private void cmuAdd_Click(object sender, EventArgs e)
 {
     if (this.Tag.Equals("Class"))
     {
         FrmAddClass frmAddClass = new FrmAddClass(dgvDetails);
         frmAddClass.ShowDialog();
     }
     else if (this.Tag.Equals("Student"))
     {
         if (BusinessRuler.Classes.isInCapacity(_currentClassName))
         {
             FrmAddStudent frmAddStudent = new FrmAddStudent(dgvDetails, _currentClassName);
             frmAddStudent.ShowDialog();
         }
     }
     else if (this.Tag.Equals("Subject"))
     {
         FrmAddSubject frmAddSubject = new FrmAddSubject(this.dgvDetails);
         frmAddSubject.ShowDialog();
     }
     else if (this.Tag.Equals("Course"))
     {
         FrmAddCourse frmAddCourse = new FrmAddCourse(dgvDetails, _currentClassName);
         frmAddCourse.ShowDialog();
     }
     else if (this.Tag.Equals("Score"))
     {
         BusinessRuler.Classes objClass = new BusinessRuler.Classes();
         if (objClass.IsStudentExists(_currentClassName) && objClass.IsCourseExist(_currentClassName))
         {
             FrmAddScore frmAddScore = new FrmAddScore(dgvDetails, _currentClassName);
             frmAddScore.ShowDialog();
         }
     }
 }
        private void trbAdd_Click(object sender, EventArgs e)
        {
            FrmAddCourse frmAddCourse = new FrmAddCourse(this.dgvDetails, _className);

            frmAddCourse.ShowDialog();
        }