It is not necessary to call this method in order to end the current paragraph, it is also automatically ended by a call to C1.C1Preview.C1PrintDocument.RenderInlineBegin or any of the RenderBlock... or RenderDirect... methods.
This method can only be used between calls to C1.C1Preview.C1PrintDocument.StartDoc and C1.C1Preview.C1PrintDocument.EndDoc methods on the current document. For details, see C1.C1Preview.C1PrintDocument.RenderBlock.