public StudentModel GetDetails(int studentEnrollmentNumber)
        {
            SqlConnection studentRecord = new SqlConnection(_connectionString);

            string cmd = string.Format("SELECT * FROM state join StudentDetails on ( state.StateId = StudentDetails.StateId) join Streams on (StudentDetails.StreamId = Streams.StreamId) WHERE EnrollmentNumber  = {0} ", studentEnrollmentNumber);

            SqlCommand command = new SqlCommand(cmd, studentRecord);
            studentRecord.Open();

            SqlDataReader readerObject = command.ExecuteReader();
            if (readerObject.Read())
            {
                _studentModel = new StudentModel();

                _studentModel.EnrollmentNumber = Convert.ToInt32(readerObject["EnrollmentNumber"]);
                _studentModel.Name = (string)readerObject["Name"];
                _studentModel.State = (string)readerObject["StateName"];
                _studentModel.Stream = (string)readerObject["Stream"];
                _studentModel.StateId = Convert.ToInt32(readerObject["StateId"]);
                _studentModel.StreamId = Convert.ToInt32(readerObject["StreamId"]);
                return _studentModel;
            }

            return null;
        }
        public void GetDetails(int studentEnrollmentNumber)
        {
            _studentModel = _studentDBService.GetDetails(studentEnrollmentNumber);

            if (_studentModel != null)
            {
                //Student storeValue = new Student();
                this._enrollmentNumber = _studentModel.EnrollmentNumber;
                this._name = _studentModel.Name;
                this._marks = _studentModel.Marks;
                this._streamId = _studentModel.StreamId;
                this._stateId = _studentModel.StateId;
                this._state = _studentModel.State;
                this._stream = _studentModel.Stream;
            }
        }