C#post http传输数据

 System.IO.Stream s = context.Request.InputStream;
                int count = 0;
                byte[] buffer = new byte[1024];
                StringBuilder builder = new StringBuilder();
                while ((count = s.Read(buffer, 0, 1024)) > 0)
                {
                    builder.Append(Encoding.UTF8.GetString(buffer, 0, count));
                }
                s.Flush();
                s.Close();
                s.Dispose();
                UserInfo user = new UserInfo();                               
                JavaScriptSerializer serializer = new JavaScriptSerializer();
                //var json = serializer.Serialize(p);               ;

                var p1 = serializer.Deserialize<UserInfo>(builder.ToString());

                SqlConnection conn3 = new SqlConnection("Data Source = .; Initial Catalog = 用户中心; User Id = sa; Password = 666666");
                conn3.Open();              
                SqlCommand cmd = new SqlCommand("INSERT INTO [用户中心].[dbo].[UserInfo] ([UserName], [Pwd], [State], [QQ], [Mobile], [Email], [CreateTime], [RegIp], [ClientId], [Money], [SecurityQuestion], [Answer], [VerfyMobile], [VerfyEmail], [SouceUserId]) VALUES ( N'8', N'8', NULL, N'8', N'8', N'8', N'04 10 2017  3:42PM', NULL, NULL, N'0', NULL, NULL, '0', '0', '0')", conn3);
                cmd.ExecuteNonQuery();

                SqlCommand comm  = new SqlCommand("select * from UserInfo where UserName='8'", conn3);

                SqlDataReader dataReader = comm.ExecuteReader();
                string dd  = "";
                while (dataReader.Read())
                {
                  dd = dataReader[0].ToString();
                }
                context.Response.Write(dd.ToString());
 System.IO.Stream s = context.Request