how to do a select distinct in entity framework

I have a query that looks like this:

 var questions = from pmqs in Entities.ParticipantModuleQuestionnaireSummary
                            where pmqs.ParticipantModuleQuestionnaireID == ctx.ActiveParticipantModuleQuestionnaireID
                            orderby pmqs.SortOrder
                            select pmqs;
           

How can I change so it only get this data for each unique 'questionid', which is buried in the returned data?  If it helps, I'd be just as happy with selecting the unique SortOrder
d2foxAsked:
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Navneet.Net Full Stack DeveloperCommented:

Hi!

try this
var questions = from pmqs in Entities.ParticipantModuleQuestionnaireSummary
                            where pmqs.ParticipantModuleQuestionnaireID == ctx.ActiveParticipantModuleQuestionnaireID
                            orderby pmqs.SortOrder
                            select pmqs.Distinct()

Thanks!

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