Appending a string in a loop in effective way

Question

for long time , I always append a string in the following way.

for example if i want to get all the employee names separated by some symbol , in the below example i

Answer 1

I like using the aggregate function in linq, such as:

string[] words = { "one", "two", "three" };
var res = words.Aggregate((current, next) => current + ", " + next);