第二次作业1-10的四则运算

Form1.cs
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;

namespace Windowss
{
    public partial class Form1 : Form
    {
        public Form1()

        {
            InitializeComponent();

        }
        public static int Count = 0;//题目总数
        public static int right = 0;//正确的题目总数
            

        private void button1_Click(object sender, EventArgs e)
        {
        
            RandomNum();
        }
        //产生一个1-10的随机数并在文本框中显示
                private void  RandomNum()
                {
                    Random ran=new Random ();
                    int n1,n2;
                   n1=ran .Next (1,11);//产生一个数
                   n2 = ran.Next(1, 11);//产生一个数
                   textBox1.Text = n1.ToString();
                   textBox2.Text = n2.ToString();
                   textBox3.Text = "";
                   Count++;
                               }
        private void textBox3_KeyDown(object sender, KeyEventArgs e)
        {

            int txb;
            string tb=textBox4.Text;
            switch(tb)
            {
                case "+":
                    txb =int. Parse(textBox1.Text)+int .Parse (textBox2 .Text );
                    break ;
                case "-":
                    txb =int .Parse ( textBox1 .Text)-int .Parse ( textBox2.Text  );
                    break;
                case "*": 
                    txb =int .Parse ( textBox1 .Text )*int .Parse ( textBox2 .Text );
                    break ;
                default:
                    txb =int .Parse ( textBox1 .Text )/int .Parse ( textBox2 .Text );
                    break ;
            }

                        if ( e.KeyCode ==Keys.Enter )

                    {
                       if ( textBox3.Text == txb.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)
                {
                    new Form3().Show();
                }

                private void label3_Click(object sender, EventArgs e)
                {
                    textBox4.Text = "+";
                }

                private void label4_Click(object sender, EventArgs e)
                {
                    textBox4.Text = "-";
                }

                private void label5_Click(object sender, EventArgs e)
                {
                    textBox4.Text = "*";
                }

                private void label6_Click(object sender, EventArgs e)
                {
                    textBox4.Text = "/";
                }

                private void button2_Click_1(object sender, EventArgs e)
                {
                    textBox3.Enabled = false;
                    Form2 frm2 = new Form2();
                    frm2.ShowDialog();
                }

                private void button3_Click_1(object sender, EventArgs e)
                {
                    new Form3().Show();
                }
                        
            }
        }

From2.cs
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;

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

        private void Form2_Load(object sender, EventArgs e)
        {
            textBox1.Text = Form1.Count.ToString();//题目总数
            textBox2.Text = Form1.right.ToString();//正确题目数目
            textBox3.Text = ((Form1.right / (double)(Form1.Count)) * 100).ToString() + "%";//题目正确率
        }

        private void button1_Click(object sender, EventArgs e)
        {
            this.Close();
        }
    }
}

From3
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;

namespace Windowss
{
    public partial class Form3 : Form
    {
        public Form3()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            this.Close();
        }
    }
}