ASP.NET in line string comparison -

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i've inherited code displays list of calendar events start date , end date. values come sql db through stored procedure, making way onto aspx page.

if event starts , ends on same day don't want display end date. despite having visually compared data, attempt implement using inline snippet below has failed , continues show enddate:

<%# (eval("edate") == eval("sdate")) ? "blank" : "enddate" %>

any advice on i'm doing wrong? or how implement on stored procedure side? code generating there is: 

    sdate =         case             when str(day(startdate)) = 1 datename(mm, [startdate])+' '+ltrim(str(day(startdate)))+ 'st' + ', '             when str(day(startdate)) =2 datename(mm, [startdate])+ ' ' +ltrim(str(day(startdate)))  + 'nd' + ', '             when str(day(startdate)) =3 datename(mm, [startdate])+ ' ' +ltrim(str(day(startdate))) + 'rd'+ ', '            when str(day(startdate)) =21 datename(mm, [startdate])+ ' ' + ltrim(str(day(startdate)))  + 'st' + ', '             when str(day(startdate)) =22 datename(mm, [startdate])+ ' ' +ltrim(str(day(startdate)))  + 'nd' + ', '             when str(day(startdate)) =23 datename(mm, [startdate])+ ' ' + ltrim(str(day(startdate)))+ 'rd'+ ', '             when str(day(startdate)) =31 datename(mm, [startdate])+ ' ' +ltrim(str(day(startdate)))  + 'st' + ', '      else datename(mm, [startdate])+ ' ' +ltrim(str(day(startdate)))+ 'th'+ ', '         end,      edate =     case         when str(day(enddate)) = 1 datename(mm, [enddate])+' '+ltrim(str(day(enddate)))+ 'st' + ', '        when str(day(enddate)) =2 datename(mm, [enddate])+ ' ' +ltrim(str(day(enddate)))  + 'nd' + ', '        when str(day(enddate)) =3 datename(mm, [enddate])+ ' ' +ltrim(str(day(enddate))) + 'rd'+ ', '        when str(day(enddate)) =21 datename(mm, [enddate])+ ' ' + ltrim(str(day(enddate)))  + 'st' + ', '        when str(day(enddate)) =22 datename(mm, [enddate])+ ' ' +ltrim(str(day(enddate)))  + 'nd' + ', '        when str(day(enddate)) =23 datename(mm, [enddate])+ ' ' + ltrim(str(day(enddate)))+ 'rd'+ ', '        when str(day(enddate)) =31 datename(mm, [enddate])+ ' ' +ltrim(str(day(enddate)))  + 'st' + ', '  else datename(mm, [enddate])+ ' ' +ltrim(str(day(enddate)))+ 'th'+ ', '    end


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