! (Logical Not) (SSIS)
Negates a Boolean operand.
|The ! operator cannot be used in conjunction with other operators. For example, you cannot combine the ! and the > operators into the !>. operator.|
Is any valid expression that evaluates to a Boolean. For more information, see Integration Services Data Types.
This example evaluates to FALSE if the Color column value is "red".
!(Color == "red")
!(@MonthNumber != MONTH(GETDATE())