本文介绍了C#2005中标识符的使用规则，包括标识符可以使用的字符类型、起始字符的要求等，并举例说明了有效的标识符示例。值得注意的是，C#2005区分大小写。
Using Identifiers
Identifiers are the names you use to identify the elements in your programs. In C# 2005, you must adhere to the following syntax rules when choosing identifiers:
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You can use only letters (uppercase and lowercase), digits, and underscore characters.
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An identifier must start with a letter (an underscore is considered a letter).
For example, result, _score, footballTeam, and plan9 are all valid identifiers, whereas result%, footballTeam$, and 9plan are not.
IMPORTANT
C# 2005 is a case-sensitive language: footballTeam and FootballTeam are not the same identifier.
C# 2005 is a case-sensitive language: footballTeam and FootballTeam are not the same identifier.
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