using System.Collections.Generic;
using System.Linq;
using System.Text;
public static class CollectionExtensions
{
public static string ToCommaString(this IEnumerable tArray)
{
if (tArray.Count() == 0) return string.Empty;
var buffer = new StringBuilder();
int count = 0;
bool end = false;
foreach (var t in tArray)
{
if (count == tArray.Count() - 1) end = true;
if (end)
buffer.AppendFormat("{0}", t.ToString());
else
buffer.AppendFormat("{0},", t.ToString());
count++;
}
return buffer.ToString();
}
}