> ## Documentation Index
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# C# Single-line Comment
A single-line comment in C# is a lexical construct that instructs the compiler to ignore all subsequent text on the current physical line. Initiated by a double forward-slash (`//`), it is an annotation mechanism that is entirely discarded during the lexical analysis phase of compilation.
**Syntax and Mechanics**
The C# compiler recognizes the `//` token and strips all characters that follow it until it encounters a *new-line* character or the end-of-file (EOF) marker. According to the C# language specification, the characters that qualify as a new-line to terminate a single-line comment include:
* Carriage return (`\u000D`)
* Line feed (`\u000A`)
* Next Line character (`\u0085`)
* Line separator (`\u2028`)
* Paragraph separator (`\u2029`)
Because it is strictly bound by these line-ending characters, a single-line comment does not require an explicit termination token.
```csharp theme={"dark"}
// The compiler ignores this entire line.
int counter = 0;
```
Single-line comments can be appended to the end of a valid C# statement. The compiler processes the executable code normally and halts evaluation for the remainder of the line once the `//` token is reached.
```csharp theme={"dark"}
int maxConnections = 100; // Lexical analysis ignores this portion
```
**Lexical Boundaries**
Because the comment is terminated by a newline character, it cannot inherently span multiple lines. To continue a single-line comment across a line break, the `//` token must be explicitly redeclared at the start of each subsequent line.
```csharp theme={"dark"}
// This sequence requires the token
// to be repeated on every physical line
// to prevent compilation errors.
string status = "Active";
```
**String Literal Exception**
The `//` character sequence loses its status as a comment token if it is enclosed within a string literal. In this context, the compiler treats it as standard string data rather than a lexical directive.
```csharp theme={"dark"}
string url = "https://example.com"; // The first // is string data; the second // begins a comment
```
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