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What is Project Compatibility in VB6?

Posted By :Ghanashyam Nayak     Posted Date :January 03, 2011    Points :15   Category :VB.Net 
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.

You can also find related Interview Question to What is Project Compatibility in VB6?  below: 

Can I easily rename a solution or project?

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

  
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What are types of compatibility in VB6?

  
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What is No Compatibility in VB6?

  
With this setting, new class ID's, new interface ID's and a new type library ID will be generated by
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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!).
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