How to programmatically change the dimension of the intervals

[VladimirPerpeta]

In manual mode, change the dimension of this is elementary . ITable of layer "Layer1" contains the columns of "measurement.csv", which were added by the operation of JOIN. My custom render (on the basis of NaturalBreaks) references a column "measurement.csv.%". How to programmatically (better С#) change the dimension of the indicators? What objects and attributes needed for this? I am working with ArcObjects in C#.