mail senidng in asp.net c# script

protected void btnSendmail_Click(object sender, EventArgs e)
 {
   // System.Web.Mail.SmtpMail.SmtpServer is obsolete in 2.0
   // System.Net.Mail.SmtpClient is the alternate class for this in 2.0
   SmtpClient smtpClient = new SmtpClient();
   MailMessage message = new MailMessage();

   try
   {
       MailAddress fromAddress = new MailAddress(txtEmail.Text, txtName.Text);

       // You can specify the host name or ipaddress of your server
       // Default in IIS will be localhost
       smtpClient.Host = "localhost";

       //Default port will be 25
       smtpClient.Port = 25;

       //From address will be given as a MailAddress Object
       message.From = fromAddress;

       // To address collection of MailAddress
       message.To.Add("admin1@yoursite.com");
       message.Subject = "Feedback";

       // CC and BCC optional
       // MailAddressCollection class is used to send the email to various users
       // You can specify Address as new MailAddress("admin1@yoursite.com")
       message.CC.Add("admin1@yoursite.com");
       message.CC.Add("admin2@yoursite.com");

       // You can specify Address directly as string
       message.Bcc.Add(new MailAddress("admin3@yoursite.com"));
       message.Bcc.Add(new MailAddress("admin4@yoursite.com"));

       //Body can be Html or text format
       //Specify true if it  is html message
       message.IsBodyHtml = false;

       // Message body content
       message.Body = txtMessage.Text;

       // Send SMTP mail
       smtpClient.Send(message);

       lblStatus.Text = "Email successfully sent.";
   }
   catch (Exception ex)
   {
       lblStatus.Text = "Send Email Failed." + ex.Message;
   }
 }

I did gave you a link to Microsoft article that explains all. Looks like you deleted that question :doh:

Now, here you go, have a look at this Microsoft Video tutorial:
Use ASP.NET to send Email from Website[^]

try this code:

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Net.Mail;
namespace sendEmailThroughC_sharp
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();

}

private void button1_Click(object sender, EventArgs e)
{

try
{
SmtpClient clientConnectionWithGmailSmtp = new SmtpClient("smtp.gmail.com");//it connect user with gmail smtp server
MailMessage mailMessage = new MailMessage();
mailMessage.From =new MailAddress(fromTB.Text);
mailMessage.To.Add(toTb.Text);
mailMessage.Priority = MailPriority.High;
mailMessage.Subject = subjectTB.Text;
mailMessage.Body = messageBodyTB.Text;
if (textBox1.Text != string.Empty)
{
Attachment attachment = new Attachment(textBox1.Text);
mailMessage.Attachments.Add(attachment);
}

clientConnectionWithGmailSmtp.Port = 587;
clientConnectionWithGmailSmtp.Credentials = new System.Net.NetworkCredential("sendmailthroughc@gmail.com", "Chooseapassword");
clientConnectionWithGmailSmtp.EnableSsl = true;

clientConnectionWithGmailSmtp.Send(mailMessage);
MessageBox.Show("mail Send");
}

catch (Exception ex)
{
MessageBox.Show(ex.ToString());
}
}

}
}