public int Add(Teacher teacher)
        {
            string sql    = $"Insert into Teacher(Name, Skills, TotalStudents, Salary, AddedOn) values('{teacher.Name}','{teacher.Skills}','{teacher.TotalStudents}','{teacher.Salary}','{teacher.AddedOn}')";
            int    retVal = _sqlHelper.ExecuteCurdQuery(sql);

            return(retVal);
        }