load mod_spatialite using c# and System.Data.SQLite

TestSpatialite.cs

using System;
using System.Collections.Generic;
using System.Data.SQLite;
using System.IO;
using System.Linq;
using System.Runtime.InteropServices;
using System.Text;
using System.Threading.Tasks;

namespace TestSpatialite
{
    class Program
    {
        public static string getSqliteV3ConnectionString( string sqlitePath)
        {
            //Default Timeout is in seconds, useful for when sqlite is locked,
            //exception is returned after 1 second, default is 30 seconds.           
            return "Data source=" + sqlitePath + "; Version = 3; Default Timeout = 3;";
        }

        static bool is64bitProcess()
        {
            return ( IntPtr.Size == 8);
        }

        static bool is32bitProcess()
        {
            return ( IntPtr.Size == 4);
        }

        static void Main( string[] args)
        {
            string mod_spatialite_folderPath = "mod_spatialite-4.3.0a-win-amd64" ;

            if (is64bitProcess())
            {
                Console.WriteLine( "64bit process");
                mod_spatialite_folderPath = "mod_spatialite-4.3.0a-win-amd64" ;               
            }
            else if(is32bitProcess())
            {
                Console.WriteLine( "32bit process");
                mod_spatialite_folderPath = "mod_spatialite-4.3.0a-win-x86" ;               
            }
                       
            //using relative path, cannot use absolute path, dll load will fail
            //string mod_spatialite_dllPath = @"mod_spatialite-4.3.0a-win-amd64\mod_spatialite";           
            string path = Environment.GetEnvironmentVariable("Path" , EnvironmentVariableTarget.Machine) + ";" + mod_spatialite_folderPath;
            Environment.SetEnvironmentVariable("Path" , path, EnvironmentVariableTarget.Process);
                       
            string sqlitePath = "db.sqlite";

            string sqliteConnectionString = getSqliteV3ConnectionString(sqlitePath);
            System.Reflection. Assembly[] arAssemblies = System.AppDomain.CurrentDomain.GetAssemblies();
            using ( var sqliteConnection = new SQLiteConnection(sqliteConnectionString))
            {
                sqliteConnection.Open();
                Console.WriteLine( "Load-ing mod_spatialite");
                string mod_spatialite_dllPath = mod_spatialite_folderPath + @"\mod_spatialite" ;
                sqliteConnection.LoadExtension(mod_spatialite_dllPath);
                Console.WriteLine( "Load-ed mod_spatialite");
                //bool sqliteExceptionThrown = false;
                //try
                //{
                //    sqliteConnection.Execute("update table set column1 = 1;");
                //}
                //catch (System.Data.SQLite.SQLiteException sqliteException)
                //{
                //    sqliteExceptionThrown = true;
                //}


                //}
              
            }
            
            Console.ReadLine();
        }
    }
}