c# - Send email through SMTP -

i have contact page on website , want users enter name , email id (no password) , send email on button click.

i did google , solutions getting requires user password,

public static void sendmessage(string subject, string messagebody, string toaddress, string ccaddress, string fromaddress) {     mailmessage message = new mailmessage();     smtpclient client = new smtpclient();      // set sender's address     message.from = new mailaddress(fromaddress);      // allow multiple "to" addresses separated semi-colon     if (toaddress.trim().length > 0)     {         foreach (string addr in toaddress.split(';'))         {             message.to.add(new mailaddress(addr));         }     }     // allow multiple "cc" addresses separated semi-colon     if (ccaddress.trim().length > 0)     {         foreach (string addr in ccaddress.split(';'))         {             message.cc.add(new mailaddress(addr));         }     }     // set subject , message body text     message.subject = subject;     message.body = messagebody;            // smtp settings     var smtp = new system.net.mail.smtpclient();     {         smtp.host = "smtphost";         smtp.port =portno;         smtp.enablessl = true;         smtp.deliverymethod = system.net.mail.smtpdeliverymethod.network;         smtp.credentials = new networkcredential("fromemail", "frompassword");         smtp.timeout = 20000;     }      // send e-mail message     smtp.send(message); } 

but don't want force users enter password. there other solution using smtp?

the error getting a connection attempt failed because connected party did not respond after period of time, or established connection failed because connected host has failed respond

i have function in utility class , , works charm.

public static bool sendmail(string email, string mailsubject, string mailbody)     {         bool issent = false, ismailviassl = convert.toboolean(configurationmanager.appsettings["mailserverusessl"]);          string mailhost = configurationmanager.appsettings["mailserveraddress"].tostring(),         senderaddress = configurationmanager.appsettings["mailserversenderusername"].tostring(),         senderpassword = configurationmanager.appsettings["mailserversenderpassword"].tostring();          int serverport = convert.toint32(configurationmanager.appsettings["mailserverport"]);          mailmessage msgemail = new mailmessage(new mailaddress(senderaddress), new mailaddress(email));         using (msgemail)         {             msgemail.isbodyhtml = true;             msgemail.bodyencoding = system.text.encoding.utf8;             msgemail.subject = mailsubject;             msgemail.body = mailbody;              using (smtpclient smtp = new smtpclient(mailhost))             {                 smtp.usedefaultcredentials = false;                 smtp.enablessl = ismailviassl;                 smtp.credentials = new networkcredential(senderaddress, senderpassword);                 smtp.port = serverport;                 try                 {                     smtp.send(msgemail);                     issent = true;                 }                 catch (exception ex)                 {                     throw ex;                 }             }         }         return issent;     }  <!-- mail server settings --> <add key="mailserveraddress" value="smtp.gmail.com" /> <add key="mailserverport" value="25" /> <add key="mailserversenderusername" value="username@gmail.com" /> <add key="mailserversenderpassword" value="password" /> <add key="mailserverusessl" value="true" />