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answers:

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I have an X.509 certificate and need to get the size of its key (in bits) - e.g., 1024 2048 etc. I have looked at X509Certificate2 and also the bouncycastle X509Certificate classes but can't see how to get the key size.

+1  A: 

You surely have access to the public key. The key length is public key's size: this.PublicKey.Key.KeySize;
To see an implemented solution, check out this article on MSDN

Kamyar
Thank you Kamyar.
swisstony
No Problem tony.
Kamyar