Cleanup() returns null

Question

I have a C# code that integrates with Sage 100 2021 Standard. 
 After performing some action I want to clean and close the session I opened. for this I'm using: 
 session.nCleanup();
session.DropObject(); 
 for some reason the nCleanup() returns null instead of 0 as it says in here: 
 
 (taken from https://help-sage100.na.sage.com/2022/FLOR/index.htm#Object_Reference/BaseSystem/SY_Session.htm?Highlight=sy_session ) 
 after cleanup() the value of sLastErrorMsg is empty, meaning there was no error, and after calling DropObject() I see in Master Console in Sage that the task was terminated. 
 
 Does anyone knows why it returns null and not 0?

Russell Libby · Accepted Answer

There is actually no RETURN value/expression from the Cleanup method in SY_Session, so the null value when called externally is correct. As to the documentation discrepancy, its based on calling this method from ProvideX. In ProvideX a method will always return a value, even if a method ends with just a RETURN (which will return a 0, or empty string if the method is postfixed with a $). 
 Hope this helps. Russell

Sage 100

Cleanup() returns null

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