Final answer:
To use LINQ with a data source, the data source must implement the IQueryable interface.
Step-by-step explanation:
To use LINQ with a data source, the data source must implement the IQueryable interface.
LINQ stands for Language Integrated Query and is a feature in C# that allows you to query and manipulate data in a strongly-typed manner. The IQueryable interface provides the functionality required for LINQ to work with the data source.
The IEnumerable interface can also be used with LINQ, but it provides a more limited set of query capabilities compared to IQueryable.