private void VentanaPrincipal_Load(object sender, EventArgs e)
        {
            ConexionBaseDeDatos.Logear(empleado, usuario, "Inicio sesion");
            cargo = ConexionBaseDeDatos.ObtenerCargo(empleado);
            switch (cargo)
            {
            case 1:
                inventarioToolStripMenuItem.Enabled = true;
                productosToolStripMenuItem.Enabled  = true;
                usuariosToolStripMenuItem.Enabled   = true;
                historialToolStripMenuItem.Enabled  = true;
                break;

            case 2:
                inventarioToolStripMenuItem.Enabled = true;
                productosToolStripMenuItem.Enabled  = true;
                usuariosToolStripMenuItem.Enabled   = false;
                historialToolStripMenuItem.Enabled  = false;
                break;

            case 3:
                inventarioToolStripMenuItem.Enabled = true;
                productosToolStripMenuItem.Enabled  = false;
                usuariosToolStripMenuItem.Enabled   = false;
                historialToolStripMenuItem.Enabled  = false;
                break;

            case 4:
                inventarioToolStripMenuItem.Enabled = false;
                productosToolStripMenuItem.Enabled  = false;
                usuariosToolStripMenuItem.Enabled   = false;
                historialToolStripMenuItem.Enabled  = false;
                break;
            }
        }