protected void RBSubmit_Click(object sender, EventArgs e)
    {
        int       count              = 0;
        int       countStopper       = 0;
        string    StudentID          = "";
        string    SubjectID          = "";
        string    SubjectName        = "";
        AbcDAL    MyDAL              = new AbcDAL("");
        DataTable ResultTable        = MyDAL.PopulateClass();
        DataTable ResultTableSubject = MyDAL.SelectSubjectMasterByID(RCBSubject.SelectedValue.ToString().Trim());

        foreach (DataRow row in ResultTable.Rows)
        {
            SubjectName = ResultTableSubject.Rows[0]["SubjectName"].ToString().Trim();
            SubjectID   = ResultTable.Rows[count]["SubjectID"].ToString().Trim();
            StudentID   = ResultTable.Rows[count]["StudentID"].ToString().Trim();
            if (StudentID == RCBStudent.SelectedValue.ToString().Trim() && SubjectID == RCBSubject.SelectedValue.ToString().Trim())
            {
                countStopper++;
            }
            count++;
        }
        if (countStopper >= 1)
        {
            Response.Redirect("EnrollSubject.aspx?MsgPos=5&MsgType=warning&MsgContent=Student already exists in " + SubjectName.Trim());
        }
        else
        {
            MyDAL.AddClassMaster("Classs A", RCBSubject.SelectedValue, RCBStudent.SelectedValue);
            Response.Redirect("EnrollSubject.aspx?MsgPos=5&MsgType=warning&MsgContent=Success in Enrollment");
        }
    }