double in engineering notation darstellen

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public static string ConvertToEngineering(double d)
    {
        string pattern = "#.##E0";
        
        if(d.Equals(0))
            return d.ToString(pattern);
      
        int Exponent = (int)Math.Floor(Math.Log10(Math.Abs(d)));
      
        switch (Exponent % 3)
        {
            case 1:
            case -2:
                pattern = "##.##E0";
                break;
            case 2:
            case -1:
                pattern = "###.##E0";
               break;
        }
        return d.ToString(pattern);
    }