Question : converting sql to linq not working

public static DataSet GetItemLists(int group_code)
        {
                          //converting following sql command to linq            
      //         string sql = "SELECT Distinct parent_sku, group_code, parent_sku, description "
      //                + "FROM item_view "
      //                + "WHERE group_code=@group_code ";

            using (WellsMusDataContext dc = new WellsMusDataContext())
           {

               List<item_view> query1 = (from item in dc.item_views
                                     where item.group_code == group_code
                                     select item).Distinct().ToList<item_view>();



               
              //this is my custom class that converts list to dataset
                CollectionToDataSet<List<item_view>> c = new CollectionToDataSet<List<item_view>>(query1);
                return c.CreateDataSet();
 
}
but it gives repeating data which is not distinct Can any body help me on this?
thank you

Answer : converting sql to linq not working

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