BlueCollar.SQLiteRepository.SQLiteRepository C# (CSharp) Method

        public SQLiteRepository(string connectionString)
        {
            connectionString = (connectionString ?? string.Empty).Trim();

            if (string.IsNullOrEmpty(connectionString))
            {
                connectionString = "data source=|DataDirectory|BlueCollar.sqlite;synchronous=Off;journal mode=Off;version=3";
            }

            SQLiteConnectionStringBuilder builder = new SQLiteConnectionStringBuilder(connectionString);
            builder.DataSource = BlueCollarSection.Section.ResolvePath(builder.DataSource);
            builder.DateTimeKind = DateTimeKind.Utc;

            EnsureDatabase(builder.DataSource);
            this.ConnectionString = builder.ConnectionString;

            try
            {
                this.defaultIsolationLevel = builder.DefaultIsolationLevel;
            }
            catch (NullReferenceException)
            {
                this.defaultIsolationLevel = IsolationLevel.Serializable;
            }

            this.connection = new SQLiteConnection(this.ConnectionString);
            this.connection.Open();
        }