label1.Text = "Succeeded";
        label2.Text = "";
        XmlSchemaCollection xsc = new XmlSchemaCollection();
        xsc.Add("generic", Server.Mappath("abc.xsd"));
        Validate(Server.Mappath("abc.xml"), xsc);

private void Validate(String filename, XmlSchemaCollection xsc)
    {
        XmlTextReader reader = null;
        XmlValidatingReader vreader = null;
        reader = new XmlTextReader(filename);
        vreader = new XmlValidatingReader(reader);
        vreader.Schemas.Add(xsc);
        vreader.ValidationEventHandler += new ValidationEventHandler(ValidationCallBack);
        try
        {
            while (vreader.Read()) { }
        }
        catch
        {
            label2.Text = "XML Document is not well-formed.";
        }
        vreader.Close();
    }
    public void ValidationCallBack(object sender, ValidationEventArgs args)
    {
        label1.Text = "Failed:";
        label2.Text += "Validation error: " + args.Message + "
";
    }