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

Unhandled exception occurred during the execution, Project Description: ...

Project Description: I have a site that's previously fully developed, and need to fix some small problems (Text editor posting error, and a Server error caused by some Nhibernat

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

Fish bone diagram, What is a fish bone diagram? Dr. Kaoru Ishikawa disc...

What is a fish bone diagram? Dr. Kaoru Ishikawa discovered the fishbone diagram. Therefore, it can be also known as Ishikawa diagram. The Fishbone diagram is an analysis dia

Develop a mlm business, Advertizing Project Description: I am prepari...

Advertizing Project Description: I am preparing a MLM business. I can need direct mailing and coupon books as a product in my website. Skills required are .NET, C# Program

Web based program prepared with net c# and sql server, Project Description:...

Project Description: We have a web based program prepared with .NET C# and Microsoft SQL Server. There are some reports needs to be created. Required Skills. - High Pro

Ado.net architecture, Can you give an overview of ADO.NET architecture? ...

Can you give an overview of ADO.NET architecture? The most important part  in the ADO.NET architecture is the "Data Provider". The  Data Provider provides access to the datasou

Configure webgarden, How do we configure "WebGarden"? The process model...

How do we configure "WebGarden"? The process model configured the "Web garden" settings in the "machine.config" or in the "Web.config" file. The configuration section is named

Windows 8.1 project - asset management slate app, I need Windows 8.1 Projec...

I need Windows 8.1 Project, Asset management slate App Project Description: We are seeking a Windows 8 app developer with PROVABLE experience to prepare a project and asset m

Ways to implement locking in ado.net, What are the ways to implement lockin...

What are the ways to implement locking in ADO.NET? There are many ways to implement locking using ADO.NET which are shown below:- 1)Whenever we call "Update" method of DataA

What is the datacontext class, What is the DataContext class and how is it ...

What is the DataContext class and how is it related to LINQ? After you add a LINQ to SQL Classes item to a project and open the O/R Designer, the empty design surface shows an

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