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HealthMEDX used gmStudio in support of its project to upgrade its Vision product to ASP.NET/VB.NET. A large ASP/VB6/COM legacy application, this system consists of over 2,000 ASP pages, totaling over 1 Million lines of unique ASP code (LOC), plus a collection of 70 interrelated VB6/COM components totaling about 700,000 unique VB6 LOC.

In a nine-month effort (a three-month Proof of Concept followed by a six month implementation) Great Migrations assisted HealthMEDX in rewriting Vision to VB.NET and in reengineering it for the .NET Framework. Using gmStudio, we designed and built a migration solution that automates the rewriting of the entire application (both VB6 and ASP parts) as reengineered VB.NET code. Some of the technical highlights of this solution are as follows:

  • Rewrite the site ASPX pages with VB.NET code-behind which is organized in a large .NET web application project
  • Rewrite 400 #include files into web user controls with code-behind, as appropriate
  • Replace COM references with .NET components, including replacing ADODB-based data access calls with calls to a custom ADO.NET-based data access framework developed by HealthMEDX
  • Rework Win32 dependencies to use .NET framework classes
  • Rewrite 250K LOC of client-side VBScript as client-side Javascript
  • Rework BAS modules in the VB6 DLLs to be compatible with ASP.NET state conventions
  • Rework VB6 code file sharing to use file linking in .NET
  • Rewrite entire .NET site, including all of the re-engineering work outlined above, with gmStudio in under 15 minutes.  This quick turn around made it possible to apply the solution to a changing codebase and to iteratively implement corrections and to experiment with many design changes and optimizations throughout the course of the project.

 

 

HealthMEDX
5100 N. Towne Centre Drive
Ozark MO 65721