Question

having a List<int> of integers (for example: 1 - 3 - 4)
how can I convert it in a string of this type?

For example, the output should be:

string values = "1,3,4";

Answer 1

Another solution would be the use of Aggregate. This is known to be much slower then the other provided solutions!

var ints = new List<int>{1,2,3,4};
var strings =
            ints.Select(i => i.ToString(CultureInfo.InvariantCulture))
                .Aggregate((s1, s2) => s1 + ", " + s2);

See comments below why you should not use it. Use String.Join or a StringBuilder instead.