Xml validation using XSD schema

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Would not this do what you are after ?

Create an XmlReaderSettings object and enable warnings through that object.

Unfortunately, there seems to be no way to pass your own XmlReaderSettings object to XmlDocument.Validate().
Instead, you can use a validating XmlReader and an XmlNodeReader to validate an existing XmlDocument (using a XmlNodeReader with StringReader rather than an XmlDocument)

XmlDocument x = new XmlDocument();
x.LoadXml(XmlSource);

XmlReaderSettings settings = new XmlReaderSettings();
settings.CloseInput = true;     
settings.ValidationEventHandler += Handler;

settings.ValidationType = ValidationType.Schema;
settings.Schemas.Add(null, ExtendedTreeViewSchema);
settings.ValidationFlags =
     XmlSchemaValidationFlags.ReportValidationWarnings |
XmlSchemaValidationFlags.ProcessIdentityConstraints |
XmlSchemaValidationFlags.ProcessInlineSchema |
XmlSchemaValidationFlags.ProcessSchemaLocation ;

StringReader r = new StringReader(XmlSource);

using (XmlReader validatingReader = XmlReader.Create(r, settings)) {
        while (validatingReader.Read()) { /* just loop through document */ }
}

And the handler:

private static void Handler(object sender, ValidationEventArgs e)
{
        if (e.Severity == XmlSeverityType.Error || e.Severity == XmlSeverityType.Warning)
          System.Diagnostics.Trace.WriteLine(
            String.Format("Line: {0}, Position: {1} \"{2}\"",
                e.Exception.LineNumber, e.Exception.LinePosition, e.Exception.Message));
}

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