VB6/ASP/COM to .NET Customers

Structural Engineering Applications – VB6 to C#/WPF


Great Migrations developed a VB6/COM to WPF C#/.NET solution to upgrade a suite of 2 desktop applications. The structure of the source codebase was 185,986 Total LOC 140,354 Logic LOC 22,171 GUI LOC organized into two VBPs. The duration of the project was four months.

Upgrade Features

VB6 Forms to WPF

  • Implemented a new coding standard (subsystem=”wpf”) that includes the rules to rewrite VB6 forms as WPF.XAML forms. The WPF subsystem includes rules for project files, designer code, event handlers, and other UI-centric logic.
  • Implemented upgrade rules for all the most popular VB6 intrinsic controls.
  • Implemented upgrade rules for tab control (TabDlg).
  • The VB6 to WPF implementation is implemented in the configuration files and gmSL scripts so it may be extended and modified by the user.

COM/VB6 to .NET replacements

  • FileSystem: Migrated to an updated version of Microsofts VB6 File System Replacement
  • Printing to WPF Printer
  • Record Based FileIO Support
  • VB6 Surface Graphics to WPF Graphics library (Including Redraw functionality)
  • Extracted VB6 FRX data as png files for XAML
  • GoSubs to function calls

Extension Methods

The upgrade solution used our Lightweight Object-Oriented C# coding standard that uses various extension methods to more accurately emulate VB6 semantics.


Insurance Application Suite


Great Migrations developed a VB6/COM to functionally correct C#/.NET solution to upgrade a suite of three enterprise desktop applications. The structure of the source codebase was
187K LOC Logic 89K LOC GUI in 327 Files: 259 Forms, 2 MDIForm, 35 Classes, and 16 Modules organized into 15 VBPs. The duration of the project was 12 months.

Upgrade Features

COM to .NET replacements:

  • MSHierarchicalFlexGridLib: upgraded to MigrationSupport.UI.Grid (a Grid control derived from WinForms.DataGridView and delivered as C# source)
  • ADODB: upgraded to MigrationSupport.DataLib (an ADODB emulation based on System.Data and delivered as C# source)
  • CDO: upgraded to System.Net.Mail
  • Excel: upgraded to Microsoft.Office.Interop.Excel
  • Ieframe: upgraded to WinForms.WebBrowser
  • MSACAL: upgraded to System.Windows.Forms.MonthCalendar
  • MSComCtlLib: upgraded to System.Windows.Forms controls (StatusBar, ListView, TabStrip, ProgressBar, ImageList)
  • MSComCtl2: upgraded DTPicker, MonthView, UpdownControl to Winforms Controls (DateTimePicker, MonthCalender, NumericUpDown)
  • MSFlexGridLib: upgraded to MigrationSupport.UI.Grid using MSHFlxGrid rules
  • MSMask: upgraded MaskEdBox to WinForms.MaskedTextBox
  • TabDlg: upgraded to MigrationSupport.UI.TabControl (a TabDlg emulation delivered as C# source)
  • RichTextLib: upgraded to RichTextBox to WinForms RichTextBox
  • Scrrun: upgraded to System.IO
  • ShdocVw: upgraded Migrate ShDocvwCtl.WebBrowser to WinForms.WebBrowser
  • Word: upgraded to Microsoft.Office.Interop.Word
  • In-house .NET: upgraded to use .NET directly instead of Interop

Trace Logging

The upgrade solution used out Trace Logging feature. This feature instruments the VB6 code such that a record to a log file is written whenever execution enters or exits a method. Translating the instrumented VB6 code produces an instrumented .NET code as well. This technique, along with careful side-by-side testing, helps us analyze behind-the-scenes differences between the VB6 and .NET code.

Extension Methods

The upgrade solution used our Lightweight Object-Oriented C# coding standard that uses various extension methods to more accurately emulate VB6 semantics.

Trace Logging

The upgrade solution used out Trace Logging feature. This feature instruments the VB6 code such that a record to a log file is written whenever execution enters or exits a method. Translating the instrumented VB6 code produces an instrumented .NET code as well. This technique, along with careful side-by-side testing, helps us analyze behind-the-scenes differences between the VB6 and .NET code.

