send an email through C#

http://www.codeproject.com/KB/aspnet/Email_Sending_Programme.aspx
http://www.aspheute.com/english/20000918.asp

http://www.c-sharpcorner.com/UploadFile/dchoksi/SendingMail02132007002923AM/SendingMail.aspx

check http://emoreau.com/Entries/Articles/2007/09/Using-SystemNetMail.aspx

a nice article on sending mail through asp.net 2.0 :-

http://www.4guysfromrolla.com/articles/072606-1.aspx

another article:-

http://blogs.sitepoint.com/sending-web-email-asp-net/

to use:
MailingUtilities.autoSendMailTo("hi", "hello world", "yourmail@gmail.com",false);

C# Code Snippet - Send Email Using SMTP Server
http://www.digitalcoding.com/Code-Snippets/C-Sharp/C-Code-Snippet-Send-Email-Using-SMTP-Server.html

Did you know there are over 20,000 questions (and answers) already on Experts Exchange on how to send email from C#? That little search box in the top-right corner works miracles. ;)

Here are a few links that look like they have good answers, with links and examples (I did glance over them quickly to make sure the answer in the question wasn't nonsense, but I didn't read them all in depth):

http:Q_24901587.html
http:Q_23260537.html
http:Q_20322791.html
http:Q_24739892.html
http:Q_24739438.html