After assigning a key to a DLL to make it a strong name assembly, it cannot be compiled to the same location again. <BR>The VS.NET always shows <BR>"Could not copy temporary files to the output directory. <BR>The file 'xxx.dll' cannot be copied to the run directory. The process cannot access the file because it is being used by another process."<BR>and the DLL file is locked and cannot be deleted or overwritten.<BR>This is probably the effect of assigning the key but it is not what I want because my DLL will need frequent update.<BR><BR>Anybody can help me.............thx a lot!!!