asp.net - Error displaying details (ObjectContext instance has been disposed) -

i'm building asp.net mvc 3 app , i've got model looks so:

public partial class flavor {    // ...    public string name { get; set; }    public bool hasnuts {get; set; }    public virtual icollection<saledata> sales {get; set;}    // ... } 

which retrieves data db such:

public partialviewresult details(int id) {    using (var db = new icecreamdbflavors())    {       flavor someflavor = db.flavors.find(id);       someflavor.sales = db.sales.where(c => c.flavorid == id).tolist();       return partialview("details", someflavor);          } } 

over on view this:

<fieldset>    <legend>sales data</legend>    @foreach (var sale in model.sales)    {       <div>weekly</div>       <div>@sale.weekly</div>    } </fieldset> 

if don't retrieve sales data, flavor data displays fine no errors, adding call retrieve list of sales data causes error "the objectcontext instance has been disposed , can no longer used operations require connection." occur.

i've read few other posts , guess i'm missing here. believe error happens due lazy loading, @ least based on i've read here , elsewhere. setting breakpoint in controller before returning partialview , checking object, believe, causes evaluation take place, displays want.

i under impression tolist() call force sales collection filled in. since don't have issue when line's commented out, assume problem still related , when view attempting iterate sales, can't. correct here? guess thought forcing evaluation. how resolve this?

don't dispose icecreamdbflavors class inherits objectcontext, needs have lifetime greater allowed.

change

using (var db = new icecreamdbflavors()) {   flavor someflavor = db.flavors.find(id);   someflavor.sales = db.sales.where(c => c.flavorid == id).tolist();   return partialview("details", someflavor);       } 

to

try {     var db = new icecreamdbflavors();      flavor someflavor = db.flavors.find(id);     someflavor.sales = db.sales.where(c => c.flavorid == id).tolist();     return partialview("details", someflavor);     } catch(exception ex) {     // log exeption }