c# .Net XML validate xml file using xsd schema

I talked about using XML file in the last few posts, and especially pointed out the advantage of using xml as interface.
For example: Your mate send you a xml file which contains the information in a format that you defined. You can easily
read and write code without actually getting the xml file because you design the schema.
Now that I successfully create such file, I was wondering the ability to handle errors. I am more aware that what I am gonna
process (xml file) is actually violate the designed format. So I did some research, and did the following things:

• Generate the schema xsd file for my designed xml file
• Before processing, using schema xsd file to validate against xml file
• Report error
  

Here are some code examples:

if (Validate(strFile, Properties.Settings.Default.schema) != true)
       {
            MessageBox.Show("XML file doesn't matches the schema! Please verify the input format!");
            return;
       }

        static int numErrors = 0;
        static string msgError = "";

        private static void ErrorHandler(object sender, ValidationEventArgs args)
        {
            msgError = msgError + "\r\n" + args.Message;
            numErrors++;
        }

        private static bool Validate(string xmlFilename, string xsdFilename)
        {
            return Validate(GetFileStream(xmlFilename), GetFileStream(xsdFilename));
        }

        private static void ClearErrorMessage()
        {
            msgError = "";
            numErrors = 0;
        }

        // returns a stream of the contents of the given filename
        private static Stream GetFileStream(string filename)
        {
            try
            {
                return new FileStream(filename, FileMode.Open, FileAccess.Read);
            }
            catch
            {
                return null;
            }
        }

        private static bool Validate(Stream xml, Stream xsd)
        {
            ClearErrorMessage();
            try
            {
                XmlTextReader tr = new XmlTextReader(xsd);
                XmlSchemaSet schema = new XmlSchemaSet();
                schema.Add(null, tr);

                XmlReaderSettings settings = new XmlReaderSettings();
                settings.ValidationType = ValidationType.Schema;
                settings.Schemas.Add(schema);
                settings.ValidationFlags |= XmlSchemaValidationFlags.ReportValidationWarnings;
                settings.ValidationEventHandler += new ValidationEventHandler(ErrorHandler);
                XmlReader reader = XmlReader.Create(xml, settings);

                // Validate XML data
                while (reader.Read())
                    ;
                reader.Close();

                // exception if validation failed
                if (numErrors > 0)
                    throw new Exception(msgError);

                tr.Close();
                return true;
            }
            catch
            {
                msgError = "Validation failed\r\n" + msgError;
                return false;
            }
        }