XDocument Validate not validating complete xml

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XML

C#3.5

XSD

We are trying to validate xml based on schema with below code

XElement xmldata = XElement.Load(@"Ad.xml");
XDocument acordRequestxml = XDocument.Parse(xmldata.ToString());
XmlSchemaSet schemaSet = new XmlSchemaSet();
schemaSet.Add("", @"Schema.xsd");
acordRequestxml.Validate(schemaSet, (sender, e) =>
            {

                if (sender is XObject)
                {
                    XElement dat = (XElement)sender;

                    Console.WriteLine(e.Severity);
                    switch (e.Severity)
                    {
                        case XmlSeverityType.Error:
                            Console.WriteLine(MessageFormat(e.Message) + "\n" + "XPATH        : " + GetPath(dat) + "\n");
                            break;

                        case XmlSeverityType.Warning:
                            Console.WriteLine(MessageFormat(e.Message) + "\n" + "XPATH        : " + GetPath(dat) + "\n");
                            break;
                    }
                }
            });

above code validates complete file all mandatory elements exists. but not validating if mandatory element missing or if sequence is changed.

how to validate complete xml file even mandatory missing or sequence differs?

want to get all errors in the xml at once.