BMW Financial Services of North America — Desktop Applications Portfolio

BMWFS used gmBasic (actually, a custom version of it, promulaBasic) to migrate several hundred application components from VB6 to C#. The gmBasic tool was customized to perform significant restructuring of the VB6 code to conform to BMWFS’s unique architecture standards, such as the following:

  • ADO to ADO.Net
  • MS Flexgrid to Xceed Grid
  • VB6 Error Handling to try-catch
  • VB6 Collection classes to client, custom collection classes
  • MSXML to System.XML
  • Windows Scripting Library to System.IO
  • Legacy Appliation Frameworks to new .NET Application Frameworks
  • VB6 ActiveX controls to FS-standardized .NET Windows Forms Classes

BMW Financial Services of North America
5550 Britton Parkway
Hilliard, OH 43026

ADP Dealer Services Desking System

ADP Dealer Services used gmStudio in support of its project to upgrade its Desking product to ASP.NET/C#.NET. Desking is a commercial web application consisting of over 200 ASP pages and 60 #include files containing over 125K server-side logicLOC and 30K markupLOC. Desking also includes a custom VB6 business logic DLL containing about 40K LOC.

In a two week engagement, Great Migrations developed a custom migration solution to automatically rewrite the VB6/ASP Desking application code as C# ofbuild-completequality. Some of the technical highlights of this solution are as follows:

  • Rewrites the site’s 200+ pages as ASPX pages with C# code-behind organized in a .NET web application project
  • Rewrites the site’s 60+ #include files as web user controls with code-behind, as appropriate
  • Replaces COM references with generated .NET stub classes.
  • Reworks Win32 dependencies to use .NET framework classes
  • Reworks VBScript to C# with strong typing
  • Produces detailed system metrics reports to assist with planning the work to refactor and optimize the code by hand
  • Translation Time: VB6 5 seconds, ASP Site: 20 seconds

ADP Dealer Services
2 Huntington Quadrangle, Melville NY 11747

HealthMEDX — Long-term Care and Home Health Solutions

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.

5100 N. Towne Centre Drive
Ozark MO 65721

ROBUST Systems Inc. — Land Record Management System (ILMS)

ILMS is a UI-heavy commercial application used by several cities and counties for land record management purposes. Using gmStudio, this hybrid VB6/COM/ASP application was upgraded to the C#.NET/ASP.NET platform by replacing all COM controls and APIs with .NET equivalents. The web server infrastructure was redesigned and migrated from ASP to ASP.NET. A winsock-based communication infrastructure was reworked to use .NET sockets and multi-threading classes.

ROBUST Systems Inc.
1305 FM 359 Rd., Suite C
Richmond, TX 77469-2024

CAVU Corporation

CAVU Corporation develops and sells complete enterprise solutions that support all the business automation requirements of governmental regulatory and revenue agencies. Their product is a large web based system of over 1,000 web pages referencing over 1M LOC. CAVU is using gmStudio to translate and reengineer their products for ASP.NET/C#.

4515 Falls of Neuse Road Suite 250
Raleigh, NC 27609-6375

Chevin Fleet Solutions

Chevin Fleet Solutions develops and sells a comprehensive vehicle fleet management solution that allows organizations to improve the efficiency and visibility of their fleet operation by delivering key performance fleet operating information direct to the desktop on demand. Their product is a large web based system of over 500 hundred web pages referencing over 500K LOC. Chevin is using gmStudio to translate and reengineer their product for ASP.NET/C#.

East Mill, Bridgefoot, Belper
Derbyshire, DE56 2UA, United Kingdom

Insurance Auto Auctions

IAA has an extensive VB6/ASP application that is composed of a large server-side object model (125 VB6/COM DLLs containing 250K LOC) and an IIS web site (500+ ASP pages containing 240K LOC). They are using gmStudio to help implement an ambitious migration to C# with extensive reengineering.

