pre><code>public partial class MainForm : Form { FloatingForm _floatingForm; public MainForm() { InitializeComponent(); } public void DoSomething(string text) { mainFormTextBox.Text = text; this.Refresh(); } private void MainForm_Load(object sender, EventArgs e) { _floatingForm = new FloatingForm(this); _floatingForm.Show(); } } </code></pre> <p>Now, when I put some text into the textbox of the floating form and click the button, the text shows up in the textbox of the main form.</p>

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