private void button3_Click(object sender, EventArgs e)
{
Form_pop form_Pop = new Form_pop();
form_Pop.Show();
form_Pop.radioButton2.Checked = true;
}
private void button2_Click(object sender, EventArgs e)
{
Form_pop form_Pop = new Form_pop();
form_Pop.Show();
//https://www.cnblogs.com/tommy-huang/p/4539999.html
//at the beginning, I use showdialogue but failed to execute the next sentence; actually the next sentence will not run untill the window was closed
//button3_click is the same
form_Pop.radioButton1.Checked = true;
}