Insurance Auto Auctions
Two Westbrook Corporate Center, Suite 500
Westchester, IL 60154

ISO New England — Analytical Applications

ISO New England used gmStudio to upgrade two applications to .NET:

  • CCA, Claimed Capability Audits: This VB6 application was rewritten and upgraded to C#.NET with gmStudio. As part of this upgrade, two different data access APIs (ADO and DAO) and four different types of Grid Controls (FlexGrid, Hierarchical FlexGrid, MSDataGrid, as well as the internal Data Control) were standardized to ADO.NET and the .NET Forms library.
  • OIS, Operator Information System: This hybrid VB6/ASP/COM application was rewritten and upgraded to C#.NET/ASP.NET with gmStudio. The application included a very complex UserControl that wrapped and dynamically configured a control-array of FarPoint Spread controls. This rather complex ASP/VB6 solution was reengineered to a standard C#/.NET architecture including migrating to the .NET version of FarPoint Spread.

ISO New England, Inc.
One Sullivan Road
Holyoke, MA 01040


RetailerSoft develops and sells Margin Master, a sophisticated desktop application that allows retailers to optimize pricing strategies to boost profits. Margin Master was a single VBP referencing 150K LOC and about two dozen third party COM libraries and controls. RetailerSoft used gmStudio to produce a build-complete C# translation of the Margin Master code with .NET class stubs for all COM dependencies. The translations provided a big head start in their efforts to refactor the code and move application functionality into a new design.

1770 Winter Street
West Branch, MI 48661


Sidney Worth offers a powerful day-trading methodology that is supported by a sophisticated suite of software tools. The development team at SidneyWorth.com used gmStudio internally to upgrade these tools to reengineered C#. The migration included upgrading several COM controls/APIs to .NET replacements:

  • Chilkat Ftp2
  • /n software inc. – IPWorks! SSL V8 HTTPS Control
  • Chilkat XML 5.0.0
  • Microsoft Windows Common Controls (ImageCombo)
  • Microsoft Windows Common Controls-2 (DTPicker)
  • Microsoft Common Dialog Control


Xornet Inc. — Website Integration

Using gmStudio, Xornet upgraded its ASP website integration component (WidgetPop Adapter) for use on the ASP.NET/C#.NET and ASP.NET/VB.NET platforms.

Xornet Inc.

3800 Dewey Ave #141
Rochester, NY 14616

FORTRAN to C Customers

AT&T — Image Processing Applications

1600 Osgood Street
North Andover, MA 01845

AT&T Bell Labs
555 Union Blvd., MLS 3B-273
Allentown, PA 18103-11285

Atlantis Aerospace Corporation

1 Kenview Blvd.
Brampton, ON L6T 5E5

Banco Mapfre Informatica

Ctra. Pozuelo Majadahonda KM 3.800
38220 Majadahonda

Bonneville Power Administration

The Rate Analysis Department used the Promula Application Development System, the Promula FORTRAN to C Compiler and the Promula IMPACT Compiler (a special processor for the IMPACT financial modeling language) to migrate its Rate Analysis Model from an IBM mainframe to the OS/2 desktop platform.
905 NE 11th Ave.
Portland, OR 97232

BPX — Oil Exploration Data Analysis

British Petroleum and Exploration used Promula FORTRAN to port its FORTRAN-based applications from VAX and Cray mainframe computers to UNIX workstations, such as the IBM RS/6000, the SUNSPARC station, and the Silicon Graphics IRIS system.

