List of Free code Validation
Classic Validation Controls for ASP.NET MVC
This library is complete set of Validation Controls for ASP.NET MVC imported from ASP.NET WebForms in MVC Style, which are used in WebForms. It makes client side validation easier both for Developer and Designer with less code. It's developed in C#.
DAValidation makes it easier to develop and maintain ASP.NET Web Forms input validation with Data Annotations attributes. All validation logic unified in one control per field.
DAValidation borrowed the idea from ASP.NET MVC input validation model but uses original Web Forms ...
Enhanced forms extends the regular ASP.NET input and validation controls to give some flare to your projects and provide new features which makes the user experience much nicer. For a demonstration please visit http://www.ronald-douglas.com/Projects
Generic Validation.NET is a flexible lightweight validation library for .NET, that can be used by any .NET project: ASP.NET Web Forms, ASP.NET MVC, but also Windows Forms.
It is entity centric, with tagging, fluent syntax, and maximum flexibility of the error messages.
A bunch of predefined controls that wraps input mask, jQuery UI widgets and validations to make ASP.Net WebForms even faster to build
MVC Demo Project - 2
This is a demo application that demonstrated different methods to apply data validation in ASP.NET MVC 4.
MVC Foolproof Validation
MVC Foolproof Validation aims to extend the Data Annotation validation provided in ASP.NET MVC. Initial efforts are focused on adding contingent validation.
NBouncer is a Context Aware Validation framework without attributes for .NET 3.5 Winforms, WPF, Silverlight or Asp.NET MVC
SpecExpress : A Fluent Validation Framework
SpecExpress is a fluent validation framework and container for .Net that makes it easier to write validation rules and validate your objects. SpecExpress also offers integration with ASP.NET WebForms, eliminating duplication of your validation rules.
Username Availability Validator
The Username Availability Validator is an ASP.NET server control which provides asynchronous indication of username availability, for use in new user registration functionality.
Validator Toolkit for ASP.NET MVC
The Validator Toolkit provides a set of validators for the ASP.NET MVC framework to validate HTML forms on the client and server-side using validation sets. By defining a validation set, e.g. a LoginValidationSet class, the toolkit will generate code.
xVal is a validation framework for ASP.NET MVC applications. It makes it easy to link up your choice of server-side validation mechanism with your choice of client-side validation library, neatly fitting both into ASP.NET MVC architecture and conventions.
xVal for WebForms
Validate ASP.NET WebForms better with attribute-based rules for server and client side validation. (The project used to be built on xVal, before it was deprecated)