XML : XML Validation against XSD always returns true

I have a c# script that validates an XML document against an XSD document, as follows:

      static bool IsValidXml(string xmlFilePath, string xsdFilePath)      {            XmlReaderSettings settings = new XmlReaderSettings();          settings.Schemas.Add(null, xsdFilePath);          settings.ValidationType = ValidationType.Schema;          settings.Schemas.Compile();            try          {              XmlReader xmlRead = XmlReader.Create(xmlFilePath, settings);              while (xmlRead.Read())              { };              xmlRead.Close();          }          catch (Exception e)          {              return false;          }            return true;      }    

I've compiled this after looking at a number of MSDN articles and questions here where this is the solution. It does correctly validate that the XSD is formed well (returns false if I mess with the file) and checks that the XML is formed well (also returns false when messed with).

I've also tried the following, but it does the exact same thing:

      static bool IsValidXml(string xmlFilePath, string xsdFilePath)      {            XDocument xdoc = XDocument.Load(xmlFilePath);          XmlSchemaSet schemas = new XmlSchemaSet();          schemas.Add(null, xsdFilePath);            try          {              xdoc.Validate(schemas, null);          }          catch (XmlSchemaValidationException e)          {              return false;          }            return true;      }    

I've even pulled a completely random XSD off the internet and thrown it into both scripts, and it still validates on both. What am I missing here?

Using .NET 3.5 within an SSIS job.