use class file in web form

Hi, You can arrange your code in such nice way so please create approprite folder structer for your code i.e. if you are working in web forms then you can seperate your classes in one folder and then you can refer that path in your namespace. If you have folder name with domainclasses->yourclassname then where you want to use this class then top of namespace domainclasses.Yourclassname

App_Code is a specialized folder and there are multiple reasons causing this folder may be locked or causing some issues. As a testiing purpose can you move "BL (Folder) ->customer.cs" from out of App_Code and put directly under  project scope and then try to access? This is to confirm that some external library causing App_Code issues.

Could you pleaseshare more details on this and folder structer then member can hel you ?