CreateNull
CDocBuilderValue^ CreateNull();
Creates a null value, an analogue of null in JS.
Please note, that for the .docbuilder file the CDocBuilderContext.CreateNull method is not used.
Example
.Net
string workDirectory = "C:/Program Files/ONLYOFFICE/DocumentBuilder";
CDocBuilder.Initialize(workDirectory);
CDocBuilder oBuilder = new CDocBuilder();
CContext oContext = oBuilder.GetContext();
CValue oNull = oContext.CreateNull();
CDocBuilder.Destroy();