Protect your .NET code and IP with SmartAssembly

Download 14-day free trial

Introduction to SmartAssembly

Redgate's .NET obfuscator

SmartAssembly is an obfuscator that helps protect your application against reverse-engineering or modification, by making it difficult for a third-party to access your source code.

If your entire business rests on the IP embodied in your software or you don't want your C# or VB.NET code exposed internationally, then obfuscating your code becomes a necessity, not a luxury.

With SmartAssembly, you get a comprehensive set of obfuscation features, including name mangling, control flow obfuscation, strings encoding, reference dynamic proxy, and declarative obfuscation.

$995  per production build machine

Download free trial

An example of obfuscation

Before obfuscation

Before obfuscation

After obfuscation

After obfuscation

3 ways SmartAssembly will improve your software


.NET applications can be easy to disassemble if they haven't been obfuscated, which can be a problem if you've invested time, effort, and money in your code. Obfuscating your code is easy to do and adds a barrier of protection against reverse-engineering and modification.

Multiple forms of obfuscation and optimization

Code obfuscation makes your application hard to reverse-engineer, removes non-useful code, and compresses dependencies, protecting and compacting your application with a minimum of fuss.

Key features

Name mangling

Changes the names of methods and fields to make it hard to understand their purpose.

Control flow obfuscation

Converts the code inside methods to 'spaghetti code' to make it difficult to see how the application works.

References dynamic proxy

Creates a proxy for calls to methods outside of your assembly to make it hard to find external calls.

Strings encoding

Encodes the strings used in your software to hide such information as passwords and SQL queries.

Resources compression and encryption

Compresses and encrypts managed resources to make them hard to understand, and to reduce the size of the assembly.


Removes non-useful metadata to make the code harder to reverse-engineer, reduce the size of the assembly, and improve loading time.

Dependencies merging

Takes all the DLLs and merges dependencies into the main assembly, so you don't have to load lots of DLL files, and so that they can also be obfuscated.

Dependencies compression and embedding

Compresses and embeds your dependencies into your main assembly, simplifying the deployment of your software and reducing the size of your program.

Method parent obfuscation

Moves methods in your code by changing the class they are in, making it harder to understand how methods and classes relate to each other.

Strong name signing with tamper protection

Signs your assembly and helps to protect it against modification (the additional tamper protection is not available in the Standard edition).

Declarative obfuscation

Excludes a member from obfuscation using custom attributes directly in your code.


SmartAssembly decodes obfuscated stack traces and generates .pdb files containing debugging information. This enables you to debug your assembly into your IDE, and get the full stack trace when an exception occurs. SmartAssembly even helps to ensure that you're automatically releasing unneeded memory.

Integration and Support

Obfuscation can be integrated into build processes using MS Build or command-line, and supports .NET 2.0 to 4.5, and XNA, with some exceptions.

Automated error reporting

Only one thing's worse than finding out your software has bugs: never finding out.

Most users won't bother to report bugs: it's tricky and technically challenging to remember and relate the details. It would be easier for everyone if you let your users just give you the whole story in one quick click, wouldn't it?

Automated Error Reporting is an exception handling mechanism that automatically and silently collects detailed information when errors occur. Although highly customizable, a typical error report consists of a full stack trace and details about the exception context (e.g. values of all the local variables).

There are two main circumstances where Automated Error Reporting is particularly useful:

  1. In the pre-release phase (e.g. beta testing), when you want lots of early user feedback to help you ship a stable application.
  2. In post-release maintenance, when you want to streamline and speed up the process of debugging and fixing your software.

Benefits of Automated Error Reporting

  • Configuring and adding exception handling to your application takes seconds, involves very few changes to your code, yet gives you access to stacks of valuable feedback.
  • No more time-consuming email exchanges to get all the necessary details. Your end-users can report unhandled exceptions at the click of a button, meaning you can fix bugs faster.
  • You get continuous data on which unhandled exceptions are most recurrent, helping you prioritize the bugs which affect the most end-users.
  • You can lower support costs by identifying and fixing the issues your end-users are actually experiencing.

