C# “LINQ Select N+1 Disaster” — Why Your Code Makes 500 SQL Calls

The classic mistake:

var users = db.Users.ToList();
var details = users.Select(u => GetDetails(u.Id)).ToList();

If GetDetails hits DB → N+1 query explosion.

✔ SOLUTION: Use Include or Join

var data = db.Users
    .Include(u => u.Details)
    .ToList();

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