Cause is my side need to use the dahua camera DLL, the DLL should be written by c + +, initially in the console tests can be run normally, but I will use the DLL in the asp.net backend service page will be an error, error reason say is "trying to load the format is not correct procedure, (exception from HRESULT: 0 x8007000b)", web project has already been set up x86 properties, at the same time online the IIS application pool I also opens a 32-bit applications, but the error will appear,