Before you deploy a .NET Web Forms project, make sure you
add all picture files used by the application to the resource file
list for the project.

Resource files might not be accessible if you change the default
value for the initial current directory of the virtual file system
for the Web Forms project. The default value in the .NET Web Forms
Application wizard is the current target path. Modifying the PBCurrentDirectory
global property in the project�s ASP.NET configuration
settings or directly in the Web.config file
might also make the resource files inaccessible.