winform 多线程中ShowDialog()步骤无效的解决办法

private void Form1_Load(object sender, EventArgs e)
 
{
 
    Thread thread = new Thread(remind);
 
    thread.IsBackground = true;
 
    thread.Start();
 
}
 
private void remind()
 
{
 
   while (true)
 
   {
 
      string h = "";
 
      string m = "";
 
      if (h == DateTime.Now.Hour.ToString() && m == DateTime.Now.Minute.ToString() && DateTime.Now.Second.ToString() == "")
 
      {
 
          Form2 form2 = new Form2();
 
          form2.ShowDialog();
 
          Thread.Sleep();
 
      }
 
   }
 
}
 
form2的ShowDialog()显示并不是模式窗体,如何解决这种情况？？？

解决办法：

 Form2 form2 = new Form2();
 
 form2.ShowDialog(this);