Visual C# 2005 Guide
Relational Operators

Relational operators are used in Boolean expressions (expressions which evaluate to either true or false) when we want to test things in our programs.

DescriptionIn C#
Equal to==
Less than<
Greater than>
Not equal to!=
Less than or equal to<=
Greater than or equal to>=

Boolean Operators

In addition to the relational operators, the boolean operators, NOT, AND, OR can also be used in boolean expressions.

! (Number < 30)Number is not less than 30
(Number > 5) && (Number < 30)Number is greater than 5 and less than 30
(Number < 5) || (Number > 30)Number is less than 5 or Number is greater than 30