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copied!<p>I think you may be confused in how you reference <code>Form1</code> and <code>Form2</code> from each other. </p> <p>Calling <code>new Form()</code> and <code>new Form2()</code> create references to <em>new</em> instances of <code>Form1</code> and <code>Form2</code>, they don't reference the forms that are already open. You need to get the references for the <em>existing</em> instances.</p> <p>Assuming that <code>Form1</code> is the main form for your application and it creates and shows <code>Form2</code>, you can either add a property to <code>Form2</code> that represents the instance of <code>Form1</code> that created it, or you can appropriate the <code>Owner</code> property for this purpose (I'd recommend that).</p> <p>In your code on <code>Form1</code> that shows <code>Form2</code> initially (not in the code you have above), call <code>frm2.Show(this)</code> instead of just <code>frm2.Show()</code>. This will set the <code>Owner</code> property of your <code>Form2</code> instance equal to thinstance of <code>Form1</code> that opened it.</p> <p>Then change your button code for <code>Form2</code> to this:</p> <pre><code>private void button1_Click(object sender, EventArgs e) { Form1 frm1 = (Form1)Owner; frm1.FindNext(); } </code></pre> <p>This will make you reference the existing form rather than a new one, which is what you want.</p> <p>As far as the <code>FindNext</code> function goes, you have two choices: either you can hold on to the reference of <code>Form2</code> (though you probably want to do this anyway) and access the text directly, or you can change <code>FindNext</code> to take a string (this is what I'd recommend).</p> <pre><code>public void FindNext(string searchText) { try { this.Focus(); richTextBox1.Focus(); findPos = richTextBox1.Find(searchText, findPos, RichTextBoxFinds.None); richTextBox1.Select(findPos + 1, searchText.Length); findPos += searchText.Length; } catch { MessageBox.Show("No Occurences Found"); findPos = 0; } } </code></pre> <p>Then change the call to <code>frm1.FindNext()</code> on <code>Form2</code> to <code>frm1.FindNext(textBox1.Text)</code>:</p> <pre><code>private void button1_Click(object sender, EventArgs e) { Form1 frm1 = (Form1)Owner; frm1.FindNext(textBox1.Text); } </code></pre>

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