The following code gives:
An unhandled exception of type 'System.InvalidOperationException' occurred in System.Security.dll
Additional information: The recipient certificate is not specified.
SignedCms cmsMsg;
ContentInfo cInfo;
byte[] content;
content =
new byte[] { 0, 1, 1, 2, 4, 6, 6, 23, 123 };cInfo = new ContentInfo(content);
cmsMsg = new SignedCms(SubjectIdentifierType.IssuerAndSerialNumber, cInfo, false);
MessageBox.Show(Environment.UserInteractive.ToString());
cmsMsg.ComputeSignature();
What do I need to do to make it pop a certificate selection window and proceed with signing Why and where do I need to provide the recipient certificate
Thanks a lot for your help.
Manoj K Srivastava

SignedCms.ComputeSignature() gives "The recipient certificate is not specified" exception
lonepalm
Hi Manoj,
You can use the overload of ComputeSignature which takes a CmsSigner and a slient flag:
cmsMsg.ComputeSignature(new CmsSigner(SubjectIdentifierType.IssuerAndSerialNumber, false);
-Shawn