Question

i have a datatable:

+----------+--------+
| Rep Name | Volume |
+----------+--------+
| Alex     |      9 |
| Alex     |      1 |
| Alex     |      3 |
| Liza     |     24 |
| Liza     |     17 |
| Pam      |      0 |
| Pam      |      6 |
+----------+--------+

i am sending ONE email for every UNIQUE person in REP NAME

example:

Hi Alex, Today your volume was 9, and 1, and 3.

next email:

Hi Liza, Today your valume was 24, and 17.

i would like to know the easiest way to loop through the datatable on unique values of REPNAME

something like:

 var DistinctList = datatable123.Select(x=> x.repname).Distinct();

and then i would loop through DistinctList ?

Answer 1

You should use GroupBy for this task.

Update: I’ve rewritten the code so you can now use it with your DataTable.

var list = from x in datatable123.AsEnumerable()
           group x by (string) x["repname"] into g
           select g;

foreach (var x in list)
{
   Console.WriteLine("Hi {0}, Today your volume was {1}.", x.Key,
      String.Join(", and ", x.Select(p => p["volume"])));
}