Convert array of integers to comma-separated string

Question

It's a simple question; I am a newbie in C#, how can I perform the following

• I want to convert an array of integers to a comma-separated string.

I have

int[] arr = new int[5] {1,2,3,4,5}; 

I want to convert it to one string

string => "1,2,3,4,5" 

Answer 1

var result = string.Join(",", arr); 

This uses the following overload of string.Join:

public static string Join<T>(string separator, IEnumerable<T> values); 

Answer 2

.NET 4

string.Join(",", arr) 

.NET earlier

string.Join(",", Array.ConvertAll(arr, x => x.ToString()))