LINQ query is not retrieving saved data?

It sounds like you aren't rebinding your datagridview. After you save/update you should be calling refreshReservationDetail() again, and then you'll need to once again set the datasource to that variable and rebind it. If you are doing this asynchronously with an update panel or some such, you'll have to call refreshReservationDetail() at the end of the event that is fired for saving/updating.

If the page is posting back normally then just make sure your databinding to the gridview occurs regardless if it's a postback or not.

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