# Visual Basic Runtime Library Members

The Microsoft.VisualBasic namespace contains the classes, modules, constants, and enumerations that constitute the Visual Basic runtime library. These library members provide procedures, properties, and constant values you can use in your code. Each module and class represents a particular category of functionality.

## Microsoft.VisualBasic.Conversion Module

ErrorToString Fix Hex Int
Oct Str Val

## Microsoft.VisualBasic.Financial Module

DDB FV IPmt IRR
MIRR NPer NPV Pmt
PPmt PV Rate SLN
SYD

## Microsoft.VisualBasic Constants and Enumerations

The Microsoft.VisualBasic namespace provides constants and enumerations as part of the Visual Basic run-time library. You can use these constant values in your code. Each enumeration represents a particular category of functionality. For more information, see Constants and Enumerations.