c# - Sending mail and pulling data from app.config -

i have situation. html code standard 3 text boxes , 1 button:

<add key="cma_contact_form_email" value="somec@gmail.com"/> <add key="cma_contact_to_address" value="some@gmail.com"/> <add key="smtpserver" value="smtp.gmail.com" /> <add key="enablessl" value = "true"/> <add key="smtpport" value="993" /> <add key="smtpuser" value="some@gmail.com" /> <add key="smtppass" value="pass" /> 

code behind:

protected void imagebutton_click(object sender, eventargs e){         mailmessage msg = new mailmessage();         msg.to.add(configurationmanager.appsettings["cma_contact_form_email"]);         msg.from = new        mailaddress(configurationmanager.appsettings["cma_contact_to_address"]);          msg.body += "name: " + txtname.text + "\n";         msg.body += "email: " + txtemail.text + "\n";         msg.body += "message: \n" + txtmessage.text + "\n";         msg.subject = txtname.text;          msg.isbodyhtml = true;         smtpclient smtp = new smtpclient();         smtp.host = configurationmanager.appsettings["smtpserver"]; //or smtp server address         smtp.port = convert.toint32(configurationmanager.appsettings["smtpport"]);          smtp.enablessl = convert.toboolean(configurationmanager.appsettings["enablessl"]);         smtp.credentials = new system.net.networkcredential(configurationmanager.appsettings["smtpuser"], configurationmanager.appsettings["smtppass"]);         //or smtp email id , password         try         {             smtp.send(msg);             lblpost.text = "thank you, question has been submitted our cma heldesk.";         }         catch (exception ex)         {              lblpost.text = "error occured while sending message. "  + ex.message;         }          placeholder.visible = false;         msgplaceholder.visible = true;     } 

normally should work, time-out error. know catch might be? thanks!

you can use following method check if connection permissible before doing actual send email , should handle smtpexception. has statuscode property, tell why send() failed.

you can call below method this

if(testconnection("smtpserveraddress",port))   sendemail();  public static bool testconnection(string smtpserveraddress, int port)     {         iphostentry hostentry = dns.gethostentry(smtpserveraddress);         ipendpoint endpoint = new ipendpoint(hostentry.addresslist[0], port);         using (socket tcpsocket = new socket(endpoint.addressfamily, sockettype.stream, protocoltype.tcp))         {             //try connect , test rsponse code 220 = success             tcpsocket.connect(endpoint);             if (!checkresponse(tcpsocket, 220))             {                 return false;             }              // send helo , test response code 250 = proper response             senddata(tcpsocket, string.format("helo {0}\r\n", dns.gethostname()));             if (!checkresponse(tcpsocket, 250))             {                 return false;             }              // if got here it's can connect smtp server             return true;         }     }    private static bool checkresponse(socket socket, int expectedcode) {     while (socket.available == 0)     {         system.threading.thread.sleep(100);     }     byte[] responsearray = new byte[1024];     socket.receive(responsearray, 0, socket.available, socketflags.none);     string responsedata = encoding.ascii.getstring(responsearray);     int responsecode = convert.toint32(responsedata.substring(0, 3));     if (responsecode == expectedcode)     {         return true;     }     return false; } 

gmail settings

• gmail smtp server address: smtp.gmail.com
• gmail smtp user name: example@gmail.com
• gmail smtp password: password
• gmail smtp port: 465
• gmail smtp tls/ssl required: yes