I get the following error when thowing a SOAP Exception:
The type System.Web.Services.Protocols.SoapException in Assembly
System.Web.Services, Version=1.0.5000.0, Culture=neutral,
PublicKeyToken=b03f5f7f11d50a3a is not marked as serializable

However, SOAPException most certainly is marked as serializable. It
inherits from SystemException which is. Why would I get this error?

I have seen this some already in newsgroups but with no posted answer.

I am getting this error in two cases. In once case I am using the MS
Exception Handler Application Block. IN the other I do not use that at
all, but instead just throw a SoapException. I follow the sample code
for creating it to the letter. You can see a mockup of it below:

   SoapException MySoapException;
   XmlDocument errordoc = new XmlDocument();
   XmlNode detail = errordoc.CreateNode(XmlNodeType.Element,
                SoapException.DetailElementName.Name,
                SoapException.DetailElementName.Namespace);

   detail.InnerText = "A detailed error message goes here";
   MySoapException = new SoapException("Code Location goes here",
                SoapException.ServerFaultCode,
                Context.Request.Url.AbsoluteUri, detail, null );

   throw MySoapException;

Thanks in advance