IEnumerable to string delimited with commas?

Question

I have a DataTable that returns

IDs ,1 ,2 ,3 ,4 ,5 ,100 ,101 

I want to convert this to single string value, i.e:

,1,2,3,4,5,100,101 

How can i rewrite the following to get a single string

var _values = _tbl.AsEnumerable().Select(x => x); 

Answer 1

var singleString = string.Join(",", _values.ToArray() ); 

Answer 2

Write an extension method such as

public static String AppendAll(this IEnumerable<String> collection, String seperator) {     using (var enumerator = collection.GetEnumerator())     {         if (!enumerator.MoveNext())         {             return String.Empty;         }          var builder = new StringBuilder().Append(enumerator.Current);          while (enumerator.MoveNext())         {             builder.Append(seperator).Append(enumerator.Current);         }          return builder.ToString();     } } 

and assuming the result of your previous expression is IEnumerable<String>, call:

var _values = _tbl.AsEnumerable().Select(x => x).AppendAll(String.Empty);