how to import database and use it locally in xamarin?

i have database and i want to import it in my project ,first i added a SQLITe component to my project and insert my DB to ASSEST folder

all the examples that i have seen it's about how to create database in project, but i already have the database and i want to make some query to display it in my app

i check this tutorial Use a local Database in Xamarin

but it does not work

this my code :

    void conndb ()
    {
        string dbName = "Chinook_Sqlite.sqlite";
        string dbPath = Path.Combine (Android.OS.Environment.ExternalStorageDirectory.ToString (), dbName);
        // Check if your DB has already been extracted.
        if (!File.Exists(dbPath))
        {
            using (BinaryReader br = new BinaryReader(Assets.Open(dbName)))
            {
                using (BinaryWriter bw = new BinaryWriter(new FileStream(dbPath, FileMode.Create)))
                {
                    byte[] buffer = new byte[2048];
                    int len = 0;
                    while ((len = br.Read(buffer, 0, buffer.Length)) > 0)
                    {
                        bw.Write (buffer, 0, len);
                    }
                }

            }
            using (var conn = new SQLite.SQLiteConnection(dbPath))
            {
                var cmd = new SQLite.SQLiteCommand (conn);
                cmd.CommandText = "select * from Album where AlbumId=1;";
                var r = cmd.ExecuteQuery<Album> ();

                Console.Write (r);
            }
        }
     }

any helps ?