FEVOR Validation Library

FEVOR Validation Library

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FEVOR Validation Library - CodeCanyon Item for Sale

FEVOR is an abbreviation for Fluent Extensible Validator and it’s a .NET validation library with lots of features that simplify the validation process in development by abstracting away the complex logic of conditional statements.


  • it can be used on any .NET project
  • removes conditional statements clutter by making use of a fluent syntax;
  • no need to learn any attributes or interfaces to extend it (it’s all based on extension methods);
  • makes validation code readable even for non-developers, making it easy to maintain it;
  • contains type-specific validation rules, but also generic rules that can be used on any type;
  • gives you two options of extending it;
  • has a built-in system for failure handling;
  • choose from four types of warning methods, or use different ones on each validation group;
  • has full support for NULL values/objects;
  • has built-in error messages that can be easily overridden with your own;
  • has a rich set of validation rules for the most common needs of a developer.

Included in the package

  1. The library’s source code which is heavily documented using XML tags;
  2. A WinForms demo application;
  3. Full API documentation in HTML and PDF format, with examples;
  4. A complete PDF tutorial with 3 levels full of code samples, explaining every feature of this library;
  5. A diagram exposing every member of this library.


  • .NET Framework 4.0;
  • Works on any type except dynamic types.

Sample code

Here’s a quick sample code to give you an idea of how FEVOR will enhance your validation process:

        .IsLongerThan(1, "string too short")
        .IsAlpha("the string should have only letters!")
        .IsValidHexColor("this is not a valid HEX color");


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