Selecting count in LINQ

Question

I got a SQL Server table with columns ResolvedDate and ResolvedBy.

Now I want to select those two columns and count their results, which I

Answer 1

var dates = dataContext.Activities
    .Where(a => a.IsResolved && a.ResolvedBy == userId)
    .Select(a => a.ResolvedDate)
    .ToList();

var count = dates.Count;

If you only want to get the count, you can make it much faster by selecting the count alone:

var count = dataContext.Activities
    .Count(a => a.IsResolved && a.ResolvedBy == userId);