Database transactions ensure that multi-record (or in our case multi-document) operations either all succeed or all fail together.

This is absolutely critical for data consistency in your applications. EF Core has support for three different types of transactions: implicit, explicit, and ambient.

MongoDB's Queryable Encryption lets you encrypt sensitive database fields while keeping them searchable. Unlike traditional encryption-at-rest that renders data unreadable to the database, queryable encryption supports equality and range queries on encrypted fields without requiring decryption first.

For example, you can encrypt an employees email address and still query users.Where(u => u.Email == "john@example.com")users.Where(u => u.Email == "john@example.com") or encrypt salaries and query employees.Where(e => e.Salary > 50000m)employees.Where(e => e.Salary > 50000m) without any changes to your application code.

With the Microsoft.EntityFrameworkCore.Proxies NuGet package you can use to traverse navigation properties. This is often preferable to joins and includes such as when using one-to-many or only exploring a subset of the navigations based on client-side logic or for providers that don't support include yet.

This post will show you how to set up lazy loading with EF Core Proxies and MongoDB.