Let’s explore the difference between IEnumerable, and IQueryable in C# and which interface to use in which case, let’s see.

Here are the differences between IEnumerable and IQuerable:

• IEnumerable is an interface in the System. Collections namespace, whereas IQueryable is an interface in the System.Linq namespace.
• IEnumerable is used for in-memory collection queries, whereas IQueryable is suitable for querying data from out-of-memory collections, such as remote databases or services.
• IEnumerable is beneficial for LINQ to Object, while IQueryable is beneficial for LINQ to SQL.
• Both support deferred execution, but IEnumerable does not support lazy loading, whereas IQueryable supports lazy loading.
• IEnumerable doesn’t support custom queries, while IQueryable supports custom queries using CreateQuery and executes methods.
• IEnumerable does not run filters on the server side. While IQueryable executes a “select query” on the server side with all filters. When querying data from a database.
• Both can only move forward over a collection.
• The IQueryable interface inherits from IEnumerable, so it can prefer everything that IEnumerable can do.

Summarizes the key differences between IEnumerable and IQueryable:

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