Types of compatibility in vb6, DOT NET Programming

Assignment Help:

What are types of compatibility in VB6

There are three possible project compatibility settings:

  • No Compatibility
  • Project Compatibility
  • Binary Compatibility

1) No Compatibility: With this Compatibility setting, new interface ID's, new class ID's,  and a new type library ID will be generated by VB every  time the ActiveX component project is compiled. This will cause any of the compiled client components to fail (with error 429!) and report a missing reference to the 'VB ActiveX Test Component whenever a client project is loaded in the VB IDE.

2) Project Compatibility: With this Compatibility setting, VB will generate a new interface ID's for classes whose interfaces have changed, but will not change the class ID's or the type library ID. This will still cause any of the compiled client components to fail (with error 429!) but will not report a missing reference to the 'VB ActiveX Test Component' whenever  a client project is loaded in the VB IDE. Recompilation of the client components will restore them to the working order again.

3) Binary Compatibility: The VB makes it possible to extend an existing class or interface by adding new methods & properties etc. and yet still remain binary compatibility. It can do this, as it silently creates a new interface ID for the extended interface and adds registration code to register the original interface ID but with a new forward key having the value of this new interface ID. COM will then substitute calls having the old ID with the new ID and so applications built against the old interface will continue to work (assuming the inner workings of the component remain backward compatible!). With that setting, VB will not change any of the existing class, interface or type library ID's, however in order that it can do so, VB requires the project to specify an existing compiled version that it can compare against to assure  that the existing interfaces have not been broken.


Related Discussions:- Types of compatibility in vb6

What is common language specification, What is Common Language Specificatio...

What is Common Language Specification (CLS)? CLS is a set of essential rules, which must be followed by each .NET language to be a .NET- compliant language. It enables interope

Project, Sir can you suggest me a project that I am do that i present in la...

Sir can you suggest me a project that I am do that i present in last year project work

Thread.sleep(), What is Thread.Sleep() The Thread's execution can be pa...

What is Thread.Sleep() The Thread's execution can be paused by calling Thread.Sleep method. This Thread.Sleep() method takes an integer value which  determines how long the thr

App to evaluate if a street address fits within a specified, Project Descri...

Project Description: Take a CSV of Canadian street addresses. For every address, translate the address into a GPS coordinate. Use the GPS coordinate to test whether or not the a

Explain hybrid and community cloud, Explain hybrid and community cloud. ...

Explain hybrid and community cloud. The hybrid cloud having of multiple service providers. This model integrates several cloud services for Hybrid Web hosting. It is basically

Benefits and limitations of using cookies, What are benefits and limitation...

What are benefits and limitations of using Cookies? The benefits of using cookies for state management are as follows:- 1)    There is no server resources required as they a

Comparison of asp.net session with classic asp session, What are ASP.NET se...

What are ASP.NET session and compare it with classic ASP session The ASP.NET session caches per user session state. It basically uses "HttpSessionState" class. The limitatio

Jquery and mvc 4.5 training session, I am looking individuals who have indu...

I am looking individuals who have industry experience working on Microsoft Technology and Jquery ( MVC 4.5 ), who will take live online session and give training through Team Viewe

Learning management system, I am looking for learning management software (...

I am looking for learning management software (LMS) preferably in ASP.NET and Microsoft SQL/ MYSQL server as the database. The broad scope of the system could be 1. User managem

Read an array and perform sorting - c# program, Read an Array and perform S...

Read an Array and perform Sorting - C# program Can any one assist me in performing sorting of an array.

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd