Sort new record on the top of datagridview

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C#

Visual-Studio

WinForms

Hi,I wan to sort my added record on the top of datagridview.I had try a few way to sort it but it no function."attn_id"is a primary key in database.

using (TMPB_attn_DAL dalObj = new TMPB_attn_DAL())
     {
      dataGridView1.DataSource = dalObj.GetRecords().Cast<TMPB_attn>().ToList();
      dataGridView1.Refresh();
      dataGridView1.Sort(dataGridView1.Columns["attn_id"],ListSortDirection.Descending);
     }

when i run the above code it show out error!
Datagridview control must be bound to an iBindingList object to be sorted
how can i sort the record?