how to convert any array to string

string s = new string(chars);

char[] chars = { 'a', 'b', 'c', 'd' };
string[] str = new string[chars.Length];
for (int i = 0; i < chars.Length; i++)
{
    str[i] = chars[i].ToString();
    Console.WriteLine(str[i]);
}
Console.ReadLine();