private void button7_Click(object sender, EventArgs e)
        {
            //this.Hide();
            //frm_select_exam_2 frm_select_exam_2 = new frm_select_exam_2();
            //frm_select_exam_2.StartPosition = FormStartPosition.CenterScreen;
            //frm_select_exam_2.Show();

             

            this.Hide();
            frm_select_exam frm_select_exam = new frm_select_exam();
            frm_select_exam.StartPosition = FormStartPosition.CenterScreen;
            frm_select_exam.Show();

        }
        private void rEVIEWEXAMToolStripMenuItem_Click(object sender, EventArgs e)
        {
            class_Application.review_flag = 0;
            frm_select_exam frm_select_exam = new frm_select_exam();
            frm_select_exam.StartPosition = FormStartPosition.CenterScreen;
            frm_select_exam.Show();
            

        }
 //--opening the exam selection combobox--->
 private void startExamToolStripMenuItem_Click(object sender, EventArgs e)
 {
     class_Application.REVIEW = 0;
     frm_select_exam frm_select_exam = new frm_select_exam();
     frm_select_exam.MdiParent = this;
     frm_select_exam.StartPosition = FormStartPosition.CenterScreen;
     frm_select_exam.Show();
 }