private void button4_Click(object sender, EventArgs e)
 {
     try
     {
         Globle_data.student_selected_option   = "test";
         Globle_data.student_selected_language = "number";
         //typing_project.Numarical.frm_numarical lo = new typing_project.Numarical.frm_numarical();
         //lo.Show();
         frm_new_session_from nsf = new frm_new_session_from();
         nsf.Show();
         this.Hide();
     }
     catch (Exception ex)
     {
         MessageBox.Show(ex.ToString());
     }
 }
        private void select_language(object sender, EventArgs e)
        {
            try
            {
                PictureBox pb = (PictureBox)sender;
                Globle_data.student_selected_option   = "practice";
                Globle_data.student_selected_language = pb.Tag.ToString();

                //typing_project.Numarical.frm_numarical lo = new typing_project.Numarical.frm_numarical();
                //lo.Show();

                //Globle_data.student_selected_language = "number";

                frm_new_session_from nsf = new frm_new_session_from();
                nsf.Show();
                this.Hide();
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.ToString());
            }
        }