private async Task UpdateDropDownCategories()
        {
            con = new Npgsql.NpgsqlConnection(ConfigurationManager.ConnectionStrings["TalentDataContextPostgres"].ConnectionString);

            try
            {
                con.Open();
                sqlDataContext = new Agilisium.TalentManager.Model.TalentManagerDataContext();
                List <DropDownCategory> oldCategories = sqlDataContext.DropDownCategories.ToList();
                // update primary column id
                List <DropDownCategory> newCategories = postgressDataContext.DropDownCategories.ToList();
                foreach (DropDownCategory newRec in newCategories)
                {
                    int    oldPracticeID     = oldCategories.FirstOrDefault(p => p.CategoryName == newRec.CategoryName).CategoryID;
                    string qry               = $"UPDATE \"TalentManager\".\"DropDownCategory\" SET \"CategoryID\"={oldPracticeID} WHERE \"CategoryID\"={newRec.CategoryID}";
                    Npgsql.NpgsqlCommand cmd = new Npgsql.NpgsqlCommand(qry, con);
                    int val = await cmd.ExecuteNonQueryAsync();
                }
            }
            catch (Exception) { }
            finally
            {
                con.Close();
                con.Dispose();
            }
        }
        private async Task UpdateSystemSettings()
        {
            con = new Npgsql.NpgsqlConnection(ConfigurationManager.ConnectionStrings["TalentDataContextPostgres"].ConnectionString);

            try
            {
                con.Open();
                sqlDataContext = new Agilisium.TalentManager.Model.TalentManagerDataContext();
                List <SystemSetting> oldSettings = sqlDataContext.SystemSettings.ToList();
                // update primary column id
                postgressDataContext = new Agilisium.TalentManager.PostgresModel.TalentManagerDataContext();
                List <SystemSetting> newSettings = postgressDataContext.SystemSettings.ToList();
                foreach (SystemSetting newRec in newSettings)
                {
                    int    oldPracticeID     = oldSettings.FirstOrDefault(p => p.SettingName == newRec.SettingName).SettingEntryID;
                    string qry               = $"UPDATE \"TalentManager\".\"SystemSettings\" SET \"SettingEntryID\"={oldPracticeID} WHERE \"SettingEntryID\"={newRec.SettingEntryID}";
                    Npgsql.NpgsqlCommand cmd = new Npgsql.NpgsqlCommand(qry, con);
                    int val = await cmd.ExecuteNonQueryAsync();
                }
            }
            catch (Exception) { }
            finally
            {
                con.Close();
                con.Dispose();
            }
        }