c#实现发送手机验证码

【.aspx.cs】

string shouji = "";
string templateid = "181ed0353b8341808620a1ed871793b5";

shouji = gelian.Value.Trim();
string yzm = IdentifyingCode.GenCode(4);
Boolean bret = SMSafd.sendSMS(shouji, templateid, yzm);

动态获取验证码：
public static string GenCode(int num)
{
string[] source = { "0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "A", "B", "C", "D", "E", "F", "G", "H", "I", "J", "K", "L", "M", "N", "O", "P,", "Q", "R", "S", "T", "U", "V", "W", "X", "Y", "Z" };
string code = "";

//获取验证码
for (int i = 0; i < num; i++)
{
code += source[rd.Next(0, source.Length)];

}
//返回产生的验证码
return code.Replace(",", "");
}

【common】

发送短信接口;
public class SMSafd
{
private static string key = "7d11838ff50e443d9023c0662bfaee14";
/// <summary>
/// 短信发送
/// </summary>
/// <param name="mobile">手机号</param>
/// <param name="templateid">模板ID</param>
/// <param name="smscontent">发送内容</param>
/// <returns></returns>
public static Boolean sendSMS(string mobile, string templateid, string smscontent)
{
Boolean bRet = false;
string retdata = "";
try
{
try
{
if (mobile.Length == 11)
{
string url = "http://v1.avatardata.cn/Sms/Send?key=" + key + "&mobile=" + mobile +
"&templateId=" + templateid + "&param=" + smscontent;
string ret = "";
WebClient client = new WebClient();
client.Encoding = System.Text.Encoding.GetEncoding("GB2312");
client.Headers.Add("Content-Type", "application/x-www-form-urlencoded");
// "geotable_id=98210&coord_type=3&ak=FT5VAs2fqymIEYoGBv0wqfOG";
string postString = url;
//string postString = "geotable_id=97335&coord_type=3&ak=yxdgG3XAEYdL2tva5CBbh7wC";
byte[] postData = Encoding.Default.GetBytes(postString);
byte[] responseData = client.UploadData(url, "POST", postData);
ret = Encoding.Default.GetString(responseData);
JObject jo = (JObject)JsonConvert.DeserializeObject(ret);
string ss = jo["success"].ToString();
if (ss == "True")
{
bRet = true;
//BaseDal.RecordError("手机号", mobile+"内容"+smscontent);

}
else
{
bRet = false;
retdata = "error:" + jo["reason"].ToString();
//BaseDal.RecordError("发送短信失败信息",retdata);
}
}
else
{
retdata = "error:客户电话不是手机号，不能发送短信！";
//BaseDal.RecordError("发送短信失败信息", retdata);
}
}
catch (Exception ex)
{
bRet = false;
//retdata = "error:" + this.tdal + ":" + "发送短信处理出错" + ":" + ex.Message;
}
//return retdata;

}
catch
{

}
return bRet;
}

}
}