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.Net.Mail;

public partial class Default : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
    }
    protected void Button1_Click(object sender, EventArgs e)
    {
//Calling the function SendMail
      Response.Write( SendMail("meetuchoudhary@gmail.com","meetudmeet@gmail.com","meetudmeet@yahoo.com","Test Mail","Test Mail Body"));
    }

    public string SendMail(string toList, string from, string ccList, string subject, string body)
    {
        MailMessage message = new MailMessage();
        SmtpClient smtpClient = new SmtpClient();
        string msg = string.Empty;
        try
        {
            MailAddress fromAddress = new MailAddress(from);
            message.From = fromAddress;
            message.To.Add(toList);
            if (ccList != null && ccList != string.Empty)
                message.CC.Add(ccList);
            message.Subject = subject;
            message.IsBodyHtml = true;
            message.Body = body;
            smtpClient.Host = "mail.server.com";
            smtpClient.Port = 25;
            smtpClient.UseDefaultCredentials = true;
            smtpClient.Credentials = new System.Net.NetworkCredential("info@server.com", "password");           

            smtpClient.Send(message);
            msg = "Successful";
        }
        catch (Exception ex)
        {
            msg = ex.Message;
        }
        return msg;
    }

}