Merge Duplicate Rows on a datatable

class Program
   {
       static void Main(string[] args)
       {

           DataTable dt = new DataTable();
           dt.Columns.Add("Name", typeof(string));
           dt.Columns.Add("Result", typeof(string));

           dt.Rows.Add("John", "1,2,3,4,5");
           dt.Rows.Add("Mary ", "5,6,7,8");
           dt.Rows.Add("John", "6,7,8,9");

           DataTable dtRsult = dt.Clone();
           var distinctRows = dt.DefaultView.ToTable(true, "Name").Rows.OfType<datarow>().Select(k => k[0] + "").ToArray();
           foreach (string name in distinctRows)
           {
               var rows = dt.Select("Name = '" + name + "'");
               string value = "";
               foreach (DataRow row in rows)
               {
                   value += row["Result"] + ",";
               }
               value = value.Trim(',');

               dtRsult.Rows.Add(name, value);
               value = "";


           }

           var output = dtRsult; // dtRsult has the output, which u needed.



       }

   }