Session usage experience (2)

For example, if you jump to the page2 page from the page1 page and assign a value to the session, the session value is blank at this time (in fact, after the jump, the next sentence in the jump statement assigns a value to the session ).CodeNo execution, and the session is null ). When the session value is called on the page2 page, the "system. nullreferenceexception: the object reference is not set to the instance of the object" is thrown. The solution is simple, that is, assign a value to the session before the jump. The session value is used for other pages after the jump, but the session on page1 is not instantiated at this time, so the above error is thrown.