ArgumentOutOfRangeException (Null Exception)

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ASP.NET

C#5.0

I have surveys categorized by its year. When I click on each it displays the survey result as dropdown with an edit and delete button by its side of each survey. when I click on the edit button it moves to the edit page of that particular survey displaying all the fields of the survey in editable mode. The issue is that when I click on the recent years like 2011 or 2012 the details are displaying as dropdown and also in the edit page on clicking the edit button. But when I click on the older years like 2009 or 2007 it displays the details as dropdown but not in the edit page. When I click on the edit button of the older years it shows an "ArgumentOutOfRangeException" and the inner exception shows as "Null" although the details of that particular year displays as dropdown. This proves that the record are present for the older years but it does not displays in the edit page.

public void BindSurvey(Survey SelectedSurvey)
   {
       this.SelectedSurveyID = (int)SelectedSurvey.SurveyID;

       if (SelectedSurvey.SurveyDate != null)
       {
           string completedDay = SelectedSurvey.SurveyDate.Value.Day.ToString();
           string completedMonth = SelectedSurvey.SurveyDate.Value.Month.ToString();
           string completedYear = SelectedSurvey.SurveyDate.Value.Year.ToString();

           uxCompletedDateDay.SelectedValue = completedDay;
           uxCompletedDateMonth.SelectedValue = completedMonth;
           uxCompletedDateYear.SelectedValue = completedYear;
       }
       try
       {
           uxSurveyType.SelectedValue = SelectedSurvey.SurveyTypeID.ToString();
       }
       catch { }
       if (SelectedSurvey.SurveyTypeID != null && (int)SelectedSurvey.SurveyTypeID == 2)
       {
           ShowPupilFields(true);

           uxClassName.Text = SelectedSurvey.ClassName;
           uxClassSize.Text = SelectedSurvey.ClassSize.ToString();
           uxClassYear.Text = SelectedSurvey.Year;
       }
       else
       {
           ShowPupilFields(false);
       }
       SurveyTravelService surveyTravelsService = new SurveyTravelService();
       TravelModeTypeCollection travelModes = ApplicationCacheControl.TravelModes();

       int totalUsual = 0;
       int totalPreferred = 0;

       foreach (TravelModeType travelMode in travelModes)
       {
           string usualInputControlID = "uxUsual" + travelMode.TravelModeTypeID.ToString();
           string preferredInputControlID = "uxPreferred" + travelMode.TravelModeTypeID.ToString();

           TextBox uxUsual = (TextBox)FindControl(usualInputControlID);
           TextBox uxPreferred = (TextBox)FindControl(preferredInputControlID);

           if (uxUsual != null && uxPreferred != null)
           {
               SurveyTravel thisSurveyTravel = SelectedSurvey.SurveyTravels.Where(p => p.TravelModeTypeID == travelMode.TravelModeTypeID).FirstOrDefault();

               if (thisSurveyTravel != null)
               {
                   uxUsual.Text = thisSurveyTravel.Usual.ToString();
                   uxPreferred.Text = thisSurveyTravel.Preferred.ToString();
                   totalUsual += (int)thisSurveyTravel.Usual;
                   totalPreferred += (int)thisSurveyTravel.Preferred;
               }
           }
       }
       if (SelectedSurvey.SurveyTypeID != null && (int)SelectedSurvey.SurveyTypeID == 2
           && SelectedSurvey.ClassSize != null && SelectedSurvey.ClassSize != 0)
       {
           uxUTotal.Text = totalUsual.ToString() + " (" + Convert.ToInt32(((Convert.ToDecimal(totalUsual) / Convert.ToDecimal(SelectedSurvey.ClassSize)) * 100)).ToString() + "%)";
           uxPTotal.Text = totalPreferred.ToString() + " (" + Convert.ToInt32(((Convert.ToDecimal(totalPreferred) / Convert.ToDecimal(SelectedSurvey.ClassSize)) * 100)).ToString() + "%)";
       }
       else if (SelectedSurvey.School.NoOfStaff != null && SelectedSurvey.School.NoOfStaff != 0)
       {
           uxUTotal.Text = totalUsual.ToString() + " (" + Convert.ToInt32(((Convert.ToDecimal(totalUsual) / Convert.ToDecimal(SelectedSurvey.School.NoOfStaff)) * 100)).ToString() + "%)";
           uxPTotal.Text = totalPreferred.ToString() + " (" + Convert.ToInt32(((Convert.ToDecimal(totalPreferred) / Convert.ToDecimal(SelectedSurvey.School.NoOfStaff)) * 100)).ToString() + "%)";
       }
   }

The above is the code used. The exception occurs at the line "uxCompletedDateYear.SelectedValue = completedYear;"

When I debugged the code the value is been assigned to the completedYear but value is not been to the left side This happens only for the older years.

Can anyone please help me to fix this issue