private void button4_Click(object sender, EventArgs e)
        {
            this.Hide();
            View_Tablets vt = new View_Tablets();

            vt.ShowDialog();
            this.Close();
        }
        // view tablet list
        private void button1_Click(object sender, EventArgs e)
        {
            View_Tablets view = new View_Tablets(false);

            view.ShowDialog();
        }
        private void vIEWTABLETSToolStripMenuItem_Click(object sender, EventArgs e) //opening view tablets page in Doctor view mode
        {
            View_Tablets view = new View_Tablets(false);                            //true-> admin view

            view.ShowDialog();                                                      //false-> doctor view
        }