How to send E-mail from .NET applications

The code sample is written in C# and intends to send mail from .NET applications. The code is implemented as a partial class in C# that extends a Page class. Thus making the code easily reusable.

The method that actually sends the e-mail is an event handler for a button. So, to use this code create a .aspx page with a button, textarea, and corresponding textboxes. Attach this handler to the button's click event.

using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Web.Mail;


public partial class SendingMail : System.Web.UI.Page
{
    
    protected void Page_Load(object sender, EventArgs e)
    {
    }
    protected void btnSend_Click(object sender, EventArgs e)
    {
        // Sending mail using Code..
        MailMessage mm = new MailMessage();
        try
        {
            mm.From = "gagrawal@del.aithent.com";
            mm.To = txtTO.Text.ToString();
            mm.Cc = txtCC.Text.ToString();
            mm.Bcc = txtBCC.Text.ToString();
            mm.Body = txtBody.Text.ToString();
            mm.Subject = txtSubject.Text.ToString();
            string filePath = fileupload1.PostedFile.FileName;
            mm.Attachments.Add(new System.Web.Mail.MailAttachment(filePath,MailEncoding.UUEncode));
            System.Web.Mail.SmtpMail.Send(mm);
            lblMessage.Text = "Email successfully sent.";
        }
        catch(Exception ex)
        {
            lblMessage.Text = "Send Email Failed." + ex.Message;
        }
        
    }
}