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What is No Compatibility in VB6?

Posted By :Ghanashyam Nayak     Posted Date :January 03, 2011    Points :15   Category :VB.Net 
With this setting, new class ID's, new interface ID's and a new type library ID will be generated by
VB each time the ActiveX component project is compiled. This will cause any compiled client
components to fail (with error 429!) and report a missing reference to the 'VB ActiveX Test
Component' when a client project is loaded in the VB IDE.

You can also find related Interview Question to What is No Compatibility in VB6?  below: 

How will you set the compatibility level for your Sql Server Database?

  
we can set the compatibility level using the below command

for Sql Server 2000:

EXEC sp_dbcmptlevel databasename, 80;

for Sql Server 2005:

EXEC sp_dbcmptlevel databasename, 90;

for Sql Server 2008:

EXEC sp_dbcmptlevel databasename, 100; (More...)

What are types of compatibility in VB6?

  
There are three possible project compatibility settings:
? No Compatibility
? Project Compatibility
? Binary Compatibility (More...)

What is Project Compatibility in VB6?

  
With this setting, VB will generate 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 compiled client
components to fail (with error 429!) but will not report a missing reference to the 'VB ActiveX
Test Component' when a client project is loaded in the VB IDE. Recompilation of client
components will restore them to working order again. (More...)

What is Binary Compatibility in VB6?

  
VB makes it possible to extend an existing class or interface by adding new methods and properties
etc. and yet still retain binary compatibility. It can do this, because 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 containing the value of this new interface ID. COM will then substitute
calls having the old ID with the new ID and hence applications built against the old interface will
continue to work (assuming the inner workings of the component remain backward compatible!).
With this 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 ensure that existing interfaces have not been broken. (More...)

How can we remove compatibility view setting (which is default for intranet websites) through code.

  
You can simply do it using the below code. Just write down the code in head section of the aspx page.

(More...)

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