I have renamed the default namespace in the files

But it cann't get the "**.WebModules.FileManager.Web.BrowseFiles" class at the BrowseFiles.aspx

It can't find the "AccountsTool" in the namespace "**.WebModules.Data" at the AccountsTool.cs of the AccountBusiness module. the same with the permission,dataPermission,Role,User and so on.

Doesn't it inherit the namespace from the Core class?

I have referenced the AccountsData module with the Core module before rebuild the assembly

I have doubt with the files in the bin folder of the AccountsData module. Are they created by the programmer? or they are created by the machine. I try to rename the Dll Files but receive the same questions. I saw the code but i don't know when i open it with vs studio.

who can tell me how to assembly the module without the namespace errors?
How to compile the Dll files?

I'm guessing your DLLs were made before you renamed the namespace. The DLLs probably have metadata that has the old namespace (you could check this with ildasm).

You should make a backup of your whole directory tree, then delete the .dll and .pdb files. Rebuild the project - it will fail the first time, but it probably makes you a new DLL that you can set a reference to in the other projects. Keep doing builds and fixing references until the whole thing builds cleanly.

Eric