SignedCms.RemoveSignature Method (SignerInfo)
The SignerInfo object.method removes the signature for the specified
Assembly: System.Security (in System.Security.dll)
A null reference was passed to a method that does not accept it as a valid argument.
The value of an argument was outside the allowable range of values as defined by the called method.
A cryptographic operation could not be completed.
Available since 2.0