private void Deletbtn_Click(object sender, EventArgs e)
    {
        XmlNode node = doc.SelectSingleNode("//entry[@entryno='" +     Dgv.CurrentRow.Cells[0].Value + "']");

        try
        {
            if (node != null && Dgv.CurrentRow.Selected == true)
            {
                doc.DocumentElement.RemoveChild(node);

                // Trying to refresh the sequence each time an node is deleted.
                int Attrno = int.Parse(doc.SelectSingleNode("//entry[@entryno]").Value);
                do
                {
                    Attrno = 0;
                    Attrno++;
                } while (Attrno < doc.ChildNodes.Count);
                doc.SelectSingleNode("//entry[@entryno]").InnerText = Attrno.ToString();

                doc.Save(Application.StartupPath + @"SleepRecords.xml");
            }
            else
                MessageBox.Show("Click the left side of the grid to select a row to delete.", "Select row", MessageBoxButtons.OK, MessageBoxIcon.Information);
        }
        catch (Exception ex)
        {
            MessageBox.Show(ex.Message, "Error", MessageBoxButtons.OK, MessageBoxIcon.Exclamation);
        }
        ReloadData();
        Resetbtn_Click(Deletbtn, e);
        makePdf();
    }

XmlNodeList nodes = doc.SelectNodes("//entry");
            int max = 0;
            foreach (XmlNode node in nodes)
            {
                int nodeAttr = int.Parse(node.Attributes["entryno"].Value);
                max = nodeAttr;
            }
            max++;