Beginner C# expected class, delegates, etc. errors math quiz

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace Multiplication_Quiz
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        // Create a Random object to generate random numbers.
        Random randomizer = new Random();

        // These ints will store the numbers for the multiplication problem. 
        int multiplicand;
        int multiplier;
        
        // This will show the time left
        int timeLeft;

        
        private void StartButton_Click(object sender, EventArgs e)
        {
            startButton.Enabled = false;
        }

        
        public void StartTheQuiz()
        {
            // Fill in the multiplication problem.
            multiplicand = randomizer.Next(2, 12);
            multiplier = randomizer.Next(2, 12);
            timesLeftLabel.Text = multiplicand.ToString();
            timesRightLabel.Text = multiplier.ToString();
            product1.Value = 0;

            // Start the timer.
            timeLeft = 60;
            timeLabel.Text = "60 seconds";
            timer1.Start();
        }

        private void answer_Enter(object sender, EventArgs e)
        {
            // Select the whole answer in the NumericUpDown control.
            NumericUpDown answerBox = sender as NumericUpDown;
            if (answerBox != null)
            {
                int lengthOfAnswer = answerBox.Value.ToString().Length;
                answerBox.Select(0, lengthOfAnswer);
            }
        }

        private void timer1_Tick(object sender, EventArgs e)
        {
            if (timeLeft > 0)
            {
                // Display the new time left 
                // by updating the Time Left label.
                timeLeft = timeLeft - 1;
                timeLabel.Text = timeLeft + " seconds";
            }
            else
            {
                // If the user ran out of time, stop the timer, show 
                // a MessageBox, and fill in the answers.
                timer1.Stop();
                timeLabel.Text = "Time's up!";
                MessageBox.Show("You didn't finish in time.", "Sorry");

                product1.Value = multiplicand * multiplier;
                startButton.Enabled = true;
            }
        }

        

        private void timeLabel_Click(object sender, EventArgs e)
        {
        }
        /// <summary> 
        /// Check the answer to see if the user got everything right. 
        /// </summary> 
        /// <returns>True if the answer's correct, false otherwise.</returns> 
        
        private bool CheckTheAnswer()
        {
            return multiplicand * multiplier == product1.Value;
        }

        private void timer1_Tick_1(object sender, EventArgs e)
        {

        }
    }
}