c# - Error sending an Email MVC -

i'm trying send email mvc application, when tried send error message "could not find part of path 'c:\temp\67088830-4abc-41c6-afbe-6856bb817889.eml'." @ line

                    smtp.send(mail); 

any idea or suggestion on how solve error...

also code send it.

                    mailmessage mail = new mailmessage();                     mail.to.add(configurationmanager.appsettings["to"]);                     mail.from = new mailaddress(configurationmanager.appsettings["from"]);                     mail.subject = configurationmanager.appsettings["subject"];                     string body = "test";                     mail.body = body;                     mail.isbodyhtml = true;                     smtpclient smtp = new smtpclient();                     smtp.host = configurationmanager.appsettings["host"];                     smtp.port = convert.toint32(configurationmanager.appsettings["port"]);                     smtp.usedefaultcredentials = false;                     smtp.credentials = new system.net.networkcredential                    (configurationmanager.appsettings["user"], configurationmanager.appsettings["pass"]);                     smtp.enablessl = false;                     smtp.send(mail); 

try setting in webconfig or in file smtp delivery method network

<smtp deliverymethod="network">