This snippet demonstrates how to send mail via Smtp with .NET 2.0. 
For that it uses the MailMessage-and SmtpClient-class. 
The programm attached is a simple SendMail Console-Client.

using System;
using System.Collections.Generic;
using System.Text;

using System.Net.Mail;

namespace SmtpMail
{
    class Program
    {
        /// <summary>
        /// Console App to send mails via Smtp
        /// </summary>
        /// <param name="args[0]">From</param>
        /// <param name="args[1]">To</param>
        /// <param name="args[2]">Subject</param>
        /// <param name="args[3]">Body</param>
        /// <param name="args[4]">Host</param>
        /// <param name="args[5]">Port</param>
        /// <param name="args[6]">User</param>
        /// <param name="args[7]">Password</param>
        static void Main(string[] args)
        {
            try
            {
                // TODO: Add error handling for invalid arguments

                // To
                MailMessage mailMsg = new MailMessage();
                mailMsg.To.Add(args[1]);

                // From
                MailAddress mailAddress = new MailAddress(args[0]);
                mailMsg.From = mailAddress;

                // Subject and Body
                mailMsg.Subject = args[2];
                mailMsg.Body    = args[3];

                // Init SmtpClient and send
                SmtpClient smtpClient = new SmtpClient(args[4], Convert.ToInt32(args[5]));
                System.Net.NetworkCredential credentials = new System.Net.NetworkCredential(args[6], args[7]);
                smtpClient.Credentials = credentials;

                smtpClient.Send(mailMsg);
            }
            catch (Exception ex)
            {
                Console.WriteLine( ex.Message );
            }

        }
    }
}


===================================================================================

Send Email in C# Code
In order to send email in C# code, do the following: 

// create mail message object
MailMessage mail = new MailMessage();
mail.From = "";           // put the from address here
mail.To = "";             // put to address here
mail.Subject = "";        // put subject here	
mail.Body = "";           // put body of email here
SmtpMail.SmtpServer = ""; // put smtp server you will use here 
// and then send the mail
SmtpMail.Send(mail);

=========================================================================================

public void Send() {

MailMessage MailMesaji = new MailMessage();

MailMesaji.Subject = "subject";

MailMesaji.Body = "mail body";

MailMesaji.BodyEncoding = Encoding.GetEncoding("Windows-1251"); // Cyrillic Character Encoding

MailMesaji.From = "sender mail adress";

this.MailMesaji.To.Add(new MailAddress("to mail adress"));

System.Net.Mail.SmtpClient Smtp = new SmtpClient();

Smtp.Host = "smtp.gmail.com"; // for example gmail smtp server

Smtp.EnableSsl = true;

Smtp.Credentials = new System.Net.NetworkCredential("account name", "password");

Smtp.Send(MailMesaji);



}