Passing Null to Represent a Default Value

Many GISDK functions interpret a null value for an argument to indicate that a default value should be used. For example, most GISDK functions that take a map name as an argument interpret null to mean the current map. The same applies to GISDK functions that take an editor name, a layout name, or a layer name. GISDK functions that affect display characteristics interpret null to mean "no change." For example, calling SetIconColor() on a selection set with a null value for the color indicates that the color of features in the set should not be changed from the default for the layer.