Comma “izing” a list of items

Question

Given a list of strings, what is the best method for concatenating these strings into a comma separated list with no comma at the end. (VB.NET or C#) (Using either StringBuilder

Answer 1

or you can do:

Separator = ""
For Each Item In Collection
  Add Separator + Item To String
  Separator = ", "

By setting the separator to an empty string in the first iteration you skip the first comma. One less if statement. This might or might not be more readable depending on what you're used to