at vs2008 i could set App_Code folder, but at vs2010 i can not do it, that's why i put my dataset's and class' to App_Data folder. Either I do not know even App_Data folder is secure? Any suggestions?
Thanks
Remember, that Web Site Project can contain App_Code folder and Web Application Project can't! Because all project is for code.
If you want to use standalone class files (in "App_Code" dir) in VS 2010 project, be sure set the File Properties > Build Action for each *.cs or *.vb file to "Compile" in the Properties > Advanced dialog.
Also, use the same namespace as your project and these standalone classes will be readily available to the rest of your project.
Took me a bit to realize the default setting in my VS was "Content" instead of "Compile."
Workaround:
If we are using App_Code in a web application project, we need to rename into any other folder name.