C＃：永远不会达到断点，并且Picturebox Image不会改变

Question

i was trying to add some kind of advent calender to my programm.
So i created a second form with the designer.
After clicking a toolstripmenuitem following gets executed.

private void OpenAdventCalender()
{
  if (fAdvent == null)
  {
       fAdvent = new Advent();
       fAdvent.FormClosed += new FormClosedEventHandler(fAdvent_FormClosed);
       AdventOptions[0] = "1";
       fAdvent.Visible = true;
   }
} 

Now that works fine. The Form does open and i can doubleclick picktureboxes.
On a doubleclick the image of the picturebox should change.
I tried it like that:

private void ShowAdventMessage(object sender, EventArgs e)
{
    if(false){}  //in original code i test on 24 days and pictureboxes
    else if ((DateTime.Today >= DateTime.Parse("01.12.2016")) && (sender == pictureBox1))
    {
        fForm1.AdventOptions[1] = "1";
        pictureBox1.Image.Dispose();
        pictureBox1.Image = null;
        pictureBox1.Image = Resources.p1;
        pictureBox1.Update();
        MessageBox.Show(fForm1.AdventList[0]);  //This Message pops up correctly
    }
}  

So the first big Problem is that the pictureBox1 does not change the image.
It also does not get deletet if i set the picturebox to null.
In the constructor im changing it the first time, there it works. Outside the constructor it does not work.

Now the second problem. I cannot debug in there. Breakpoints in the constructor or in any other function of my second form are never reached. Since i know that that Messagebox pops up i know it does reach the code.

When i hover over the breakpoint with my mouse, it told me:

The breakpoint cannot be reached at the moment. The code is differnt to the original version.

It also told me that i can change something in options to reach the breakpoints.
So i changed "Extras - Options - Debugging - General - Sourcefiles must be exactly like the original version = deactivated".
After that the breakpoints were still unreachable. Now the message from the breakpoint was:

The breakpoint cannot be reached at the moment. There is no executable code with the targetcodetype of the debugger connected with this line.

Does someone know how to debug in there?
Or does someone know what i am doing wrong so that the image does not change?

What i use if needed:
- Windows 10 professional 64bit
- Visual Studio 2015
- Resharper Ultimate

Thanks for any help.

Answer 1

After testing if i also cannot debug a complete newly created form, i compiled it fully through project explorer. After that it worked.