Question

I have a tab control on a blank form, although when I change tabs is there a way of changing the form when clicking on a different tab. See below for clarification:

E.g. If I clicked “tabPage2” I would be presented with Form2.cs

Answer 1

Yes. Just make Form2 borderless and change TopLevel to False, and then you can add it to the tabPage2.Controls collection like a normal form. Probably add DockStyle to Fill for that form, too.

Simple demo:

private void tabControl1_Selecting(object sender, TabControlCancelEventArgs e) {
  if (e.TabPage.Name == tabPage2.Name) {
    if (tabPage2.Controls.Count == 0) {
      Form f = new Form();
      f.TopLevel = false;
      f.FormBorderStyle = FormBorderStyle.None;
      f.BackColor = Color.Red;
      f.Dock = DockStyle.Fill;
      tabPage2.Controls.Add(f);
      f.Show();
    }
  }
}