25175 Asp.net non-refresh Chinese verification code implemented

I have found many articles about Chinese verification codes on the Internet before, but they have not been debugged successfully. The error always appears.

Thetarget'__Page'forthecallbackcouldnotbefoundordidnotimplementICallbackEventHandler cannot be returned by ICallbackEventHandler. I have corrected and sorted it out. Now I can realize the operation of Chinese verification code without refreshing. Now I will share the entire source code with you.

I hope this source code is just an introduction, and you can make modifications, such as changing the Chinese font library, font background noise, etc.

The default account password is 25175. The user login here is just an example of verification and has no other functions.