public IMyLineChart changeSeriesLineColor(string _seriesTitle, string _hexColor) { MySolidColorBrush mySolidColorBrush = new MySolidColorBrush(); foreach (LineSeries aLineSeries in cartesianChart.Series) { if (aLineSeries.Title.Equals(_seriesTitle)) { aLineSeries.Stroke = mySolidColorBrush.convertFromHex(_hexColor); } } return(this); }