How to validate prerequisite for ODP and Oracle Client connection

Hi.
I have a very simple application on .Net that connect to Oracle using ODP (was compiled with Oracle.DataAccess dll 10.2).
I want to check "connection prerequisite" (application will be able to connect to DB) before installing this aplication on other computers?
How can I check that ODP.NET version 10.2 or higher is installed on target host (registry check is not enopugh)?
I know that I can check ODP entries in registry - but this will not check Oracle Client and compatibility between client and ODP.
Also, if ODP was installed by ODAC XCopy installation - registry may be not updated by new ODP entry.
And - if I am installing on the computer, DB was installed on, Oracle Client can be not installed separately.
And one more issue: When I tried to run "test connection" method from installation, that use referenced dll on machine, that has only ODAC (with ODP) 11, - "Oracle.DataAccess.Client.OracleException The provider is not compatible with the version of Oracle client at Oracle.DataAccess.Client.OracleInit.Initialize()
at Oracle.DataAccess.Client.OracleConnection..cctor()" error message was thrown (policies for both ODAC 10.2 and 11 are exists in GAC (assembly), pointing to Oracle.DataAccess 11 from ODP 2x bin).
So, How and which components can I check to ensure appropriate versions of ODP and Oracle Client were installed and application will be connected?
Thank you in advance!

Hi,
You could check for the presense of Oracle.DataAccess.dll in the GAC. Bear in mind you'd also want to check the version and whether a policy files exists as well as a newer version + policy file will work too (but not without the policy file).
That wouldn't confirm the install is valid and works though, and I don't know of a way you could easily check that, apart from perhaps simply trying to run a small exe that attempts a connection to the database.
With respect to the type initializer exception, that occurs when ODP cant find the right oraops*.dll or oci.dll, usually due to the wrong one being found, but can also occur if one is not found at all. Quite often this is due to the application including ODP in its bin directory rather than letting ODP get picked up out of the gac. Prior to 10.2.0.2.20, ODP loads the dependencies based in PATH so multiple homes can cause it as well. 10.2.0.2.20 and higher ODP loads dll's based on DLLPATH registry entry.
Hope it helps,
Greg

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