private bool ExecuteSQLQuery(string filename, string filesize)
        {
        String query = "SELECT * FROM local_entry WHERE ";
            query += "filename =\"" + filename + "\" ";
            query += "filesize =" + filesize + " ";

            var results = GetDataTable(query);

            if (results.Rows.Count > 0)
            {
                return true;
            }
            return false;
        }

        private void Comparebutton_Click(object sender, EventArgs e)
        {
            sqlite = new SQLiteConnection("Data Source=" + Dbpath.Text);

            List<KeyValuePair<string, string>> validData = new List<KeyValuePair<string, string>>();

            XDocument doc = XDocument.Load(XMLpath.Text);
            if (doc != null)
            {
                var items = doc.Element("chrome_cache").Elements("item");
                foreach (var item in items)
                {
                    string filename = item.Element("filename").Value;
                    string filesize = item.Element("file_size").Value;

                    if (filename != "")
                    {
                        if (SQLQuery(filename, filesize))
                            validData.Add( new KeyValuePair<string, string>(filename, filesize) );
                    }
                }
            }
        }