Closest thing which could help you are Tuples.
C#7 maybe will have something like this:
public (int sum, int count) Tally(IEnumerable<int> values)
{
var res = (sum: 0, count: 0); // infer tuple type from names and values
foreach (var value in values) { res.sum += value; res.count++; }
return res;
}
(var sum, var count) = Tally(myValues); // deconstruct result
Console.WriteLine($"Sum: {sum}, count: {count}");
Link to discussion
Right now it is not possible.