can't solve challenge 1 of 1

Challenge Task 1 of 1

Add a GetHashCode method to the VocabularyWord class that returns an appropriate hash code. Important: In each task of this code challenge, the code you write should be added to the code from the previous task. Restart Preview Get Help Check Work VocabularyWord.cs

1 using System; 2 namespace Treehouse.CodeChallenges 3 { 4 public class VocabularyWord 5 { 6 public string Word { get; private set; } 7 ​ 8 public VocabularyWord(string word) 9 { 10 Word = word; 11 } 12 ​ 13 public override string ToString() 14 { 15 return Word; 16 } 17 ​ 18 public override bool Equals(object obj) 19 { 20 if(!(obj is VocabularyWord)) 21 { 22 return false; 23 } 24 ​ 25 var that = obj as VocabularyWord; 26 ​ 27 return this.Word.Equals(that.Word); 28 } 29 } 30 } 31 ​

using System;
namespace Treehouse.CodeChallenges
{
    public class VocabularyWord
    {
        public string Word { get; private set; }

        public VocabularyWord(string word)
        {
            Word = word;
        }

        public override string ToString()
        {
            return Word;
        }

        public override bool Equals(object obj)
        {
            if(!(obj is VocabularyWord))
            {
                return false;
            }

            var that = obj as VocabularyWord;

            return this.Word.Equals(that.Word);
        }
    }
}