Attach files to your error reports

Using the SDK, you can also package any data you want with the exception report, e.g. a log file or a screenshot taken at the time of the crash. You can even customize your exception handling dialog and ask the user for more information, or contact details so you can contact them when a fix is released.

And if you're using SmartAssembly's obfuscation functionality in your development, we've got you covered – SmartAssembly can decode obfuscated stack traces.

Key features

Range of standard templates

Send error reports with or without prompting the end-user.

Custom templates*
(available from the SDK)

Gives you full control over the dialog box displayed to end-users when an exception occurs.

Report categorization

Categorize reports to quickly see the most common errors your users experience.

Shared exception reports

View the exception reports for applications built by any developer or build system in your organization.

System information always sent

The version of Windows, the .NET version, and a list of loaded assemblies are sent with the stack trace.

Attach files to error reports*

Log files, screenshots, and any other type of file can be attached to error reports.

Collect the end-user's email address

Impress your customers by telling them when the problem has been fixed.


Your error reports are encrypted while stored in the web service and are deleted from the server when you download them.

Web service hosted by Redgate

No complicated installation because Redgate hosts the web service that error reports are sent to.

Custom web service*

Run the web service yourself for maximum flexibility.

Integration and Support

Addition of Automated Error Reporting functionality can be integrated into build processes using MS Build or command-line, and supports .NET 1.1 to 4.0, and XNA, with some exceptions.

Merging DLLs

Compiling .NET code often results in multiple assembly files being created, including satellite DLLs, all of which are required for the program to run. While this is a non-issue during development, when it comes to deployment it often means an unwanted stage of users having to unzip files, or additional steps in the installer as DLLs are moved to specific places.

You can dramatically simplify your deployment process by using SmartAssembly to merge and embed the code from referenced DLLs into your main assembly

Dependency Merging

  • Deploy your .NET application in one file
  • Improve the performance and protection of your software

Dependency merging takes all the DLLs and merges dependencies into the main assembly so you don't have to load lots of DLL files. When a dependency is merged, it becomes a part of the main assembly and the code from a merged dependency can therefore be obfuscated and pruned as well as code from the main assembly.

Dependencies Compression & Embedding

  • Facilitate your software deployment and maintenance
  • Reduce the size of your program

Dependencies compression and embedding allows referenced DLLs to be embedded into the main assembly as resources, instead of being merged into the main assembly's contents. This feature also compresses these resources and dynamically uncompresses them at runtime.

You can control SmartAssembly's dependency merging and dependencies compression and embedding through the command line, so it is easily integrated into the build process, providing simple, reliable merging of dependencies on every build.

The difference between merging and embedding dependencies
The difference between merging and embedding dependencies


How to obfuscate your .NET code using SmartAssembly

A 30 minute demonstration by Chris Allen, Technical Support Engineer for SmartAssembly, followed by a Q&A session:

  • Why you need to obfuscate your code.
  • How to use the standard protection features, i.e. obfuscation, control flow obfuscation, and strings encoding.
  • How to test that the obfuscation has worked.
  • How to take advantage of the more advanced protection features, i.e. pruning, references dynamic proxy, and tamper proofing

Watch fullscreen video

How to deliver high-quality software and exceptional support with automated error reporting

SmartAssembly lead developer Alex Davies demonstrates how to use Automated Error Reporting to automatically gather comprehensive error reports from end-users whenever they hit a bug, and shows how you can use these reports to deliver faster bug fixes. The demo lasts 30 minutes, and is followed by a Q&A session.

  • How to add Automated Error Reporting to your program.
  • How to use error reports to fix bugs.
  • How to customize the error report dialog.
  • How to get log files from your end-user's machine automatically

Watch fullscreen video

Supported technologies and licensing

Supported technologies

SmartAssembly can protect your Winforms and ASP.NET applications and more.

It can also be integrated into build processes using MS Build or the command-line.


SmartAssembly is licensed per machine, meaning per build server or per production machine (any machine you use to produce release builds) and is available in two editions (Standard and Pro).

Priority technical support is available via telephone and email when you buy a Support & Upgrades package for 25% of the product's purchase price.

Learn more about the purchasing options