Question

I have the following datatable :

id  name   name_in

 3   sys     sys

 5   con     con_r

 5   con     con_s

 5   con     con_g

I want to get the following datatable from it :

3    sys

5    con

How to do this?

I do the following

var groups = Process_dt.AsEnumerable()
    .GroupBy(r => r.Field<Int16>("id"));

but how to put the result in another datatable .

Answer 1

GroupBy will return you an IGrouping collection which you can iterate the following way:

var dataTable = new DataTable();
dataTable.Columns.Add("id", typeof(Int16));
dataTable.Columns.Add("name_in", typeof(string));
foreach (var group in groups)
{
  dataTable.Rows.Add(group.Key, (group.First())["name_in"]);
}