When do you use semicolon in C# and why?

In C# there can are two kinds of statements.

• Simple single line statements - this kind of statement requires a semicolon at the end of a statement. Thanks to this you can use multiple simple statements on the same line.
• Compount statements (block statements) - this kind of statement is enclosed in {} brackets and for that reason doesn't need a semicolon at the end of a statement as the end of a statement is marked by the closing curly bracket.

The semicolon isn't the line terminator. It's the statement terminator.