fibonacci - Correction into the right direction C# -


so tried generate fibonacci algorithm in c# however, everytime run code getting error states:

the type or namespace name `ilist' not found. missing using directive or assembly reference?

i lost..where going wrong? thank you... 

public ilist<int> generatefibonacci(int toindex) {      ilist<int> sequence;      sequence.add(0);      sequence.add(1);       (int i=0; i<toindex; i++)      {          sequence.add(sequence[i], sequence[i+1]);      }       return sequence; }

i bet miss system.collections.generic, here correct version of program

using system; using system.collections.generic;   namespace consoleapplication2 {   public class program   {     public ilist<int> generatefibonacci(int toindex)     {        ilist<int> sequence = new list<int>();        sequence.add(0);        sequence.add(1);        (int = 0; < toindex; i++)       {          sequence.add(sequence[i]+ sequence[i + 1]);        }        return sequence;      }      static void main()     {       var s = generatefibonacci(10);            console.readkey();     }   } }

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