KnowledgeForwardSolutions 

An extensive collection of optimized check digit algorithms suitable for a wide range of applications

Library of guard clauses with a wide range of validations available. Supports custom messages and exceptions in addition to standard defaults.

CheckDigits.Net.Annotations extends CheckDigits.Net and provides custom DataAnnotation classes for validating that a string property includes a valid check digit according to a wide variety of check digit... More information

CheckDigits.Net.FluentValidation integrates CheckDigits.Net with FluentValidation and supports adding check digit validation in your validation classes.