string username = txtBoxUsername.Text;
        string password = txtBoxPassword.Text;

        using (SQLiteConnection con = new SQLiteConnection("Data Source=Users.sqlite;Version=3;"))
        {
            SQLiteCommand cmd = new SQLiteCommand("select * from UserInfo where username like @username and password = @password;");
            cmd.Parameters.AddWithValue("@username", username);
            cmd.Parameters.AddWithValue("@password", password);
            cmd.Connection = con;
            con.Open();
        }
    }