ASP. NET of VB write background to send SMS implementation code

 
Dim postData As String 
Dim byteArray As Byte() 
Dim objWebRequest As HttpWebRequest 
Dim newStream As Stream 

postData = "cell= SMS providers provide information 1&enterpriseId= SMS providers provide information 2&mobile= Mobile phone no. 1, Mobile phone no. 2&message= Send data to test... " 
objWebRequest = WebRequest.Create("http://xxx.yyy.com.cn/SmsSend.jsp") 
objWebRequest.Method = "POST" 
objWebRequest.ContentType = "application/x-www-form-urlencoded" 

byteArray = System.Text.Encoding.UTF8.GetBytes(postData) 
objWebRequest.ContentLength = byteArray.Length 
newStream = objWebRequest.GetRequestStream() 
newStream.Write(byteArray, 0, byteArray.Length) 
newStream.Close() 

' Return the data  
Dim response As HttpWebResponse 
Dim sr As StreamReader 
Dim textResponse As String 
response = objWebRequest.GetResponse() 
sr = New StreamReader(response.GetResponseStream(), System.Text.Encoding.Default) 
textResponse = sr.ReadToEnd()