How to print which choice (of "Open"/"High"/"Low"/"Close") was set in a parameter of type DataSeries

For most of the 8 cBot parameter types it is obvious how to print the value that was input - for int, double, bool, enum, string etc - but seemingly not for a parameter of type DataSeries, such as 

        [Parameter("Data Source", Group = "Moving Averages")]
       public DataSeries Price { get; set; }
 
I have not been able to print the choice that was input (not the series of values, but the ‘name’ that was input, the “High” or “Close” etc). How is it done?