how to send digitally signed mail in c# with .cer file

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C#

ASP.NET

Hello Sir,

I am facing the problem for send digitally signed email.

When i run programme mail is sent successfully.
But when from iis then it's give me error.

Erroe is below,
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WindowsError: The system cannot find the file specified. errorCode: 0x2 Retry with new keyset... logged_on_user: bo_test Failed to get Cryptographic Service Provider createDetachedSignature.csp: The system cannot find the file specified. logged_on_user: bo_test Failed to create detached signature signer_address: esign@domain.com Failed to prepare email for sending. (3)
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Please Give me suggestion or solution to solve this problem.

It's urgent.

Thanks.</pre>