https://resources.arcgis.com/en/help/arcobjects-net/componentHelp/0012/001200000116000000.htm
IACLabelRenderer.HowManyLabels Property (ArcObjects .NET 10.1 SDK)
propertysdk
https://resources.arcgis.com/en/help/arcobjects-net/componentHelp/0012/001200000119000000.htm
IACLabelRenderer.LabelProperties Property (ArcObjects .NET 10.1 SDK)
propertysdk
https://resources.arcgis.com/en/help/arcobjects-net/componentHelp/0012/00120000011m000000.htm
IACLabelRenderer.LabelSymbol Property (ArcObjects .NET 10.1 SDK)
propertysdk