BP Exploration (Alaska)
Anchorage, AK 99508

BP Exploration (Glasgow)
900 East Benson Blvd. Glasgow, UK
BP Exploration (Aberdeen)

CAE Electronics Ltd

8585 Cote de Liesse
St. Laurent, Quebeck H4T 1G6

Caterpillar Inc

1311 E. Cedar Hills Dr., Rm 176-TC-A
Mossville, IL 61552

Chevron — Oil Exploration Data Analysis

The Chevron Exploration and Production Services Company of Houston, TX, used Promula FORTRAN to convert all of its exploration data management and analysis software from VAX/VMS FORTRAN to VAX/VMSC and SUN UNIX.
Chevron Exploration and Production Services Company
2811 Hayes Road
Houston, TX 77082

Cimatron Ltd. — CAD/CAM Software

Cimatron used Promula FORTRAN to bring its CAD/CAM software package to open systems, via translation to C, and to its clients around the world.
Cimatron Ltd.
11 Gush Etzion St.
Givat Shmuel 51905

CMG Den Haag B.V

Divisie Advanced Technology
Lange Voorhout 3
Den Haag 2501 CD
Holland, The Netherlands

Computer Sciences Corporation

Remittance Processing System

CSC is using the Promula FORTRAN software in the migration of its Remittance Processing System from a FLEX FORTRAN dialect, on a Data General platform, to a Windows NT platform via automatic translation to C and application rehosting.

Computer Sciences Corporation
Financial Services Group
300 Lakeside Drive
Oakland, California 94612

Cullimore and Ring Technologies, Inc

5426 Morning Glory Lane
Littleton, CO 80123

Dellab — Laboratory MIS

Dellab, a provider of laboratory information management software for the chemical industry, uses Promula FORTRAN to port its FORTRAN-based software from the DEC PDP platform to the 386 Interactive UNIX platform.

Dellab Service Associates, Inc.
2625 Tanager Drive
Wilmington, DE 19808

Department of Defense Software Conversions

Promula FORTRAN is in use at various DOD and Department of Commerce sites to assist in the conversion of FORTRAN-based applications to C.

Naval Research Laboratory

Code 8340
4555 Overlook Ave. SW
Washington, DC 20375-5000

9800 Savage Rd.
Ft. Meade, MD 20755

Department of Commerce Software Conversions

U.S. Dept. of Commerce NOAA NOS
11400 Rockville Pike, #427A
Rockville, MD 20852

ESRI — GIS Applications

ESRI — a leading provider of commercial geographical information systems (GIS) — used Promula FORTRAN to deliver and support its GIS software on a number of platforms: PC-DOS, PC-Windows, SUN Microsystems, and the Apple Macintosh.

1895 E. County Road E
St. Paul, MN 55110

GIS Technology Transfer

5501 Longboat Blvd.
Tampa, FL 66315

Gratham Mayo — Financial Analysis

This financial services firm used PROMULA.FORTRAN to migrate its FORTRAN applications to C for use on UNIX workstations.

Grantham Mayo
40 Rowes Wharf
Boston, MA 02110

Grey Matter, Ltd

Grey Matter, Ltd., is our reseller in the United Kingdom and has provided Promula FORTRAN to several clients in Europe.

Grey Matter Ltd.
Prigg Meadow
TQ13 7DF

Grumman Melbourne Systems — Military Simulation Application

Grumman Melbourne Systems
330 Albacore Place
Melbourne Beach, FL 32951

Insight, Inc

38 Linda Vista Place
Monterey, CA 93940

Institute of Paper Science & Technology

500 10th Street NW
Atlanta, GA 30318

KIWI — Paper Packaging MIS

KIWI used Promula FORTRAN as its multi-platform FORTRAN compiler to deliver and support KIWIPLAN on a number of C-based platforms:

  • Data General AOS/VS
  • Data General Aviion (UNIX)
  • Hewlett Packard MPE/XL
  • Hewlett Packard UX (UNIX)
  • i386/i486 UNIX
  • IBM RS/6000 AIX (UNIX)

KIWIPLAN is a manufacturing control and information management system marketed by KIWI Packaging Ltd. to paper packaging companies worldwide.

KIWI Packaging Ltd.
Nesdale Avenue, Wiri
Auckland, New Zealand
KIWIPLAN, Cincinatti

Kohler Ingenierburo

This consulting group has used Promula FORTRAN in several conversion projects in Germany.

