如果循环有问题

我的问题是，我的程序在这里有麻烦在button21的函数之间循环，这取决于if语句的顺序，if函数工作，但另一个不会。在下面的代码中，我将其设置为button2，但我希望按钮1和2都与button21一起工作，如果他们被选中。然而，函数设置qw==1在这个程序中起作用，而不是qw==2那么，我的程序代码有什么问题呢?显示代码:

namespace Matematisk_indlæring
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        Random RND = new Random(Guid.NewGuid().GetHashCode());
        Random RND2 = new Random(Guid.NewGuid().GetHashCode());
        private void quitToolStripMenuItem_Click(object sender, EventArgs e)
        {
            this.Close();
        }
        private void button1_Click(object sender, EventArgs e)
        {
            button1.Hide(); 
            button2.Hide();
            button3.Hide();
            button4.Hide();
            button5.Hide();
            label1.Show();
            textBox1.Show();
            button21.Show();
            double qw = 1;
            textBox2.Text = qw.ToString();
            string q = "1+1";
            label1.Text = q;
            int qq = 1 + 1;
            textBox3.Text = qq.ToString();
        }

        private void button21_Click(object sender, EventArgs e)
        {
            double qqq = Convert.ToDouble(textBox1.Text);
            double qq = Convert.ToDouble(textBox3.Text);
            int qw = Convert.ToInt32(textBox2.Text);
            if (qw == 1)
            {
                if (qq == qqq)
                {
                    MessageBox.Show("succes");
                    int qws1;
                    int qws;
                    qws1 = RND2.Next(51, 100);

                    qws = RND.Next(0, 50);
                    qq = qws1 + qws;
                    textBox3.Text = qq.ToString();
                    string tese = qws.ToString();
                    string tese2 = qws1.ToString();
                    label1.Text = tese2 + "+" + tese;
                }
                    if (qw == 2)
                    {
                        if (qq == qqq)
                        {
                            MessageBox.Show("succes");
                            int qws1;
                            int qws;
                            qws1 = RND2.Next(51, 100);

                            qws = RND.Next(0, 50);
                            qq = qws1 - qws;
                            textBox3.Text = qq.ToString();
                            string tese = qws.ToString();
                            string tese2 = qws1.ToString();
                            label1.Text = tese2 + "-" + tese;
                        }


                }
            }
        }
        private void button2_Click(object sender, EventArgs e)
        {
            button1.Hide();
            button2.Hide();
            button3.Hide();
            button4.Hide();
            button5.Hide();
            label1.Show();
            textBox1.Show();
            button21.Show();
            double qw = 2;
            textBox2.Text = qw.ToString();
              string q = "1-1";
                label1.Text = q;
                int qq = 1 - 1;
                textBox3.Text = qq.ToString();
        }
    }
}