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Creating a list of comma separated values using String.Join()

I’ve seen a lot of extension methods that allowed you to create a list of comma separated values. 
public static string ToCSV(this IEnumerable<string> input)
{
 var temp = String.Empty;
 
 foreach (var entry in input) {
  if (String.IsNullOrEmpty(temp)) {
   temp = entry;
 }
 else 
 {
  entry += ", " + entry;
 }
 return temp;
}

I even created a similar extension method myself until I discovered the String.Join method while reading this blog post by Scott Hanselman:
var temp = String.Join(", ", input)
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