C#
Post.aspx
                	<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Post.aspx.cs" Inherits="Post" %>
                	<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
                	<html xmlns="http://www.w3.org/1999/xhtml" >
                	<head runat="server">
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>云信互联DEMO</title>
</head>
<body>
<form id="form1" runat="server">
<div>
<table bordercolor="#dcdcdc" cellpadding="4" cellspacing="0" frame="box" rules="none"
style="border-collapse: collapse">
<tr>
<td background="#dcdcdc" class="frmHeader" style="border-right: white 2px solid">参数</td>
<td background="#dcdcdc" class="frmHeader">值</td>
</tr>
<tr>
<td class="frmText" style="font-weight: normal; color: #000000">account:</td>
<td><asp:TextBox CssClass="frmInput" Id="Txtaccount" runat="server"  Width="272px" /></td>
</tr>
<tr>
<td class="frmText" style="font-weight: normal; color: #000000">password:</td>
<td><asp:TextBox  CssClass="frmInput" id="Txtpassword" runat="server"  Width="272px" /></td>
</tr>
<tr>
<td class="frmText" style="font-weight: normal; color: #000000">phone:</td>
<td>
<asp:TextBox  CssClass="frmInput" id="Txtmobile" runat="server" name="scorpid" Width="272px" /></td>
</tr>
<tr>
<td class="frmText" style="font-weight: normal; color: #000000">msg:</td>
<td>
<asp:TextBox  CssClass="frmInput" id="Txtcontent" runat="server" name="sprdid" Width="272px" /></td>
</tr>
<tr> 
<td></td> 
<td align="center"><asp:Button ID="ButSubmit" runat="server" Text="提交" OnClick="ButSubmit_Click" /></td>
</tr>
<tr> 
<td></td> 
<td align="center"><asp:Label ID="LabelRetMsg" runat="server"></asp:Label></td>
</tr>
</table>
</div>
</form>
</body>
</html>
Post.aspx.cs
using System;
               	  	  using System.Security.Cryptography;
               	  	  using System.Data;
               	  	  using System.Configuration;
               	  	  using System.Collections;
               	  	  using System.IO;
               	  	  using System.Net;
               	  	  using System.Text;
               	  	  using System.Web;
               	  	  using System.Web.Security;
               	  	  using System.Web.UI;
               	  	  using System.Web.UI.WebControls;
               	  	  using System.Web.UI.WebControls.WebParts;
               	  	  using System.Web.UI.HtmlControls;
               	  	  using System.Security.Cryptography.X509Certificates;
           	  	    using System.Net.Security;
public partial class Post : System.Web.UI.Page
               	  	  {
               	  	  public static string PostUrl = ""; 
               	  	  protected void Page_Load(object sender, EventArgs e)
               	  	  {
 }
               	  	  protected void ButSubmit_Click(object sender, EventArgs e)
               	  	  {
               	  	  string un = this.Txtaccount.Text.Trim();
               	  	  string pw = this.Txtpassword.Text.Trim();
               	  	  pw= getMd5Hash(pw);
               	  	  string phone = Txtmobile.Text.Trim();
               	  	  string content =Txtcontent.Text.Trim();
               	  	  string url = "https://u.smsyun.cc/sms-partner/access/"+un+"/sendsms";
               	  	  string data="{"smstype":"4","clientid":""+un+"","password":""+pw+"","mobile":""+phone+"","content":""+content+"","sendtime":""+DateTime.Now.Date.ToString()+"","extend":"00","uid":"00"}";
               	  	  string result = doPostMethodToObj(url, data); //调用POST方式
 LabelRetMsg.Text = result+"<br>code===0代表发送成功";
               	  	  }
 //POST方式接口
               	  	  public static string doPostMethodToObj(string url, string data)   {
 string result = String.Empty;
               	  	  HttpWebRequest httpWebRequest = (HttpWebRequest)WebRequest.Create(url);
               	  	  httpWebRequest.ContentType = "application/json; charset=utf-8";
 httpWebRequest.Method = "POST"; 
 using (StreamWriter streamWriter = new StreamWriter(httpWebRequest.GetRequestStream()))
               	  	  {
               	  	  streamWriter.Write(data);
               	  	  streamWriter.Flush();
               	  	  streamWriter.Close();
               	  	  HttpWebResponse httpResponse = (HttpWebResponse)httpWebRequest.GetResponse();
               	  	  using (StreamReader streamReader = new StreamReader(httpResponse.GetResponseStream(), Encoding.GetEncoding("utf-8")))
               	  	  {
               	  	  result = streamReader.ReadToEnd();
               	  	  }
               	  	  }
               	  	  return result;
               	  	  }
 // md5加密
               	  	  public static?string?getMd5Hash(string?input)
               	  	  {
               	  	  //?Create?a?new?instance?of?the?MD5CryptoServiceProvider?object.
               	  	  MD5?md5Hasher?=?MD5.Create();
????????//?Convert?the?input?string?to?a?byte?array?and?compute?the?hash.
               	  	  byte[]?data?=?md5Hasher.ComputeHash(Encoding.Default.GetBytes(input));
????????//?Create?a?new?Stringbuilder?to?collect?the?bytes
               	  	  //?and?create?a?string.
               	  	  StringBuilder?sBuilder?=?new?StringBuilder();
????????//?Loop?through?each?byte?of?the?hashed?data?
               	  	  //?and?format?each?one?as?a?hexadecimal?string.
               	  	  for?(int?i?=?0;?i?<?data.Length;?i++)
               	  	  {
               	  	  sBuilder.Append(data[i].ToString("x2"));
               	  	  }
????????//?Return?the?hexadecimal?string.
               	  	  return?sBuilder.ToString();
               	  	  }
}
Web.Config
<?xml version="1.0"?>
                      <!-- 
注意: 除了手动编辑此文件以外,您还可以使用 
Web 管理工具来配置应用程序的设置。可以使用 Visual Studio 中的
“网站”->“Asp.Net 配置”选项。
设置和注释的完整列表在 
machine.config.comments 中,该文件通常位于 
\Windows\Microsoft.Net\Framework\v2.x\Config 中
WebReference.Service.PostUrl 短信发送接口
WebReference.Service.BalanceQueryUrl 获取余额接口
-->
<configuration>
<appSettings>
<add key="WebReference.Service.PostUrl" value="https://u.smsyun.cc/sms-partner/access/{您的账号}/sendsms"/>
</appSettings>
<connectionStrings/>
<system.web>
<!-- 
设置 compilation debug="true" 将调试符号插入
已编译的页面中。但由于这会 
影响性能,因此只在开发过程中将此值 
设置为 true。
-->
<compilation debug="true"/>
<!--
通过 <authentication> 节可以配置 ASP.NET 使用的 
安全身份验证模式,
以标识传入的用户。 
-->
<!-- <authentication mode="Windows"/> -->
<!--
如果在执行请求的过程中出现未处理的错误,
则通过 <customErrors> 节可以配置相应的处理步骤。具体说来,
开发人员通过该节可以配置
要显示的 html 错误页
以代替错误堆栈跟踪。
 <customErrors mode="RemoteOnly" defaultRedirect="GenericErrorPage.htm">
  <error statusCode="403" redirect="NoAccess.htm" />
  <error statusCode="404" redirect="FileNotFound.htm" />
  </customErrors>
                      -->
  </system.web>
  </configuration>