Updata Infopath XML Node Value in Office 365

class Program
{
    private static string szSiteUrl = "https://xxxxxxx.sharepoint.com/xxxx/xxxxx/";
    private static string USERNAME = "xxxxxx";
    private static string PASSWORD = "xxxxx";
    static void Main(string[] args)
    {
        UpdateFields();
    }
    static void UpdateFields()
    {
        int iItemID = 0;
        int iLowerLimit = 1;
        int iUpperLimit = 10;
        try
        {
            ClientContext context = new ClientContext(szSiteUrl);
            var password = new SecureString();
            foreach(char c in PASSWORD.ToCharArray()) password.AppendChar(c);
            context.Credentials = new SharePointOnlineCredentials(USERNAME, password);
            Web web = context.Web;
            List lstName = context.Web.Lists.GetByTitle("xxxxxxxx");
            View view = lstName.Views.GetByTitle("xxxxx");
            context.Load(view);
            context.ExecuteQuery();
            CamlQuery query = CamlQuery.CreateAllItemsQuery();
            query.ViewXml = "<View><ViewFields><FieldRef Name='ID'/>" +
                "<FieldRef Name='FileRef'/>" +
                "<FieldRef Name='XXXX'/>" +
                "</ViewFields> <RowLimit>10</RowLimit> </View>";
            ListItemCollection wifs = lstWorkIntake.GetItems(query);
            context.Load(wifs);
            context.ExecuteQuery();
            Console.WriteLine(wifs.Count);
            context.ExecuteQuery();
            foreach(ListItem item in wifs)
            {
                iItemID = Convert.ToInt32(item["ID"]);
                if ((iItemID >= iLowerLimit) && (iItemID <= iUpperLimit))
                {
                    ProcessListItem(item, context);
                }
            }
            Console.WriteLine(" Items updated");
            Console.ReadLine();
        }
        catch (Exception ex)
        {
            Console.WriteLine(iItemID + "--ERROR" + ex.Message);
        }
    }
    private static void ProcessListItem(ListItem item, ClientContext context)
    {
        context.Load(item.File);
        context.ExecuteQuery();
        ProcessNode(item, "my:XXXXX", context);
    }
    private static void ProcessNode(ListItem item, string strNodeName, ClientContext context)
    {
        Console.WriteLine("Processing Item :" + item.Id + " Field Name: " + strNodeName);
        var fileInfo = Microsoft.SharePoint.Client.File.OpenBinaryDirect(context, item["FileRef"].ToString());
        try
        {
            XmlDocument xml = new XmlDocument();
            using(Stream stream = fileInfo.Stream)
            {
                xml.Load(stream);
                XmlNodeList nodeList = xml.GetElementsByTagName(strNodeName);
                foreach(XmlNode node in nodeList)
                {
                    foreach(XmlNode childNode in node)
                    {
                        if (childNode.InnerText != "")
                        {
                            if (childNode.InnerText.Contains("false"))
                            {
                                childNode.InnerText = "0";
                            }
                            if (childNode.InnerText.Contains("true"))
                            {
                                childNode.InnerText = "1";
                            }
                        }
                    }
                }
                byte[] xmlData = System.Text.Encoding.UTF8.GetBytes(xml.OuterXml);
                using(MemoryStream ms = new MemoryStream(xmlData))
                {
                    Microsoft.SharePoint.Client.File.SaveBinaryDirect(context, item["FileRef"].ToString(), ms, true);
                }
            }
        }
        catch (Exception ex)
        {
            Console.WriteLine("Error on Item :" + item.Id + " Field Name: " + strNodeName + " Exception Message: " + ex.Message);
        }
    }
}