Comments by samitrpatel (Top 4 by date)

You should use string.Join() because:

1) it's much more readable, maintainable and easy on the eyes.

2) it uses a StringBuilder internally already, so it's very efficient ( you can confirm yourself using Reflector).

string.Join() uses a StringBuilder for the general case of an IEnumerable<t> input. If you already have an array on the other hand it uses some voodoo magic (including FastAllocateString() and UnSafeCharBuffer) to be even faster.

agree with Kornfeld Eliyahu Peter

please dude there is a wrong solution it is use for ftp not for sftp my dear friend.