ASP.NET Post方式提交

public static string SendMsg(string fxPhone, string fxPassword, string toPhone, string msg)
{
try
{
string url = "u=" + fxPhone + "&";
url = url + "p=";
url = url + fxPassword + "&";
url = url + "to=";
url = url + toPhone + "&";
url = url + "m=" + msg;

string formUrl = "http://quanapi.sinaapp.com/fetion.php";
string formData = url;                               //提交的参数

//注意提交的编码 这边是需要改变的 这边默认的是Default：系统当前编码
byte[] postData = Encoding.UTF8.GetBytes(formData);

// 设置提交的相关参数
HttpWebRequest request = WebRequest.Create(formUrl) as HttpWebRequest;
Encoding myEncoding = Encoding.UTF8;
request.Method = "POST";
request.KeepAlive = false;
request.AllowAutoRedirect = true;
request.ContentType = "application/x-www-form-urlencoded";
request.UserAgent = "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; .NET CLR 2.0.50727; .NET CLR  3.0.04506.648; .NET CLR 3.5.21022; .NET CLR 3.0.4506.2152; .NET CLR 3.5.30729)";
request.ContentLength = postData.Length;

// 提交请求数据
System.IO.Stream outputStream = request.GetRequestStream();
outputStream.Write(postData, 0, postData.Length);
outputStream.Close();

HttpWebResponse response;
Stream responseStream;
StreamReader reader;
string srcString;
response = request.GetResponse() as HttpWebResponse;
responseStream = response.GetResponseStream();
reader = new System.IO.StreamReader(responseStream, Encoding.GetEncoding("UTF-8"));
srcString = reader.ReadToEnd();
string result = srcString;   //返回值赋值
reader.Close();
return result;
}
catch
{
return "error";
}
}