string dll32 = System.Windows.Forms.Application.StartupPath + @"\System.Data.SQLite-32.DLL";

            string dll64 = System.Windows.Forms.Application.StartupPath + @"\System.Data.SQLite-64.DLL";

            string dllpath = System.Windows.Forms.Application.StartupPath + @"\System.Data.SQLite.dll";

            string systemtype = string.Empty;

            systemtype = Detect32or64();

            if (systemtype == "32" || systemtype == string.Empty)

            {

                try

                {

                    using (FileStream fs = File.Create(dllpath)) {; }

                    File.Copy(dll32, dllpath, true);

                }

                catch

                {

                    ;

                }

            }

            else if (systemtype == "64")

            {

                try

                {

                    using (FileStream fs = File.Create(dllpath)) { }

                    File.Copy(dll64, dllpath, true);

                }

                catch

                {

                    ;

                }

            }

 

 

 

 

private static string Detect32or64()

        {

            switch (IntPtr.Size)

            {

                case 8:

                    return "64";

                default:

                    return "32";

            }

        }