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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. 
// 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. 
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. 
// 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. 
string url = "https://example.com"; // The first // is string data; the second // begins a comment
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