16进制转换为2进制的方法

/// <summary>
        /// //16转2方法
        /// </summary>
        /// <param name="hexString"></param>
        /// <returns></returns>
        static string HexString2BinString(string hexString)
        {
            try
            {
                string result = string.Empty;
                foreach (char c in hexString)
                {
                    int v = Convert.ToInt32(c.ToString(), 16);
                    int v2 = int.Parse(Convert.ToString(v, 2));
                    // 去掉格式串中的空格，即可去掉每个4位二进制数之间的空格，
                    result += string.Format("{0:d4} ", v2);
                }
                return result.Replace(" ","");
            }
            catch (Exception ex)
            {
                Console.WriteLine(ex.Message);
                throw;
            }
        }