private void button2_Click(object sender, EventArgs e)
        {
            richTextBox1.AppendText("\n" + DateTime.Now + " ::- " + "Start split ...");
            int count = int.Parse(textBox3.Text);

            XmlProcessorUtil.split(count, pList.productCollection, outputXmlLocation);
            richTextBox1.AppendText("\n" + DateTime.Now + " ::- " + "Split complete");
        }
        private void button4_Click(object sender, EventArgs e)
        {
            richTextBox1.AppendText("\n" + DateTime.Now + " ::- " + "Loading xml file.\n\nPlease wait ...\n");
            List <ProductDetail> pl = XmlProcessorUtil.processXml(inputXmlFileName);

            richTextBox1.AppendText("\n" + DateTime.Now + " ::- " + "Loading Complete");
            textBox2.Text           = "" + pl.Count;
            pList.productCollection = pl;
        }