About using the progress bar in Visual Studio

Question

I want to add a progress bar to my Winforms project, but I have a problem.

In this case it won't close after 2 seconds

    private void button1_Click(object sender, EventArgs e)
    {
        Form1 form1 = new Form1();
        form1.ShowDialog();
        System.Threading.Thread.Sleep(2000);
        form1.Close();
    }

In this case the progress bar will not move

    private void button1_Click(object sender, EventArgs e)
    {
        Form1 form1 = new Form1();
        form1.Show();
        System.Threading.Thread.Sleep(2000);
        form1.Close();
    }

May I ask how to solve this problem? Or is there a better progress bar plug-in in Visual Studio?

Answer 1

jmcilhinney has already explained it very clearly, you need to understand the threading issues well.

Here is a method that does not need to use a timer, please refer to the following code:

         Form2 form2 = new Form2();
         Task.Factory.StartNew(() =>
         {
             form2.ShowDialog();
         });

         this.Invoke(new Action(() =>
         {
             if (form2 != null)
             {
                 System.Threading.Thread.Sleep(2000);
                 form2.Close();
                 form2.Dispose();
                 form2 = null;
             }
         }));