Kohler Ingenierburo
An den Postwiesen 13
6 0488 Frankfurt/Main, Germany

Martin Marietta — FORTRAN to Ada Conversion

Martin Marietta used our FORTRAN to Ada Translator to convert its VAX FORTRAN simulation applications to the Ada language for use on the DEC Alpha OSF/1 platform.

Martin Marietta
12506 Lake Underhill Rd.
Orlando, FL 32825

Management and Data Systems
Bldg 12, 935 First Ave
King of Prussia, PA 19405

MCI Network Services — Network Services Billing System

MCI (now Verizon) used the Promula Fortran translation software to rehost three legacy applications:

  • Network Services Billing
  • Network Order Entry System
  • Phone Access Database
from a legacy source platform:

  • DEC 36-bit mainframe hardware
  • TOPS/ICS operating system
  • XF4 FORTRAN/KCC C code base
  • System1022 database
to a contemporary target platform:

  • IBM RS6000 hardware
  • AIX operating system
  • ANSI C code base
  • ORACLE database
 MCI Network Services
5000 Britton Road
Hilliard, Ohio 43026

To achieve the objectives of this project, Promula developed a number of migration tools:

  • PXF4, an XF4 FORTRAN-to-C Translator
  • PICS, an emulation of the ICS command line interpreter for UNIX
  • PL1022, an emulation of the System 1022 database language (and its FORTRAN and C call interfaces) for UNIX and ORACLE SQL
  • XF4LIB, a library of XF4 FORTRAN functions for UNIX
  • AIXLIB, a library of DEC TOPS operating system functions for AIX
  • KCCTRANS, a KCC-to-ANSI C translation tool
  • FILGE, a DEC text editor for UNIX

MIT Lincoln Laboratory

224 Wood St.
Lexington, MA 02173

Mnemonics, Inc

616 E. Charles St., Suite 202
La Plata, MD 20646

MTS Systems

14000 Technology Drive
Eden Prairie, MN 55344

National Weather Service

222 W. 7th Ave., #23
Anchorage, AK 99513-7575

Nemetschek AG, Muenchen, Germany — Commercial CAD Applications

Nemetschek applied the Promula FORTRAN to C Translator to port its commercial CAD applications to multiple platforms (Windows NT, Unix) via translation to C.

Nemetschek AG
Riedenburger Straße 2
D-81677 Muechen, Germany

New York City Transfer Authority — Transportation Scheduling Applications

The NYCTA used the Promula FORTRAN to C Translator to port its transportation scheduling applications from the PRIME platform to the HP 9000/UX platform.

New York City Transit Authority
130 Livingston Street
Brooklyn, New York 11201

Northern Trust Company — Financial Services Applications

Fifty LaSalle Street
Chicago, IL 60675

O’Brien Consulting

10419 N. Applewood Court
Mequon, WI 53092

Procter & Gamble — Financial Analysis Applications

Procter & Gamble Co.
Ivorydale Tech Center
5299 Spring Grove Ave.
Cincinatti, OH 45217

Profitool — Construction MIS

Profitool used the Promula FORTRAN to C Translator to port its CMIS (Construction Management Information System) software from the PRIME platform to a number of open UNIX platforms, including the IBM RS6000 and the HP-UX workstations, and deliver it to construction firms worldwide

Profitool, Inc.
1600 Stout St., Suite 2000
Denver, CO 80202

PSI International, Inc

810 Gleneagles Ct., Suite 300
Towson, MD 21286

Quinton Instrument Company

2121 Terry Ave.
Seattle, WA 98121-2791

Raytheon Company, Submarine Signal Division

1847 West Main Road
Portsmouth, RI 02871-1087


825 NE Multnomah
Portland, OR 97232

Rincon Research Corporation

101 N. Wilmot, Ste 310
Tucson, AZ 85711

SABCO — Pharmacy MIS

SABCO, a supplier of medical computer systems in Europe, used Promula FORTRAN to port its pharmacy MIS application from a DEC PDP platform to a PC, C-based platform.

6 Rte D’Ettelbruck
Colmar-Berg L 7715

Salomon — Financial Analysis

Salomon Technology Services used Promula FORTRAN to port its FORTRAN-based analytical applications from the PRIME/PRIMOS platform to the SUN/UNIX platform.

Salomon Technology Services, Inc.
745 Route 3, 4th Floor, Dept. 5D4
Rutherford, NJ 07070

Sandia National Labs

1515 Eubank SE
Albuquerque, NM 87185-1179

Scientific Computer Applications Inc

601 S. Boulder Ave., Ste 810
Tulsa, OK 74119-1328

Sky Computers, Inc. — FORTRAN 77 Compiler for the SKYstation

Sky Computers used Promula FORTRAN under the name SKYVEC77 as a FORTRAN compiler for its SKYstation computer (an i860-based, 64-bit accelerator board for SUN Microsystems computers).

Sky Computers, Inc.
27 Industrial Drive
Chelmsford, MA 01824

Southwest Power Pool — Electric Utility Applications

Southwest Power Pool
Plaza West Building, #700
415 N. McKinley @ Lee
Little Rock, AR 72205-3020

SUMMIT Information Systems, A FISERV Company — Financial Applications

SUMMIT used the Promula FORTRAN to C Translator to port its Credit Union Management System, SPECTRUM, from FORTRAN to C on the HP 3000 MPE/iX platform.

SUMMIT Information Systems
4500 SW Research Way, P.O.Box 3003
Corvallis, OR 97339-3003

Sverdrup Technology Inc., TLMRC Division

100 Research Drive
PO Box 208
Haslet, TX 76052

Systems & Software Group

3977 Research Park Drive
Ann Arbor, MI 48108

Teradyne — Computer Hardware Testing

Teradyne used Promula FORTRAN to convert to C its VAX/VMS FORTRAN-based computer-hardware-testing commercial applications.

Teradyne, Inc.
321 Harrison Ave.
Boston, MA 02118

TRW — Department of Defense

Using PROMULA.FORTRAN, TRW was able to convert to C on a SUN Microsystems platform a mission-critical FORTRAN application for their Department of Defense clients.

293 Highway 247 South
Warner Robins, GA 31088

United Airlines — UNIMATIC Modernization Project

UAL used the Promula FORTRAN software to convert some of its flight scheduling and operations applications from an ‘old’ Fieldata FORTRAN-based platform, on a UNISYS mainframe, to a contemporary C-based platform via automatic FORTRAN-to-C translation and data restructuring.

United Airlines
1200 Algonquin Rd.
Elk Grove Township, Illinois 60007

University Engineering Applications

The Department of Aeronautical Engineering of the Texas A & M University uses Promula FORTRAN to convert its CAD applications to C and UNIX platforms.

Texas A & M University
701 H.R. Bright Bldg.
College Station, TX 77843-3141

The Department of Electrical Engineering of the University of Waterloo, Ontario, used Promula FORTRAN to convert its engineering applications to C.

Dept. of Electrical Engineering
University of Waterloo
Waterloo, ON N2L 3G1

The University of Oklahoma used Promula FORTRAN to convert a number of its FORTRAN-based Computer Science applications to C.

University of Oklahoma
Tulsa, OK

The Anderson Cancer Center of the University of Texas used Promula FORTRAN to convert to C a library of biostatistical functions.

Department of Biomathematics, Box 237
University of Texas M. D. Anderson Cancer Center
1515 Holcombe Blvd
Houston, TX 77030

gmADS Modeling and Simulations Developers

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Central Maine Power Co.

83 Edison Drive
Augusta, ME 04336


NEPLAN: New England Power Planning
One Sullivan Road
P.O. Box 1310
Holyoke, MA 01041-1310

Sandia National Laboratories

Computation, Computers, Information and Mathematics Center
Sandia National Laboratories
P.O. Box 5800-0370
Albuquerque, NM 87185-0196
Bus: 505-284-5787

State of Utah

Governor’s Office of Planning and Budget
116 State Capitol
Salt Like City, Utah 84114

Systematic Solutions, Inc

1519 Heatherwood Trail
Xenia, Ohio 45385
(937) 429-4010
(937) 620-2029