How to sign with silverlight a database registry

How to sign with silverlight a database registry

i have my key pair in Silverlight client and i want to sign a database registry? Is possible? What kind of XML i will generate: detached, enveloped, enveloping?

I use an internet example but it uses the System.Cryptography namespace to sign and create the XMLDSig but the namespace is not valid in Silvelight. I dont want to use another libraries like Chilkat or Blackbox.

Thanks on advanced

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