IEnumerable(string).Join
Joins a series of strings connected by a separator.
Source
public static string Join(this IEnumerable<string> source, string separator) => String.Join(separator, source);Example
var strings = new List<string> { "Ace", "Bil", "Cal", "Dan" };
var everyone = strings.Join(", "); // returns "Ace, Bil, Cal, Dan"