public enum ClassificationMethod : System.Enum, System.IComparable, System.IConvertible, System.IFormattable  

await QueuedTask.Run(() =>
{
  var featureLayerCreationParams = new FeatureLayerCreationParams(new Uri(@"c:\data\countydata.gdb\counties"))
  {
    Name = "Population Density (sq mi) Year 2010",
    RendererDefinition = new GraduatedColorsRendererDefinition("POP10_SQMI")
  };
  LayerFactory.Instance.CreateLayer<FeatureLayer>(
    featureLayerCreationParams,
    MapView.Active.Map
  );
});

string colorBrewerSchemesName = "ColorBrewer Schemes (RGB)";
StyleProjectItem style = Project.Current.GetItems<StyleProjectItem>().First(s => s.Name == colorBrewerSchemesName);
string colorRampName = "Greens (Continuous)";
IList<ColorRampStyleItem> colorRampList = await QueuedTask.Run(() =>
{
  return style.SearchColorRamps(colorRampName);
});
ColorRampStyleItem colorRamp = colorRampList[0];

await QueuedTask.Run(() =>
{
  GraduatedColorsRendererDefinition gcDef = new GraduatedColorsRendererDefinition()
  {
    ClassificationField = "CROP_ACR07",
    ClassificationMethod = ArcGIS.Core.CIM.ClassificationMethod.NaturalBreaks,
    BreakCount = 6,
    ColorRamp = colorRamp.ColorRamp,
    SymbolTemplate = SymbolFactory.Instance.ConstructPolygonSymbol(
                            ColorFactory.Instance.GreenRGB, SimpleFillStyle.Solid, null).MakeSymbolReference(),
    ExclusionClause = "CROP_ACR07 = -99",
    ExclusionSymbol = SymbolFactory.Instance.ConstructPolygonSymbol(
                            ColorFactory.Instance.RedRGB, SimpleFillStyle.Solid, null).MakeSymbolReference(),
    ExclusionLabel = "No yield",
  };
  var featureLayerCreationParams = new FeatureLayerCreationParams((new Uri(@"c:\Data\CountyData.gdb\Counties")))
  {
    Name = "Crop",
    RendererDefinition = gcDef
  };
  LayerFactory.Instance.CreateLayer<FeatureLayer>(featureLayerCreationParams, MapView.Active.Map);
});

// applies to TIN layers only

var defiendIntervalNodeRendererDef = new TinNodeClassBreaksRendererDefinition();
defiendIntervalNodeRendererDef.ClassificationMethod = ClassificationMethod.DefinedInterval;
defiendIntervalNodeRendererDef.IntervalSize = 4;
defiendIntervalNodeRendererDef.SymbolTemplate = nodeSymbol.MakeSymbolReference();

if (tinLayer.CanCreateRenderer(defiendIntervalNodeRendererDef))
{
  CIMTinRenderer renderer = tinLayer.CreateRenderer(defiendIntervalNodeRendererDef);
  if (tinLayer.CanSetRenderer(renderer, SurfaceRendererTarget.Edges))
    tinLayer.SetRenderer(renderer, SurfaceRendererTarget.Edges);
}

// applies to TIN layers only

var stdDevNodeRendererDef = new TinNodeClassBreaksRendererDefinition();
stdDevNodeRendererDef.ClassificationMethod = ClassificationMethod.StandardDeviation;
stdDevNodeRendererDef.DeviationInterval = StandardDeviationInterval.OneHalf;
stdDevNodeRendererDef.ColorRamp = ColorFactory.Instance.GetColorRamp("Cyan to Purple");

if (tinLayer.CanCreateRenderer(stdDevNodeRendererDef))
{
  CIMTinRenderer renderer = tinLayer.CreateRenderer(stdDevNodeRendererDef);
  if (tinLayer.CanSetRenderer(renderer, SurfaceRendererTarget.Edges))
    tinLayer.SetRenderer(renderer, SurfaceRendererTarget.Edges);
}

var slopeFaceClassBreaksQuantile = new TinFaceClassBreaksRendererDefinition(TerrainDrawCursorType.FaceSlope);
slopeFaceClassBreaksQuantile.ClassificationMethod = ClassificationMethod.Quantile;
// accept default breakCount, symbolTemplate, color ramp

if (surfaceLayer.CanCreateRenderer(slopeFaceClassBreaksQuantile))
{
  CIMTinRenderer renderer = surfaceLayer.CreateRenderer(slopeFaceClassBreaksQuantile);
  if (surfaceLayer.CanSetRenderer(renderer, SurfaceRendererTarget.Surface))
    surfaceLayer.SetRenderer(renderer, SurfaceRendererTarget.Surface);
}

// applies to LAS dataset layers only

var lasPointsClassBreaksRendererDef = new LasPointClassBreaksRendererDefinition();
lasPointsClassBreaksRendererDef.ClassificationMethod = ClassificationMethod.NaturalBreaks;
lasPointsClassBreaksRendererDef.ModulateUsingIntensity = true;
// increase the symbol size by a factor
lasPointsClassBreaksRendererDef.SymbolScaleFactor = 1.0;

if (lasDatasetLayer.CanCreateRenderer(lasPointsClassBreaksRendererDef))
{
  CIMTinRenderer renderer = lasDatasetLayer.CreateRenderer(lasPointsClassBreaksRendererDef);
  if (lasDatasetLayer.CanSetRenderer(renderer, SurfaceRendererTarget.Points))
    lasDatasetLayer.SetRenderer(renderer, SurfaceRendererTarget.Points);
}