Question

Hi could you help me with this error?
Cannot access a disposed object.
Object name: 'DataContext accessed after Dispose.'.

in my GUI

 private void InitializePage()
    {
        cbCategory.DataSource = stock.StockCategory.Get();

    }

in Datamodel

 public IEnumerable<StockCategory> Get()
    {
        using (leDataContext db = new leDataContext())
        {
            try
            {
                var r = from s in db.StockCategories
                        select s;
                return r;
            }
            catch (Exception ex)
            {
                Logger.Error(typeof(StockCategory), ex.ToString());
                throw;
            }

        }

    }

Answer 1

You’re disposing the DataContext but returning something that still depends on it.

Options:

• Don’t dispose the DataContext. I know this sounds weird, but guidance from the LINQ to SQL team (well, Matt Warren) has indicated that in most cases (i.e. if you’re not doing anything out of the ordinary) disposal is not required
• Call ToList() inside the Get() method’s using block.

Note that using a query expression with just a degenerate query is reasonably pointless. (If this is within your own code, even the implicit Select(s => s) won’t actually be useful.)

I would suggest changing your method to:

public IList<StockCategory> GetAllStockCategories()
{
    using (leDataContext db = new leDataContext())
    {
        return db.StockCategories.ToList();
    }
}