比较两个ArrayList是否相同

bool getIsStringsEqual(ArrayList str1, ArrayList str2)
        {
            if(str1.Count==str2.Count)
            {
                foreach (object str in str1)
                {
                    if (!str2.Contains(str))
                        return false;
                 }

              foreach (object str3 in str2)
                {
                    if (!str1.Contains(str3))
                        return false;
                }
                return true; 

            }
            else
                return false;
          
        }