When you place a TabControl control on your form, it contains two tabs by default. You can add or remove tabs using the designer.
The following procedure requires a Windows Application project with a form containing a TabControl control. For information about setting up such a project, see How to: Create a Windows Application Project and How to: Add Controls to Windows Forms.
The dialog boxes and menu commands you see might differ from those described in Help depending on your active settings or edition. To change your settings, choose Import and Export Settings on the Tools menu. For more information, see Customizing Development Settings in Visual Studio.
To add or remove a tab using the designer
On the control's smart tag, click Add Tab or Remove Tab
In the Properties window, click the Ellipsis button () next to the TabPages property to open the TabPage Collection Editor. Click the Add or Remove button.