An error occurred while using ajaxpro to interact with the session.

An error occurred while using ajaxpro:
Use ajaxpro to call the background CodeAn error occurs because the background code interacts with the session.

Error message:
"Session status can be used only when enablesessionstate is set to true in the configuration file or page command. Make sure thatProgramThe <configuration> \ <system. Web> \  
The solution is as follows: allow the session in Web. config and add
[Ajaxmethod (httpsessionstaterequirement. readwrite)] // read/write session:
Or
[Ajaxmethod (httpsessionstaterequirement. Read)] // read-only session: