c#百位数出题机的代码

我自己编的软件，C#，不知道行不行

 //hdghsugv制作
 private void button17_Click(object sender, EventArgs e)
        {
            if (fanwei1.Text == "" || fanwei2.Text == "")
            {
                MessageBox.Show("错误！");
            }
            else
            {
                int tmp1, tmp2;
                int fw1 = Convert.ToInt32(fanwei1.Text);
                int fw2 = Convert.ToInt32(fanwei2.Text);
                if (fw1 < fw2)
                {
                    if (fhjia.Checked == true)
                    {
                        Random r = new Random();
                        tmp1 = r.Next(fw1, fw2);
                        tmp2 = r.Next(fw1, fw2);
                        textBox87.Text = tmp1.ToString() + "+" + tmp2.ToString();
                    }
                    else if (fhjian.Checked == true)
                    {
                        Random r = new Random();
                        tmp1 = r.Next(fw1 + 10, fw2 + 10);
                        tmp2 = r.Next(fw1, fw2);
                        textBox87.Text = tmp1.ToString() + "-" + tmp2.ToString();
                    }
                    else if (fhcheng.Checked == true)
                    {
                        Random r = new Random();
                        tmp1 = r.Next(fw1 + 10, fw2 + 10);
                        tmp2 = r.Next(fw1, fw2);
                        textBox87.Text = tmp1.ToString() + "*" + tmp2.ToString();
                    }
                }
                else
                {
                    MessageBox.Show("错误！");
                }
            }
        }

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