Help with strings and lists.

hello!

i´m  createing program , internally uses list < > instead of

an array. input come text box , should possible insert

 decimal numbers until user enters 0.0 input. then,

the highest , lowest , average printed out - button

making possible begin enter numbers again .

now problem. have completed, think, needed methods calculating highest, lowest , average.

my problem not know how continue!

thanks!

victor.

edit.

sorry swedish, here clarifications. medelvärde = average, högsta = highest, lägsta = lowest

namespace uppgift5._5 {     public partial class form1 : form     {          public form1()         {             initializecomponent();         }          private double medelvärde(list<int> lista)         {             int total = 0;             double average;              foreach (int resultat in lista)             {                 total += resultat;             }              average = (double)total / lista.count;             return average;         }          private double högsta(list<int> lista)         {             int högsta = lista[0];              (int index = 1; index < lista.count; index++)             {                 if (lista[index] > högsta)                 {                     högsta = lista[index];                 }             }             return högsta;         }          private double lägsta(list<int> lista)         {             int lägsta = lista[0];              (int index = 0; index < lista.count; index++)             {                 if (lista[index] < lägsta)                 {                     lägsta = lista[index];                 }             }             return lägsta;         }          private void button1_click(object sender, eventargs e)         {                      }     } }

why don't use linq aggregate functions query the list<t> and comeback results?

https://code.msdn.microsoft.com/101-linq-samples-3fb9811b

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