Question: I have upload control on my asp.net page. I upload pictures in folder cars and they show in windows explorer when I open that folder (cars), but in Visual Sudio they act like they not include in project ( that is the reason why they don't show on image control which point to some of them. What did I make wrong ?

Answer: 
If you have choosen a webSITE then it will allow this, but not if a webPROJECT is selected. 

I didn't find this on net, but I had two projects, and the one which was allowing me to show uploaded files was a website.
You have to click Refresh button. Also ensure that "Show all files" icon is selected. And finally, you will have to right click on the files and select Include in Project. That way it would become part of your project.

If I may ask, what exactly are you trying to achieve in your application? The reason I ask is, if there is an upload happening in your application, you shouldn't need to include the files in your project to refer to it from code.