XML编码格式转换问题，急！！！

我要在网页上上传一个XML文件，我在C#中写了一个验证XML文件格式的方法：
private bool ValidateXml(string xmlFilePath)
    {
        string xsdPath = Request.PhysicalApplicationPath + @"Files\example\rcpt.xsd";
        //使用xmlReader验证XML格式
        // Set the validation settings.
        XmlReaderSettings settings = new XmlReaderSettings();
        settings.ValidationType = ValidationType.Schema;
        settings.Schemas.Add(null, xsdPath);
        settings.ValidationFlags |= XmlSchemaValidationFlags.ProcessInlineSchema;
        settings.ValidationFlags |= XmlSchemaValidationFlags.ReportValidationWarnings;
        settings.ValidationEventHandler += new ValidationEventHandler(settings_ValidationEventHandler);

        // Create the XmlReader object.
        XmlReader reader = XmlReader.Create(xmlFilePath, settings);

        // Parse the file.
        try
        {
            while (reader.Read());
        }
        catch (Exception ex)
      &nb