FireLance/GSMParser/GsmMgr.cs

using Microsoft.Data.Sqlite;
using System;
using System.IO;
using Firelance.Interfaces;
using GSMParser.Inferfaces;

namespace Gsm
{
    public class GsmMgr : IFlcBaseDBConnection, IGsmSqliteDBConnection
    {
        public SqliteConnection Database { get; private set; }

        public void OpenConnection(string dbLocation, int port)
        {
            if (File.Exists(dbLocation) == false)
            {
                throw new FileNotFoundException(dbLocation);
            }

            Database = new SqliteConnection($"Data Source={dbLocation};Mode=ReadOnly");
            Database.Open();
        }

        public void CloseCurrentConnection()
        {
            Database.Close();
        }

        public bool IsConnectionOpen()
        {
            return Convert.ToBoolean(Database.State);
        }
    } 
}