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Код

public class MessageValidator
    {
        // Validation Error Count
       public int ErrorsCount
       {
           get;
           set;
       }

        // Validation Error Message
       public string ErrorMessage
       {
           get;
           set;
       }

        const string XSDFileName = "SScript.xsd";

        public void Validate(Message mesg)
        {
            try
            {
                // Declare local objects                
                
                XmlReader vr = null;
                XmlSchema schem =XmlSchema.Read(File.Open(XSDFileName,FileMode.Open),ValidationHandler);
                
                // Text reader object
                XmlReaderSettings settings = new XmlReaderSettings();
                settings.ValidationType = ValidationType.Schema;
                settings.Schemas.Add(schem);
                settings.IgnoreWhitespace = true;
                settings.IgnoreComments = true;
                vr = XmlReader.Create(mesg.XmlMessage, settings); //Сдесь вылетает exception
               
                

                // Add validation event handler
               

                // Validate XML data

                while (vr.Read()) ;

                vr.Close();

                // Raise exception, if XML validation fails
                //if (ErrorsCount > 0)
                //{
                //    throw new Exception(ErrorMessage);
                //}

                // XML Validation succeeded
                Console.WriteLine("XML validation succeeded.\r\n");
            }
            catch (Exception error)
            {
                // XML Validation failed
                Console.WriteLine("XML validation failed." + "\r\n" +
                "Error Message: " + error.Message);
            }
        }


       public void ValidationHandler(object sender,
                                         ValidationEventArgs args)
       {
           ErrorMessage = ErrorMessage + args.Message + "\r\n";
           ErrorsCount++;
       }


    }