Menustrip item disabling

Extend you MainForm with a Property "IsAdmin" like this:

private bool isAdmin = true;
public bool IsAdmin{
        set{
                isAdmin = value;
                editToolStripMenuItem.Enabled = value;
        };
        get{
                return isAdmin;
        }
};

The code to open is:

// employee
MainForm mainForm = new MainForm();
mainForm.IsAdmin = false;
mainForm.ShowDialog();

// admin
MainForm mainForm = new MainForm();
mainForm.IsAdmin = true;
mainFrom.ShowDialog();