String.Format(). How to change new?

[Veronika14]

how to change the format 9202566684 on +7(920) 256-66-84?

[Frinavale]

Something like this would work:

String original = "9202566684"
String.Format("+7({0}} {1}-{2}-{3}", original.Substring(0, 2), original.Substring(3, 5), original.Substring(5, 2),original.Substring(6, 7), original.Substring(8,9));

-Frinny