Do not put pictures in the App_Data folder. The App_Data folder is a special place used for data sources and it is not meant to be used for pictures.
Move the Pictures folder to the root of your application instead (or within a folder in the root of the application) and you should be able to display the images.
Besides that, there is no "PictureBox" control in ASP.NET.
There is an
Image control that displays images.
Here is the ASP.NET Image control code to display an image with the name "myImage.gif" located in a folder called "Pictures" that is in the root director of your application:
-
<asp:Image id="theImage" runat="server" ImageUrl="Pictures/myImage.gif" AlternateText="My Image"/>
-Frinny