Problem in verify signature.

hi:
I having a error message "Can not find the origin singer" when try to verify
signature. The certificate use to sign in the localuser store (with private
key)? any body can help...

// try this also...getting same error message
// SignedCms signedMessage = new SignedCms(SubjectIdentifierType.
IssuerAndSerialNumber | SubjectIdentifierType.SubjectKeyIdentifier);

SignedCms signedMessage = new SignedCms();

byte[] decryptedBytes = encryptedMessage.ContentInfo.Content;
signedMessage.Decode(decryptedBytes);

X509Certificate2Collection col = new X509Certificate2Collection
(_signer);
// check the signature
signedMessage.SignerInfos[0].CheckSignature(col,true);

// try this also, getting the same message
//signedMessage.CheckSignature(true);
.

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