<p>Has anyone had any luck of using Oracle from .Net on a 64 bit machine, and using the UDT capabilities of Oracle?</p>

<p>I've been able to use an x64 ODP.Net client, but cannot find one with any support for UDTs.</p>

<p>Thanks</p>

<p>Nick</p>

<p>[Edit]
I've posted an answer below. The latest (as of December 2008) release is 11.1.0.7. This has support for 64 bit and UDT.</p>

UDT capability is only listed in 11g clients and the latest 64 bit client is 10.2.0.3.
Not the answer you wanted, but the one that Oracle seems to be giving.
Actually I'm glad you asked this question.  We're working on migrating to 64 bit server code and I wouldn't have thought to check for this.