//Load tables for selected user in to the list box
        //Value of each list item is the sql query to create that item!
        void loadUserHistory()
        {
            if (global.sqlLiteDbFilePath.Length > 3)
            {
                addStatus("db file: " + global.sqlLiteDbFilePath);
                List<ComboboxItem> tblList = SqlLiteDbUtil.getTableList(global.sqlLiteDbFilePath);
                if (null != tblList && tblList.Count > 0)
                {

                    tblList.Sort();
                    foreach (ComboboxItem ci in tblList)
                    {
                        listBoxTables.Items.Add(ci);
                    }
                    addStatus("Skype history found for the user " + comboBoxUsers.Text + ". To view records, please select the table from the left list box.");
                    if (global.connectDb)
                        buttonExportAll.Enabled = true;
                }
                else
                {
                    addStatus("No database file found for the user");
                }
            }
            
        }