Entity Framework - Data bound combobox does not reflect changes made after inserting new data?

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I have a simple WPF window with DataGrid, Save button and ComboBox. The DataGrid is bounded to "students" table and ComboBox bounded to the same table, but with another CollectionViewSource: C# code: ComputerSchool. Computer_schoolEntities computer_schoolEntities = DataBaseHelper.

Ent; System.Windows.Data. CollectionViewSource studentsViewSource = ((System.Windows.Data. CollectionViewSource)(this.

FindResource("studentsViewSource"))); System.Data.Objects. ObjectQuery studentsQuery = computer_schoolEntities. Students; studentsViewSource.

Source = studentsQuery. Execute(System.Data.Objects.MergeOption. AppendOnly); System.Windows.Data.

CollectionViewSource studentsLookupViewSource = ((System.Windows.Data. CollectionViewSource)(this. FindResource("studentsLookup"))); System.Data.Objects.

ObjectQuery studentsLookupQuery = computer_schoolEntities. Students; studentsLookupViewSource. Source = studentsQuery.

Execute(System.Data.Objects.MergeOption. AppendOnly); The problem is that the ComboBox doesn't refresh it's items collection, when i'm inserting a new row in DataGrid, on the other hand, when i'm deleting or updating rows in DataGrid, the ComboBox refreshing just fine, even without context.SaveChanges(). I saw the same problem here - C# Entity Framework - Data bound combobox does not reflect changes made after .SaveChanges() , but after computerSchoolEntities.students.toList() the ComboBox doesn't react on any activity on DataGrid even after context.SaveChanges().

Anybody knows solution? C# wpf xaml data-binding entity-framework-4 link|improve this question edited Jan 8 at 15:58H.B.43k61645 asked Jan 8 at 15:55helcoder262.

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