XML : find the highest value in multiple xml files and display them

i have this xml file: (its a draft and got multiple ones like this)

  <?xml version="1.0" encoding="UTF-8" ?>  <Car>    <Location name = "somewhere">     <Type type="itstype">         <Color>Blue</Blue>         <Owner>Bill</Owner>         <Price>135</Price>     </Type>         <Type type="itstype">        <Color>Red</Blue>        <Owner>John</Owner>        <Price>250</Price>     </Type>    </Location>  </Car>      

and I want using C# to read through all the xml files(which this I can do) and find the highest price for each car in each xml file and display them on the screen. Some xml files have more than two cars. I tried using this but it only displays the highest price on the last xml file it reads.

  public List<Cars> carHighestPrice (string carsname)       {          var highest = from hv in locations                        from HV in hv.cars                        orderby HV.votes                         where hv.locationName == carsName                        select HV;          return highest.ToList();      }    

this is the method I am using to display them

   public void DisplayHighestPrices()      {          string str = "";          foreach (var highest in locationList.locations)          {             str = locationList.carHighestPrice (highest.locationName).Last() + Environment.NewLine;            }          lbl1.Text = str;      }    

any ideas on how to fix that please?