Installation de DDEXprovider Firebird.net
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Voir aussi
http://blog.vyvojar.cz/jirka/archive/2006/02/19/7471.aspx
et
http://www.firebirdsql.org/firebirdtutorial/firebird-data-access-designer-ddex-installation.html


-Lancer le programme d'installation 

-Verifier que FirebirdClient...dll est dans la GAC (C:windows\assembly)
-Sinon executer 
"C:\Program Files\FirebirdClient\gacutil.exe" -i FirebirdSql.Data.FirebirdClient.dll

-Dans FirebirdDDEXProviderPackageLess32.reg remplacer %path% par
"C:\\Program Files\\FirebirdClient\\FirebirdSql.VisualStudio.DataTools.dll"

-lancer ce fichier : FirebirdDDEXProviderPackageLess32.reg

-Modifier fichier machine.config
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Machine.config update

Add the following two sections to machine.config (located usually at C:\WINDOWS\Microsoft.NET\Framework\v2.0.50727\CONFIG\machine.config and C:\WINDOWS\Microsoft.NET\Framework64\v2.0.50727\CONFIG\machine.config on 64-bit system).

<configuration>
  <configSections>
    <section name="firebirdsql.data.firebirdclient" type="System.Data.Common.DbProviderConfigurationHandler, System.Data, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" />
  </configSections>
  <system.data>
    <DbProviderFactories>
      <add name="FirebirdClient Data Provider" invariant="FirebirdSql.Data.FirebirdClient" description=".Net Framework Data Provider for Firebird" type="FirebirdSql.Data.FirebirdClient.FirebirdClientFactory, FirebirdSql.Data.FirebirdClient, Version=%Version%, Culture=%Culture%, PublicKeyToken=%PublicKeyToken%" />
    </DbProviderFactories>
  </system.data>
</configuration> 

And subst:
    %Version% With the version of the provider assembly that you have in the GAC.
    %Culture% With the culture of the provider assembly that you have in the GAC.
    %PublicKeyToken% With the PublicKeyToken of the provider assembly that you have in the GAC.