There are 3 way for querying against conceptual model in EF :
- LINQ to Entity
- Entity SQL
- Query Builder Methods
Which one is better for which situation? Is there any performance issues for these 3 type of querying?
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In general, all these ways are appropriate for production.
In case you plan to reuse the LINQ to Entities query use CompiledQuery.
There is a number of performance peculiarities in Entity Framework – take a look at this MSDN article.