Help to solve the problem in the code. I just can not understand what it is

MySqlConnection con = new MySqlConnection("Server=db4free.net;Port=3306;database=moyabd;User Id=leshiy;Password=leshiy1996;charset=utf8");

            try
            {
                
                if (con.State == ConnectionState.Closed)
                {
                    con.Open();
                    MySqlCommand cmd = new MySqlCommand("INSERT INTO tblTest(user,pass) VALUES(@user,@pass)", con);
                    
                    cmd.Parameters.AddWithValue("@user", etUsername.Text);
                    cmd.Parameters.AddWithValue("@pass", etPassword.Text);
                    cmd.ExecuteNonQuery();
                    txtSysLog.Text = "Регистрация прошла успешна";
                }
            }
            catch (MySqlException ex)
            {
                txtSysLog.Text = ex.ToString();
            }
            finally
            {
                con.Close();
            }