Rimuovere Duplicati in DataTable

public DataTable cleanDataTable(DataTable dt)
        {
            DataTable dtCopy = new DataTable();
            dtCopy.Columns.Add(new DataColumn("ID"));
            dtCopy.Columns.Add(new DataColumn("Quant"));
            dtCopy.AcceptChanges();
            for (int i = 0; i < dt.Rows.Count; i++)
            {
                DataRow[] drc = dtCopy.Select("ID='" + dt.Rows[i][0].ToString() + "'");
                if (drc.Length==0)
                {
                    DataRow dr = dtCopy.NewRow();
                    dr[0]=dt.Rows[i][0];
                    dr[1] = dt.Rows[i][1];
                    dtCopy.Rows.Add(dr);
                }
            }
            dtCopy.AcceptChanges();
            return dtCopy;
        }