Question

in my silverlight page I am fetching the data through WCF
WCF is returning an BusinessEntityCollection that is the collection of rows

SqlParameter[] sqlParameter = new SqlParameter[]{new SqlParameter("@recordType",recordType)};
                MenuEntity menuEntity;
                MenuEntityCollection menuEntityCollection = new MenuEntityCollection();
                using (SqlDataReader sqlDataReader = SqlHelper.ExecuteReader(_ConnectionString,CommandType.StoredProcedure, <br>StoredProcedures.GetMenus, sqlParameter))
                {
                    if (sqlDataReader.Read())
                    {
                        menuEntity = new MenuEntity();
                        DataAccessHelper.GetEntity(sqlDataReader, menuEntity);
                        menuEntityCollection.Add(menuEntity);
                    }
                }
                return menuEntityCollection;

–> in silverlight page when I am calling WCF there I am getting an error
MenuEntity menuList = new MenuEntity();
menuList = e.Result; <—–error line

error: Cannot implicitly convert type
‘System.Collections.ObjectModel.ObservableCollection‘ to ‘FastTrackSLUI.AdminServiceReference.MenuEntity’

Answer 1

write line [CollectionDataContract] before the MenuEntityCollection Class–

[CollectionDataContract]
public class MenuEntityCollection : BusinessEntityCollectionBase
{
public MenuEntityCollection()
{
}
}

now it is working.