I use a website provided by the mobile phone company to send SMS messages, and charge it to my mobile phone, good to send bulk messages to friends and family.

I thought about using an automated method to send SMS to make it easier, I asked the mobile phone company if they provide something like a WebAPI or SMPP, but they don't.

So... I thought about using their form, and here come the greate HttpWebRequest and HttpWebResponse.

First I opened the login page... opened the page source, search for all form fields, login id, password and hidden fields.

Then I opened the Send SMS page... and did the same.

Now writing a test page:

protected void Page_Load(object sender, EventArgs e)

// Login Page

Uri uri = new Uri("http://WebSite/index.php");

// Login Form Fields

string data = "mo=login";

data += "&passwd=password";

data += "&login=1";

// Create a new instance of the CookieContainer

CookieContainer cookieContainer = new CookieContainer();

if (uri.Scheme == Uri.UriSchemeHttp)

// Create an instance of HttpWebRequest

HttpWebRequest request = HttpWebRequest.Create(uri) as HttpWebRequest;

// Preserve Cookies that have login information

// Method = Post

request.Method = WebRequestMethods.Http.Post;

// Data Length & Content Type

request.ContentType = "application/x-www-form-urlencoded";

// Write Data to stream, this will send data to the website but will not fill the CookieContainer

StreamWriter writer = new StreamWriter(request.GetRequestStream());

// Get Response from website to fill the CookieContainer

// Do the same here, and submitting the preserved cookies

uri = new Uri("http://WebSite/myo/schedulemsg.php");

data = "srcMSISDN=";

data += "&CustomerId=";

data += "&strRawText1=";

data += "&pagename=batsms2.php";

data += "&smsmode=web2sms";

data += "&dstMSISDN=";

data += "&requestType=WEB2SMS";

data += "&source=WEB";

data += "&message=Messsgae to send";

data += "&characters=1";

data += "&coding=0";

data += "&when=now";

data += "&schdate=";

data += "&hh=00";

data += "&mm=00";

data += "&send=Send";

if (uri.Scheme == Uri.UriSchemeHttp)

HttpWebRequest request = HttpWebRequest.Create(uri) as HttpWebRequest;

// Submit preserved cookies

request.Method = WebRequestMethods.Http.Post;

request.ContentType = "application/x-www-form-urlencoded";

StreamWriter writer = new StreamWriter(request.GetRequestStream());

// Create an instance of the response to check if the message was sent

HttpWebResponse response = request.GetResponse() as HttpWebResponse;

StreamReader reader = new StreamReader(response.GetResponseStream());

string tmp = reader.ReadToEnd();

if (tmp.IndexOf("Message was sent successfully !.") > 0)

Label1.Text = "Message was sent successfully !.";

else

Label1.Text = "Confirmation Message was not received.";

It is working :D as expected.