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發送短信的內容，整體做用urlencode。短信的格式為：【簽名】放在內容的最前方。
示范：【創信信息】您本次注冊的驗證碼是：888888，
其中簽名可根據自己公司的名稱或簡稱自定義，字數為2-8字，不可以是純數字，電話號碼或者網址，不可以是無意義的簽名，比如【大家好】;【哈哈哈】;【提示】;【測試】等
正確示例：【創信信息】，【京東】，【百度】，【工商銀行】
錯誤示例：【你好】，【通知】，【測試一下】，【哈哈哈】，【123123】

public string send_sms()
{
string str_userid = "ID"
string str_account = "賬號"
string str_password = "密碼"
string str_content = "內容"
string str_mobile = "手機號碼"//130xxxxxxxx,131xxxxxxxx多個號碼用英文半角分隔

string param = string.Format(@"action=send&rt=json&userid={0}&account={1}&password={2}&content={3}&mobile={4}", str_userid, str_account, str_password, str_content, str_mobile);
string url = "http://dc.28inter.com/sms.aspx"
Response.Write(PostSend(url, param));//輸出返回值
}

private string PostSend(string url, string postdate)
{
HttpWebRequest myHttpWebRequest = (HttpWebRequest)WebRequest.Create(url);
myHttpWebRequest.ContentType = "application/x-www-form-urlencoded;charset=UTF-8"
myHttpWebRequest.Method = "POST"
Stream myRequestStream = myHttpWebRequest.GetRequestStream();
StreamWriter myStreamWriter = new StreamWriter(myRequestStream);
myStreamWriter.Write(postdate);
myStreamWriter.Flush();
myStreamWriter.Close();
myRequestStream.Close();

HttpWebResponse myHttpWebResponse = (HttpWebResponse)myHttpWebRequest.GetResponse();
Stream myResponseStream = myHttpWebResponse.GetResponseStream();
StreamReader myStreamReader = new StreamReader(myResponseStream, Encoding.GetEncoding("utf-8"));
String outdata = myStreamReader.ReadToEnd();
myStreamReader.Close();
myResponseStream.Close();
return outdata;
}