Huffman Algorithm, C#

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//Rextester.Program.Main is the entry point for your code. Don't change it.
//Compiler version 4.0.30319.17929 for Microsoft (R) .NET Framework 4.5

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text.RegularExpressions;

namespace Rextester
{
   public class Node
    {
        public char Symbol { get; set; }
        public int Frequency { get; set; }
        public Node Right { get; set; }
        public Node Left { get; set; }
 
        public List<bool> Traverse(char symbol, List<bool> data)
        {
            // Leaf
            if (Right == null && Left == null)
            {
                if (symbol.Equals(this.Symbol))
                {
                    return data;
                }
                else
                {
                    return null;
                }
            }
   
            
             else
            
            {   List<bool> left = null;
                List<bool> right = null;
 
                if (Left != null)
                {
                    List<bool> leftPath = new List<bool>();
                    leftPath.AddRange(data);
                    leftPath.Add(false);
 
                    left = Left.Traverse(symbol, leftPath);
                }
 
                if (Right != null)
                {
                    List<bool> rightPath = new List<bool>();
                    rightPath.AddRange(data);
                    rightPath.Add(true);
                    right = Right.Traverse(symbol, rightPath);
                }
 
                if (left != null)
                {
                    return left;
                }
                else
                {
                    return right;
                }
            }
        }
    }
}

Show compiler warnings [ + ] Show input
Compilation time: 0,12 sec, absolute running time: 0,11 sec, cpu time: 0,09 sec, average memory usage: 13 Mb, average nr of threads: 2, absolute service time: 0,24 sec