Selecting value from IEnumerable

Should be simple I think, but when a result is stored in IEnumerable in Radzen how would I select one of the values to set a property?

See the above, how would I select a single value out of getBbsRatingsForAscendingDescendingRatingResult the value pairs are id and Rating.

You can use IEnumerable extension methods like FirstOrDefault()

Is there an example of this?