Cheat sheets

C# syntax

Types, control flow, classes, records, pattern matching and more on one page.

LINQ

Filtering, projecting, sorting, grouping, joining and aggregating.

Async & concurrency

Tasks, await, WhenAll, cancellation, channels and the pitfalls to avoid.

dotnet CLI

Create, build, run, test, publish, packages, EF Core and user secrets.

HTTP & REST

Methods, status codes, headers and REST API conventions.

SQL

Queries, joins, grouping, data changes, indexes and transactions.

EF Core

DbContext setup, querying, saving, relationships and migrations.

ASP.NET Core

Program.cs, minimal APIs, DI lifetimes, middleware order, config and auth.