1. Read the XML file content as Stream, TextReader or XmlReader.

2. Read the Schema file content as Stream, TextReader or XmlReader.

3. Create a new instance of XmlSchema object.

4. Set XmlSchema object by calling XmlSchema.Read() method and passing the content of Schema file and ValidationEventHandler method address to it.

5. Create a new instance of XmlReaderSettings object.

6. Set ValidationType for XmlReaderSettings object to Schema.

7. Add your XmlSchema object to XmlReaderSettings Schemas collection by calling its Schemas.Add() method.

8. Add your ValidationEventHandler method address to XmlValidationReader's ValidationEventHandler handler.

9. Create a new instance of XmlReader object and pass your XML file content (as Stream or a Reader object) and XmlReaderSettings object to it.

10. Call Read() method of the Reader or Stream object to contain your XML file content in a loop to parse and validate it completely.

11. Add your logic to ValidationEventHandler method you created to implement what you want to be done in the validation process.

private void ValidatingProcess(string XSDPath, string XMLPath)
{
    try
    {
        // 1- Read XML file content
        this.Reader = new XmlTextReader(XMLPath);

        // 2- Read Schema file content
        StreamReader SR = new StreamReader(XSDPath);

        // 3- Create a new instance of XmlSchema object
        XmlSchema Schema = new XmlSchema();
        // 4- Set Schema object by calling XmlSchema.Read() method
        Schema = XmlSchema.Read(SR,
            new ValidationEventHandler(ReaderSettings_ValidationEventHandler));

        // 5- Create a new instance of XmlReaderSettings object
        XmlReaderSettings ReaderSettings = new XmlReaderSettings();   
        // 6- Set ValidationType for XmlReaderSettings object
        ReaderSettings.ValidationType = ValidationType.Schema;               
        // 7- Add Schema to XmlReaderSettings Schemas collection
        ReaderSettings.Schemas.Add(Schema);

        // 8- Add your ValidationEventHandler address to
        // XmlReaderSettings ValidationEventHandler
        ReaderSettings.ValidationEventHandler +=
            new ValidationEventHandler(ReaderSettings_ValidationEventHandler);

        // 9- Create a new instance of XmlReader object
        XmlReader objXmlReader = XmlReader.Create(Reader, ReaderSettings);


        // 10- Read XML content in a loop
        while (objXmlReader.Read())
        { /*Empty loop*/}

    }//try
    // Handle exceptions if you want
    catch (UnauthorizedAccessException AccessEx)
    {
        throw AccessEx;
    }//catch
    catch (Exception Ex)
    {
        throw Ex;
    }//catch
}

private void ReaderSettings_ValidationEventHandler(object sender,
    ValidationEventArgs args)
{
    // 11- Implement your logic for each validation iteration
    string strTemp;
    strTemp = "Line: " + this.Reader.LineNumber + " - Position: "
        + this.Reader.LinePosition + " - " + args.Message;

    this.Results.Add(strTemp);
}