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copied!<p>I believe you would need 3 classes:</p> <ol> <li>a <strong>login</strong> form, where the user will authenticate by inserting the credentials and clicking the <code>loginButton</code></li> <li>a <strong>main</strong> form, to hold the menu strip, where the other forms could be shown by pressing the menu buttons</li> <li>the <strong>child</strong> form, which will have a <code>logoutButton</code> and other custom controls (so basically you can derive other child forms from it)</li> </ol> <p>In the <strong>login</strong> form, handle the login button click like this:</p> <pre><code>private void loginButton_Click(object sender, EventArgs e) { if (Authenticated(username.Text, password.Text)) { var mainForm = new MainForm(); this.Visible = false; mainForm.Show(this); } } </code></pre> <p>The main form, add a handler for the form closing event and some handlers for showing the children:</p> <pre><code>public MainForm() { InitializeComponent(); FormClosing += MainForm_FormClosing; } void MainForm_FormClosing(object sender, FormClosingEventArgs e) { this.Owner.Visible = true; } private void form1ToolStripMenuItem_Click(object sender, EventArgs e) { var childForm = new ChildForm(); childForm.Show(this); } </code></pre> <p>In the child form, when clicking on the <code>logoutButton</code>, get a reference to the owner of the child form (which will be the <strong>main</strong> form), close it's owned forms (all it's children) and close the <strong>main</strong> form itself:</p> <pre><code>private void logoutButton_Click(object sender, EventArgs e) { var owner = ((MainForm)this.Owner); foreach (var childForm in owner.OwnedForms) { childForm.Close(); } owner.Close(); } </code></pre>

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