Show start and end time for each User ID respectively

I am ruing a foreach loop on each UserId but for some reason... In my xml, only one userId is being displayed along with all the start time and end time for all userIds. I need it to show start and end time for each userId respectively.

So it looks like this:

User2
Start
End
Start
End
Start
End

It needs to looks like this:

User1
Start
End
Start
End

User2
Start
End

My code:

foreach (String userId in request.Users) // request.Users is a Array of UserId's 
{
    List<UserModel> result = // I am making my DataAccess Layer call here.
    UserRecord record = new UserRecord();
    record.UserId = userId;
    record.TimePeriodList = new List<TimePeriod>();
    for (int i = 0; i < result.Count; i += 2)
    {
        TimePeriod timeData = new TimePeriod();
        timeData.StartTime = result[i].TimeDate;
        // if result count is an odd number and this is the last iteration for the UserId
        if (((result.Count & 1) == 1) && (i == result.Count))
            {
                timeData.EndTime = result[i + 1].TimeDate;
            }
            record.TimePeriodList.Add(timeData);
        }
        response.UserRecordList = new List<UserRecord>();
        response.UserRecordList.Add(record);
}

public class GetUserResponse
{
    private List<UserRecord> userRecordList;

    public List<UserRecord> UserRecordList
    {
        get { retu userRecordList; }
        set { userRecordList = value; }
    }
}

public class UserRecord
{
    private string userId;
    private List<TimePeriod> timePeriodList;

    public string UserId
    {
        get { retu userId; }
        set { userId = value; }
    }

    public List<TimePeriod> TimePeriodList
    {
        get { retu timePeriodList; }
        set { timePeriodList = value; }
    }
}

public class TimePeriod
{
    private DateTime startTime;
    private DateTime endTime;

    public DateTime StartTime
    {
        get { retu startTime; }
        set { startTime = value; }
    }

    public DateTime EndTime
    {
        get { retu endTime; }
        set { endTime = value; }
    }
}

My data retued from DataAccess layer looks like this:

UserId    Time        EventType
Test1   xx-xx-xxxx   Start
Test1   xx-xx-xxxx   End
Test2   xx-xx-xxxx   Start

So if there is an odd number then the End time for that User is DateTime.MinValue by default.