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

Modification in .net website, Modification in .net website I need some m...

Modification in .net website I need some modification in asp.net website. It's an e-commerce site. Skills required: .NET, HTML, eCommerce, Shopping Carts, Website Design

What are runtime services, What are runtime services? Runtime services ...

What are runtime services? Runtime services having of predefined and user-defined classes that are available to the workflow runtime engine during implementation to customize t

.net remoting, What is .NET Remoting? The .NET remoting is replacement ...

What is .NET Remoting? The .NET remoting is replacement of DCOM. Using .NET remoting you can make remote object calls that lie on different Application Domains. since the remot

Current culture of the environment in windows and asp.net, How we get the c...

How we get the current culture of the environment in windows and ASP.NET? The "CultureInfo.CurrentCulture" represents the current culture of the environment. For illustrate if

What is extensible markup language, What is Extensible Markup Language (XML...

What is Extensible Markup Language (XML). XML is an easy and flexible mark-up language in the text format. Nowadays, it is widely used to exchange a large variety of data over

Durkheims theory of crime, Application of durkheim''s theory of crime in ex...

Application of durkheim''s theory of crime in explaining the crime context in south Africa. Highlighting the relevance of the theory, as well as its limitations

Classic ado and ado.net , What are major difference between classic ADO and...

What are major difference between classic ADO and ADO.NET ? Some major differences between the classic ADO & ADO.NET are as follows: 1) As in the classic ADO we had server a

ASP.Net MVC, how can we use entity framework in ASP.Net MVC

how can we use entity framework in ASP.Net MVC

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