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    Microsoft .NET

    Microsoft .NET components, libraries & tools

    • EmailVerify for .NET
      Email validation library, featuring full IETF-compliant syntax validation, DNS checking, mailbox existence test and tools for advanced batch processing.
    • ProxyClient for .NET
      Powerful proxy client library with support for SOCKS 4, SOCKS 4a, SOCKS 5 and HTTP proxy servers, allowing to establish and accept remotely proxied connections.
    • MVC Extensions
      Powerful routing engine extensions for ASP.NET: allows to declare routes by way of attributes applied to MVC actions and generates URLs using compiler-safe lambda expressions.

    Microsoft Silverlight

    Microsoft Silverlight components, libraries & tools

    • EmailVerify for Silverlight
      Email validation library with Data Annotations support, featuring advanced syntax verification, ISP-specific syntax checks and disposable email address handling.

    Microsoft Visual Studio extensions

    Development tools, integrated into your favorite IDE

    • Routing Assistant
      FREE

      A cool and free Visual Studio extension which allows to easily browse, define, match and filter ASP.NET MVC routes within ASP.NET applications and web sites.

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    • EmailVerify for .NET
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    • ProxyClient for .NET
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    • MVC Extensions
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    • Routing Assistant reached version 1.7
      Published on Thursday, March 21, 2013

    • Verifalia: a new, complete hosted email validation service
      Published on Thursday, December 6, 2012

    • Routing Assistant v1.4 released
      Published on Friday, October 12, 2012

For developers For end-users

Email validation

- Syntax verification, according to IETF standards - DNS validations, including MX record(s) lookup - Disposable e-mail address (DEA) validation - SMTP connection and availability checking - Mailbox existence checking - Catch-all testing

For developers

EmailVerify.NET is the best choice for Microsoft .NET developers who need email address validation in their solutions. It features a very fast, multi-threaded verification library that can validate hundreds of email addresses per minute.

For end users

Our hosted email validation service allows to validate lists of email addresses with ease, combining the power of our email validation technologies with an array of dedicated servers and a modern web 2.0 interface.

Products showcase

EmailVerify for .NET

EmailVerify for .NET is a powerful Microsoft .NET software component that validates email addresses with various tools, including:
  • Advanced syntax verification, according to IETF standards (RFC 1123, RFC 2821, RFC 2822, RFC 3490, RFC 3696, RFC 4291, RFC 5321, RFC 5322 and RFC 5336), with support for quoted words, domain literals, non-ASCII domain names (IDNA) and mailboxes, and comments
  • ISP-specific syntax check (Gmail, Yahoo, Hotmail, Aol, Rediff and many others supported)
  • DNS validations, including MX record(s) lookup
  • Disposable and temporary email address detection
  • SMTP connection and availability checking
  • Mailbox existence checking, with greylisting and temporary unavailability support
  • Catch-all testing
Read more

MVC Extensions

Cobisi MVC Extensions (formerly SEO Extensions) is an advanced tool for software developers that allows to optimize ASP.NET MVC web applications and sites for search engines. It comes with a powerful routing engine, which extends the standard ASP.NET routing module to provide a much more flexible way to define search optimized routes, and a complete set of classes that make customizing the entire routing infrastructure very easy.

In addition to that, MVC Extensions optionally integrates with Visual Studio (by way of our free Routing Assistant extension) and allows developers to easily explore the routes exposed by their websites, while also offering coding assistance for SEO routes without leaving the IDE.
Read more

ProxyClient for .NET

ProxyClient for .NET is a proxy client component targeted at the Microsoft .NET platform, which allows to easily establish proxied connections from both new and existing sockets (and TcpClient instances). As of version 2.0, it can also listen for and accept incoming connections established against a remote proxy server, as if they were accepted locally. ProxyClient for .NET supports the following proxy protocols:

  • SOCKS v4
  • SOCKS v4a
  • SOCKS v5
  • HTTP-CONNECT proxy

Read more


Featured clients

Cobisi has risen to prominence as a leader provider in software development solutions, across a multitude of industries. Our product has shown proven success among dozens of Fortune 500 and industry-leading enterprise corporations.

About Cobisi

Cobisi is a leading provider of software development tools for the Microsoft .NET platform, catering to the increasing demand for advanced and innovative software solutions within today's enterprise markets.

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