public bool IsSnapToSketchEnabled {get; set;}

//Set snapping options via get/set options
var snapOptions = ArcGIS.Desktop.Mapping.Snapping.GetOptions(myMap);
//At 2.x - snapOptions.SnapToSketchEnabled = true;
snapOptions.IsSnapToSketchEnabled = true;
snapOptions.XYTolerance = 100;
//At 2.x - snapOptions.ZToleranceEnabled = true;
snapOptions.IsZToleranceEnabled = true;
snapOptions.ZTolerance = 0.6;

//turn on snap tip display parts
snapOptions.SnapTipDisplayParts = (int)SnapTipDisplayPart.SnapTipDisplayLayer + (int)SnapTipDisplayPart.SnapTipDisplayType;

//turn off all snaptips
//snapOptions.SnapTipDisplayParts = (int)SnapTipDisplayPart.SnapTipDisplayNone;

//turn on layer display only
//snapOptions.SnapTipDisplayParts = (int)SnapTipDisplayPart.SnapTipDisplayLayer;

//At 2.x - snapOptions.GeometricFeedbackColor = ColorFactory.Instance.RedRGB;
snapOptions.SnapTipColor = ColorFactory.Instance.RedRGB;

ArcGIS.Desktop.Mapping.Snapping.SetOptions(myMap, snapOptions);