取出两个数组中不同的部分

我们知道取出两个数组中相等的部分，很容易，只要判断相等就行了。那么怎样去除两个数组中不相等的部分呢？
看代码：

using System;
using System.Collections;
using System.Text;

namespace CharOperate
{
    class Program
    {
        static void Main()
        {
            string[] strraw ={ "29", "34", "89" };
            string[] strnow ={ "29", "20", "23" };
            ArrayList rest = new ArrayList();
            for (int i = 0; i < strraw.Length; i++)
            {
                for (int j = 0; j < strnow.Length; j++)
                {
                    if (strraw[i] == strnow[j])
                    {
                        goto lhking;
                    }
                    else
                    {
                        if (j == strnow.Length - 1)
                        {
                            rest.Add(strraw[i]);
                        }
                    }
                }
            lhking: ;
            }
            for (int i = 0; i < strnow.Length; i++)
            {
                for (int j = 0; j < strraw.Length; j++)
                {
                    if (strnow[i] ==strraw [j])
                    {
                        goto lhking;
                    }
                    else
                    {
                        if (j == strraw.Length - 1)
                        {
                            rest.Add(strnow[i]);
                        }
                    }
                }
            lhking: ;
            }
            foreach (string str in rest)
            {
                Console.Write(str + "  ");
            }
            Console.Read();
        }
    }
}

以上的goto可以语句，可以换成break