Datatable中linq查询

Code SnippetDataTable dt1 = new DataTable();            dt1.Columns.Add("CkNodeDz");            dt1.Columns.Add("Rssi");            dt1.Columns.Add("DwNodeDz");            dt1.Rows.Add("0001", "7.5", "0005");            dt1.Rows.Add("0002", "4", "0005");            dt1.Rows.Add("0003", "9.9", "0005");            dt1.Rows.Add("0004", "7.6", "0005");            var dataSource = from order in dt1.AsEnumerable()                             where order.Field<string>("DwNodeDz") == "0005"                             orderby order.Field<string>("Rssi")                             select order;            dataGridView1.DataSource = dataSource.CopyToDataTable();