The clientState property (object) stores custom data that is serialized and sent to the server with every callback request.
This only applies to ASP.NET WebForms, ASP.NET MVC and Java versions.
DayPilot.Calendar.clientState{}Custom object that will be serialized and send to the server with every CallBack request. It's available on the server side as ClientState property.
dpc.clientState.filter = 'my filter';ClientState [doc.daypilot.org]