copying specific records from one datatable to another datatable

hi im trying to copying specific record from one datatable to another datatable i used below code

 public System.Data.DataTable selectspecificdatarow(System.Data.DataTable dtg, int count, int startindex)
        {
            System.Data.DataTable dtn = dtg.Clone();
            for (int i =startindex; i < count; i++)
            {
                dtn.ImportRow(dtg.Rows[i]);
            }

            return dtn;
        }
      

its taking too long time in cloneing is there any better way to do this task which is Time effecent