title: Top-level control cannot be added to a control
body: <p>How to Load other Form inside panel in a primary form.</p>
  
  <p>i was trying something like </p>
  
  <pre><code>private void frmInitialEntryBooks_Load(object sender, EventArgs e)
  {
      frmSujbect objForm = new frmSujbect();
      pnl.Controls.Add(objForm);
      objForm.FormBorderStyle = System.Windows.Forms.FormBorderStyle.None;
      objForm.Dock = DockStyle.Fill;
      objForm.Show();
  }
  </code></pre>
  
  <p>but it throw exception <code>Top-level control cannot be added to a control</code> at line <code>pnl.Controls.Add(objForm);</code></p>