private void viewStudentInformationToolStripMenuItem_Click(object sender, EventArgs e)
 {
     if (frmViewStudent1 == null)
     {
         frmViewStudent1 = new frmViewStudent();
         frmViewStudent1.FormBorderStyle = FormBorderStyle.None;
         frmViewStudent1.FormClosed     += frmViewStudent1_FormClosed;
         this.DisplayButtons(false);
         frmViewStudent1.ShowDialog();
     }
     else
     {
         frmViewStudent1.Activate();
     }
 }
 void frmViewStudent1_FormClosed(object sender, FormClosedEventArgs e)
 {
     frmViewStudent1 = null;
     this.DisplayButtons(true);
 }