Asp.net is not supporting dll files of Biometrics Attendence Machine's SDK

I have ZK Teco Bio-metrics Attendance device. I need to integrate this device with my Asp.net project, so my team can remotely access the machine to check their attendance records. I have downloaded Official SDK and add references in my project and have gone through with the registry process to make device connection but I can't make the connection and getting this error:

"Retrieving the COM class factory for component with CLSID {00853A19-BD51-419B-9269-2DABE57EB61F} failed due to the following error: 800700c1 is not a valid Win32 application. (Exception from HRESULT: 0x800700C1)."

However, I have successfully connected the device with my C# Windows Form project (Desktop Application) and can use all functionalities of the same SDK.

What should I do to connect the device with my Asp.net project?

There are two possible reason for this error.

First reason

The ZK Techo SDK dlls are not registered under your windows 32 bit directory

Solution:

TO register the ZK dll under windows 32 bit directory

Step 1

Download the latest version of ZK SDK from the ZKTeco website

Step 2

Extract the downloaded folder and open it. It contains “SDK-Ver*\32bit\” folder open it and copy all the file under 32 bit folder *is the available version number

Step 3

Paste all the copied files under windows 32 bit directory folder The most common path of windows 32 directory folder is “C:\Windows\System32\”

Step 4 (Register ZK 32 bit SDK)

The files you Just copied and pasted into windows 32 bit directory folder contains a file name “Register_SDK_x86.bat” run it as Administrator and wait until the ZK SDK dll are registered it usually take 2 -3 minutes.

Second Reason

Change the target platform of your Web Application from Any CPU to x86.

Right click on your project name in visual studio solution explorer go to properties -> Build -> under general you can find Platform target change it to Any CPU to x86. Build your web application and publish it. Hopefully your problem shall be solved.