---
title: "Boolean"
slug: "boolean"
updated: 2025-10-07T09:58:29Z
published: 2025-10-07T11:45:21Z
canonical: "help.mail-and-deploy.com/boolean"
---

> ## Documentation Index
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# Boolean

### General

Values of type Boolean can have either of two states: True or False. A detailed explanation of the data-type can be found in the  Boolean Data-Type article of the Visual Basic .NET language documentation.

### Constants

Constant boolean values are written by using the keywords True and False. The following expression returns the boolean value True:

          Mail & Deploy Expression

          

True

The following expression returns the boolean value False:

          Mail & Deploy Expression

          

True

### Operators

The following operators can be used with boolean values:

| Operator | Description |
| --- | --- |
| Not | This operator inverts the boolean value following the operator; Not True will therefore return False and Not False returns True. |
| And | This operator performs a logical And operation which will only return True if both values on either side of the operator are True. |
| Or | This operator performs a logical Or operation which will return True if at least one of the values on either side of the operator is True. |