/// <summary>
    /// ASCII 幫助類
    /// </summary>
    public static class ASCIIHelper
    {
        /// <summary>
        /// 含中文字串轉ASCII
        /// </summary>
        /// <param name="str"></param>
        /// <returns></returns>
        public static string Str2ASCII(String str)
        {
            
 
//這裡我們將採用2位元組一個漢字的方法來取出漢字的16進位制碼
            byte[] textbuf = Encoding.Default.GetBytes(str);
            //用來儲存轉換過後的ASCII碼
            string textAscii = string.Empty;

            for (int i = 0; i < textbuf.Length; i++)
            {
                textAscii += textbuf[i].ToString("X");
            }
            
 
return textAscii;
        }

        /// <summary>
        /// ASCII轉含中文字串
        /// </summary>
        /// <param name="textAscii">ASCII字串</param>
        /// <returns></returns>
        public static string ASCII2Str(string textAscii)
        {

            int k = 0;//位元組移動偏移量
            byte
 
[] buffer = new byte[textAscii.Length / 2];//儲存變數的位元組
            for (int i = 0; i < textAscii.Length / 2; i++)
            {
                //每兩位合併成為一個位元組
                buffer[i] = byte.Parse(textAscii.Substring(k, 2), System.Globalization.NumberStyles.HexNumber);
                k = k + 2;
            }
            //將位元組轉化成漢字
            return Encoding.Default.GetString(buffer);
        }
    }