Question

I simply add comma next to each word:

 foreach (DataRow row in ds.Tables[0].Rows)
 {                {
    sqlIn += row["personId"] + ", ";
 }

Then I remove the last comma which one is unnecessary:

 sqlIn = sqlIn.TrimEnd(' ', ',');

And I feel like in the days of classic ASP. Is there any C# version of what I do?

Answer 1

Further to Bas B answer Correct syntax is

 string s = String.Join(", ", ds.Tables[0].Select().Select(r => r["personID"].ToString()));

Here is working proof

using System;
using System.Linq;
using System.Data.Linq;
using System.Data;


    namespace ConsoleApplication5
    {
      class Program
      {

        static void Main(string[] args)
        {
          DataSet ds = new DataSet();

          DataTable dt = new DataTable();
          ds.Tables.Add(dt);
          string col = "personId";
          dt.Columns.Add(col, typeof(int));

          dt.Rows.Add(1);
          dt.Rows.Add(2);

          string s = String.Join(", ", ds.Tables[0].Select().Select(r => r["personID"].ToString()));

          Console.WriteLine(s);
          Console.ReadLine();

        }
      }

    }

---

Output will be

1, 2