C# 窗体

private void button2_Click(object sender, EventArgs e)
        {
            Properties.Form_Challege form_Challege = new Properties.Form_Challege();
            //form_Challege.Parent= this;
            form_Challege.ShowDialog();//此处在form_Challege关闭之后才会执行Set()函数！！！！！！！！！！！！
            Set();
        }