Many of today’s applications that were developed in COBOL are still mission-critical and continue to deliver significant benefits to the organizations that use and rely upon them. Nevertheless, many organizations are faced with issues of Total Cost of Ownership (TCO), skill shortage, or simply end of support of the technology that served them well for many decades. Anubex’ service provides an opportunity to liberate these valuable and reliable business systems from their dependency on compiler technology that is no longer wanted, and convert them to Object-Oriented languages such as C# (C sharp) or Java.


Anubex will take any application developed in COBOL and automatically convert it C#. The application will remain a functionally identical one, now ready to run on Windows and .NET.

Since both the COBOL to C# conversion and the testing is fully automated, the outcome of the project is fully predictable, in terms of risks, costs, and duration!

The migrated application is completely free of dependencies on Anubex software and relies on industry standard technologies instead.

Three Strong Promises

All COBOL to C# migrations performed by Anubex ensure three types of equivalence:

Functional equivalence: the converted C# application’s behavior is identical to that of the original COBOL one;

Performance equivalence: the converted C# application will perform at least as well as the original COBOL one (of course, assuming adequate infrastructure); and

Maintenance equivalence: maintenance of the converted application will be - after proper training provided by Anubex - comparable in effort to the original COBOL application.

Why convert your COBOL to C#?

COBOL has been declared dead more than once the past decades, yet the number of COBOL lines of code in use is still growing year-by-year.

There are however many good reasons to contemplate a migration from COBOL to C# (C sharp). These are typically the major concerns for businesses:

  • High (and rising) maintenance and runtime fees for the existing COBOL products;
  • Shrinking availability of COBOL developers and lack of interest in COBOL from young developers;
  • The End-of-life scenarios for certain COBOL technologies;
  • Lack of application extensibility and interoperability with other, non-COBOL applications.

Converting from COBOL to C# and the .NET platform offer answers to all these concerns:

  • Support fees are negligible or even non-existing;
  • C# is one of the most widely-used programming languages today and actively being developed;
  • The .NET platform is constantly extending as well becoming available on more operating systems and devices.

Next to that, a COBOL to C# transformation also means:

  • Enabling the use of a state-of-the-art IDE, with extensive debugging, refactoring, profiling and (unit)testing support.
  • Enabling the use of thousands of third-party libraries, covering almost all imaginable computing needs.
CodeTurn for COBOL to C# Conversion

Anubex uses its own specialized tools to automate the migration of COBOL sources to C#, guaranteeing code quality, avoiding risks, and offering full predictability through 100% automation.

The architecture of the COBOL to C# converter contains:

  • A parser that support many COBOL dialect syntax, and embedded languages (e.g. EXEC CICS or EXEC SQL);
  • A resolver that computes detailed control-flow and data-usage information;
  • Conversion rules for all COBOL syntax, from single statements to complex patterns of code; and
  • A code generator for C# enabling any desired coding style.
Key Traits of Anubex’ COBOL to C# conversion tool
  • Handles all COBOL data types with 100% fidelity
  • Handles also complex GO TO and PERFORM/fallthrough based control-flow
  • Favors simple mappings when possible while having fallback mappings when needed (E.g. PERFORM will be a method invocation if possible but also RM/COBOL style PERFORMS can be mapped)
  • Has clean mappings for most COPY and many COPY…REPLACING directives
  • Resulting code takes maximal advantage of modern IDEs refactoring possibilities so further changes can be done in an incremental and type-safe way
  • Resulting code can be configured to be more OO-style or more procedural style
  • Offers many out-of-the-box customization possibilities (e.g. removing dead code, removing unused variables, naming and grouping of data)
  • A plugin-based architecture making it easy to create project-specific conversion rules
  • Enables modernization of UI (e.g. using web-based or WP UI) and data storage (using any RDBMS instead of ISAM/VSAM)
  • Built to take advantage of massive parallelization resulting in even the biggest source code sets (with tens of millions of LOC) being converted in a matter of hours


Anubex has a 100% success rate, having completed numerous COBOL to C# migration and modernization projects around the globe.

Each of these projects has been delivered on time, within budget and to the complete satisfaction of the customer.

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