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void Subscribe() 

{ 

string retCode = "1"; // if retCode = 1 returned value is an error code, if retCode = 0 returned value is the error text 

string ret_val = SubscribeUser(retCode); 

// Once the value has been returned it is possible to decide what to do/view

// ******************************************************** 

// If retCode = 1 returned values are the following: 

// 0 : Operation completed 

// 1 : Generic error

// 2 : Invalid email address

// 3 : User already subscribed

// ******************************************************** 

switch(ret_val) 

{ 

case "0": 

// Display a message saying the user was subscribed successfully 

break; 

case "1": 

// Display a message saying the service is not accessible at the moment

break; 

case "2": 

// Display a message saying the email address in an invalid address

break; 

case "3": 

// Display a message saying that the user is already subscribed 

break; 

default: 

// Display a message saying the service is temporarily unavailable

break; 

} 

//************************************************************************** 

// If retCode = 0 error text is returned

//************************************************************************** 

// For example, the value ret_val can be associated to a Label object

} 

// This function calls the user's registration page and returns an output value 

string SubscribeUser(string retCode) 

{ 

string strEmail = Request.Params["email"]; // user's email address

string intList = Request.Params["list"]; // list ID 

string intGroup = Request.Params["group"]; // group to which to subscribe the user (optional) 

string blnConfirm = "1"; //Confirmation request

string csvFldNames = "Field1;Field2;Field3;Field4"; //Field names are taken from the Codes Table

string csvFldValues = "Name;Surname;Company;M"; //Values are assigned to the corresponding fields in the same order as csvFldNames 

string result = ""; // returned value

string url = "http://newsletter.nomedominio.tld/frontend/xmlSubscribe.aspx"; 

url += "?list=" + intList + "&group=" + intGroup + "&email=" + strEmail + "&confirm=" + blnConfirm.ToString() + "&csvFldNames=" + csvFldNames + "&csvFldValues=" + csvFldValues + "&retCode=" + retCode; 

System.Net.HttpWebRequest wreq = (System.Net.HttpWebRequest)System.Net.WebRequest.Create(url); 

wreq.Method = "GET"; 

wreq.Timeout = 10000; 

System.Net.HttpWebResponse wr = (System.Net.HttpWebResponse)wreq.GetResponse(); 

// If the page answers correctly the return value is obtained 

if (wr.StatusCode == System.Net.HttpStatusCode.OK) 

{ 

System.IO.Stream s = wr.GetResponseStream(); 

System.Text.Encoding enc = System.Text.Encoding.GetEncoding("utf-8"); 

System.IO.StreamReader readStream = new System.IO.StreamReader( s, enc ); 

// vreturn value

result = readStream.ReadToEnd(); 

} 

return result; 

} 

</script>