Can you explain the principles of ACID in the context of transaction management in databases?

ACID is a set of properties that guarantee reliable transactions in a database:

• Atomicity — a transaction is completed in full or not at all. If something goes wrong, all changes are rolled back.

• Consistency — after a transaction, the database remains in a correct state, satisfying all constraints and rules.

• Isolation — parallel transactions do not affect each other, and the outcome is the same as if they were executed sequentially.

• Durability — after a transaction successfully completes, changes are saved in the database and are not lost even in case of failures.

In the context of C# and working with a database through, for example, Entity Framework, these principles are ensured by the transaction mechanism:

using (var transaction = context.Database.BeginTransaction())
{
    try
    {
        // database operations
        context.SaveChanges();
        transaction.Commit();
    }
    catch
    {
        transaction.Rollback();
        throw;
    }
}

Here, atomicity is achieved through commit/rollback, consistency through constraint checks, isolation through transaction isolation levels, and durability through saving data in a reliable storage.