.NET (C#)

Casing Rules

Element	Convention	Example
Classes	`PascalCase`	`OrderService`, `UserRepository`
Interfaces	`PascalCase` with `I` prefix	`IPaymentProcessor`, `IUserRepository`
Enums	`PascalCase`	`PaymentMethod`, `OrderStatus`
Enum members	`PascalCase`	`PaymentMethod.CreditCard`
Methods	`PascalCase`	`GetUserById`, `ProcessPayment`
Properties	`PascalCase`	`FirstName`, `IsActive`
Private fields	`camelCase` with `_` prefix	`_userRepository`, `_logger`
Local variables	`camelCase`	`userCount`, `isValid`
Parameters	`camelCase`	`userId`, `orderRequest`
Constants	`PascalCase`	`MaxRetryCount`, `DefaultTimeout`
Namespaces	`PascalCase.Dot.Separated`	`Acmeco.Retail.Orders.Services`

One primary type per file. File name matches the type name.

# Good:
OrderService.cs
IUserRepository.cs
PaymentMethod.cs         # enum

# Tests:
OrderServiceTests.cs
UserRepositoryIntegrationTests.cs

Namespaces mirror the folder structure:

{Company}.{Org}.{Solution}.{Layer}

Acmeco.Retail.Orders.Services
Acmeco.Retail.Orders.Repositories
Acmeco.Retail.Orders.Models