Sign Document with Signature validated Automatically

Hi everyone
I want to sign a PDF document with a certificate “.pfx”, I have adobe pro extended and visual studio 2008 for do that and I’m using visual c sharp to develop my application until here everything it’s ok the problem is after to sign the document when I open the document adobe can’t verify the signature and timestamp, I need to validate the signature manually and I don’t need that, I need the validate the signature and timestamp automatically because I need to distributed a lot pdf sign documents to my customers and I can’t provide exclusive solutions for each one of them for validate the segnatures, I hope you can help me with this issue.
My Best Regards

What do you mean by "can't verify"? That the validity is unknown? Does it say why?
Most likely this is due to an unknown root certificate for the .pfx. What is the root/CA for the .pfx?

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Thanks. That worked! Back in the sunshine again
The message is as seen below : "signature is timestamped but TS has expired"
I am assuming this is the right message. If not, do respond.

Sign Document with Signature validated Automatically

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