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ATL Server Library Reference 
MAX_VARIABLE_VALUE_LENGTH 

This macro is defines the maximum size of session-state data values.


#define MAX_VARIABLE_VALUE_LENGTH

If necessary, you can define your own value for this symbol before including atlsession.h. This value affects database-backed session-state data only; it has no effect on the memory-based session-state implementation. By default, this symbol resolves to 1024.

Header: atlsession.h