I am using VS 2010 Ultimate i got this error

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SQL-server-2000

SQL-Server-2005

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Server Error in '/RetriveData' Application.
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Could not load file or assembly 'firebirdsql.data.firebirdclient' or one of its dependencies. This assembly is built by a runtime newer than the currently loaded runtime and cannot be loaded.

Posted 30-Jan-12 6:18am

2011999

Updated 30-Jan-12 7:20am

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ZurdoDev 30-Jan-12 12:25pm

What exactly is your question? Your site is not loading a dll because the runtime is newer than what you are running. For example, your firebirdclient was built for .Net 4.0 but you are running in .net 2.0. Something along those lines is what is causing your issue.

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Manfred Rudolf Bihy · Answer 1 · 2012-01-30T06:27:00

The error message contains all the information you need:

"...This assembly is built by a runtime newer than the currently loaded runtime and cannot be loaded..."

This essentially says that you are targeting a .NET version in your project that is less than the the .NET version the Firebird assemblies where targeted for.

Example 1: Your project is .NET 2.0 and the Firebird assembly was compiled with .NET 4.0
Result 1: Will not work.

Example 2: Your project is .NET 4.0 and the Firebird assembly was compiled with .NET 2.0
Result 1: Will work.

In short: You can't use a higher .NET version assembly from a lower .NET version project, but the other way it is permissible.

Regards,

Manfred