C#小游戏之疯狂字母

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 englishWorld
{
    public partial class Form1 : Form
    {
        Random ra = new Random();
        public Form1()
        {
            InitializeComponent();
        }
        int count = 0;
        char num = '0';
        Label l = null;
        private void Form1_Load(object sender, EventArgs e)
        {
            this.label2.Text = "准备开始计分";
            ShowWorld();
        }
        public void ShowWorld()
        {
            int x = ra.Next(this.Width - 100);
            int y = ra.Next(this.Height - 100);
            l = new Label();
            l.Width = 25;
            l.Height = 25;
            num = (char)(ra.Next(26) + 97);
            l.Text = num + "";
            l.Font = new Font("黑体", 19, FontStyle.Bold);
            l.Location = new Point(x, y);
            this.Controls.Add(l);
        }

        private void Form1_KeyDown(object sender, KeyEventArgs e)
        {
            if ((e.KeyValue + 32) == (num + 0))
            {
                count += 100;
                this.label2.Text = "正确+100分";
            }
            else
            {
                count -= 100;
                this.label2.Text = "错误-100分";
            }
            this.label1.Text = count + "";
            this.Controls.Remove(l);
            ShowWorld();
        }
    }
}