---
id: csharp-variables-identifiers
title: "C# Identifiers"
category: "Programming_Language"
status: "draft"
verification_status: "conceptual"
canonical_id: ""
aliases: ["variable naming rules C#", "C# 식별자"]
duplicate_of: ""
source_trust_level: "B"
confidence_score: 0.83
created_at: 2026-07-04
updated_at: 2026-07-04
review_reason: ""
merge_history: []
tags: ["csharp", "programming-language", "w3schools", "identifiers", "naming"]
raw_sources: ["https://www.w3schools.com/cs/cs_variables_identifiers.php"]
applied_in: []
github_commit: ""
---

# [[CSharp Identifiers]]

## 🎯 한 줄 통찰 (One-line insight)
C#'s identifier rules (letters/digits/underscore, must start with letter/underscore, case-sensitive, no reserved words) are the same rule-set every C-family language in this series has used verbatim — the interesting detail isn't the rule itself but the STYLE convention layered on top: C# explicitly recommends lowercase-starting names (camelCase, e.g. `minutesPerHour`), which will matter later when C#'s method/class names are shown starting with an UPPERCASE letter (PascalCase) — a naming-convention split by identifier kind that C and C++ never enforced this explicitly. [S1]

## 🧠 핵심 개념 (Core concepts)
- **Identifier** — the unique name given to a variable. [S1]
- **Character rules** — letters, digits, and underscore (`_`) allowed; must begin with a letter or underscore (never a digit). [S1]
- **Case sensitivity** — `myVar` and `myvar` are distinct variables. [S1]
- **No whitespace** — names cannot contain spaces. [S1]
- **No reserved words** — C# keywords like `int` or `double` cannot be used as identifier names. [S1]
- **Style convention (recommended, not enforced)** — start with a lowercase letter; prefer descriptive names (`minutesPerHour`) over terse ones (`m`) for readability and maintainability. [S1]

## 📖 세부 내용 (Details)
- Good vs. acceptable naming contrast: `int minutesPerHour = 60; // Good` vs `int m = 60; // OK, but not so easy to understand`. [S1]

## ⚖️ 모순 및 업데이트 (Contradictions & updates)
- **명명 규칙 자체는 C/C++/Java와 동일**: 문자/숫자/언더스코어, 숫자로 시작 불가, 대소문자 구분, 예약어 사용 불가라는 규칙이 이전 언어들과 동일함이 확인됨 — 차이는 규칙이 아니라 스타일 권장(lowercase 시작, 서술적 이름 선호)에 있음. [S1]

## 🛠️ 적용 사례 (Applied in summary)
현재 발견된 실제 적용 사례가 없습니다 — minutesPerHour vs m 이름 비교가 원문에서 스타일 예제로 제시됨. [S1]

## 💻 코드 패턴 (Code patterns)
Descriptive vs. terse identifier naming (C#):
```csharp
// Good
int minutesPerHour = 60;
// OK, but not so easy to understand what m actually is
int m = 60;
```

## ✅ 검증 상태 및 신뢰도
- **상태:** draft
- **검증 단계:** conceptual
- **출처 신뢰도:** B (W3Schools — widely used educational reference, not a primary standards body)
- **신뢰 점수:** 0.83
- **중복 검사 결과:** 신규 생성 (New discovery)

## 🔗 지식 그래프 (Knowledge Graph)
- **상위/루트:** [[C# Tutorial]]
- **관련 개념:** [[CSharp Variables]], [[CSharp Variables Constants]]
- **참조 맥락:** Variables 섹션 — Constants 챕터로 이어짐.

## 📚 출처 (Sources)
- [S1] W3Schools — C# Identifiers — https://www.w3schools.com/cs/cs_variables_identifiers.php

## 📝 변경 이력 (Change history)
- 2026-07-04: Initial draft synthesized from the W3Schools "C# Identifiers" page (Astra wiki-curation, P-Reinforce v3.1 format).