.net core igGrid("saveChanges") synchronized ?

Is it possible to call $("#grid1").igGrid("saveChanges"); synchronized ?  Its looks like it is alway async even with a callback function like:

$("#grid1").igGrid("saveChanges", callBackFunction());

The async saveChanges cause problems in our application as we use session object between 2 action controller: the saveChanges action is not done before the second action is called and the state of the session is incorrect in the second action...

Please provide me an example of code how to call igGrid("saveChanges") synchronized with .Net core.