四则运算。。

public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        public static int Count = 0;

        public static int right = 0;
        public static int fault = 0;
        private void button1_Click(object sender, EventArgs e)
        {

            RandomNum();
        }
        private void RandomNum()
        {
            Random ran = new Random();
            int n1, n2;
            n1 = ran.Next(1, 10);
            n2 = ran.Next(1, 10);
            textBox1.Text = n1.ToString();
            textBox2.Text = n2.ToString();
            textBox3.Text = "";
            Count++;
        }

        private void timer1_Tick(object sender, EventArgs e)
        {

            {

                textBox3.Enabled = false;

                textBox3.Enabled = false;
                Form2 frm = new Form2();
                frm.ShowDialog();
            }

        }

        private void textBox3_KeyDown(object sender, KeyEventArgs e)
        {
            int sum;
            sum = int.Parse(textBox1.Text) + int.Parse(textBox2.Text);
            if (e.KeyCode == Keys.Enter)
            {
                if (textBox3.Text == sum.ToString())
                    right++;
                RandomNum();
            }
        }

        private void button2_Click(object sender, EventArgs e)
        {
            textBox3.Enabled = false;
            Form2 frm2 = new Form2();
            frm2.ShowDialog();
        }

        private void button3_Click(object sender, EventArgs e)
        {

        }

        private void label1_Click(object sender, EventArgs e)
        {

        }

        private void label2_Click(object sender, EventArgs e)
        {

        }

        private void textBox1_TextChanged(object sender, EventArgs e)
        {

        }

        private void label3_Click(object sender, EventArgs e)
        {

        }

        private void label3_Click_1(object sender, EventArgs e)
        {

        }

        private void label4_Click(object sender, EventArgs e)
        {

        }

        private void label5_Click(object sender, EventArgs e)
        {

        }

        private void textBox2_TextChanged(object sender, EventArgs e)
        {

        }
public partial class Form2 : Form
    {
        public Form2()
        {
            InitializeComponent();
        }

        private void Form2_Load(object sender, EventArgs e)
        {
            textBox1.Text = Form1.Count.ToString();
            textBox2.Text = Form1.right.ToString();
            textBox3.Text = ((Form1.right / (double)(Form1.Count)) * 100).ToString() + "%";
        }

        private void label1_Click(object sender, EventArgs e)
        {
            textBox1.Text = Form1.Count.ToString();
            textBox2.Text = Form1.fault.ToString();
        }

        private void label2_Click(object sender, EventArgs e)
        {

        }

        private void textBox2_TextChanged(object sender, EventArgs e)
        {

        }
    }

虽然费了很长时间写好了，但是还是有些小毛病，可能还是我学的不够好吧，希望以后会更加好好学习，做的更完美些