SignedXml.CheckSignature fails in .NET 4 but it works in .NET 3.5, 3 or 2

Question

I have a response from a 3-rd party web service. I load an XmlDocument with that response.

  string txt = readStream.ReadToEnd();
  response = new XmlDocumen         


        

Answer 1

From .NET framework 4/4.5 the classes to work with x509 certificates and other security features are located in System.IdentityModel.dll. Search the respective classes in the namespace mentioned.