i have a problem during sending mail

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C#

good morning sir,

i read your code and when i apply it shows, i got" your mail not to be send"
sir i am a student and i freely registered in www.kohlihosting.net
sir can u tell me some example to fill it in field below

"    SmtpMail.SmtpServer = "your_server_address";    "

sir then i can figure out what i should write here,
i m using linux hosting,
some detail is given below:

VistaPanel version:2.4.0 RC1
Operating systemLinux
Apache version:2.2.12 (Unix)
PHP version:5.2.10
MySQL version:5.0.84
Skin / Graphics Originally developed by CPSkins.com

using System;
using System.Configuration;
using System.Data;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;
using System.Web.Mail;
using System.Net.Mail;

public partial class _Default : System.Web.UI.Page 
{
    protected void Page_Load(object sender, EventArgs e)
    {
    }
    public int sendMail(string to, string cc, string bcc, string subject, string body)
    {
        try
        {

            SmtpMail.SmtpServer = "your_server_address";
            MailMessage msg = new MailMessage();
            msg.From = "your_email_id";
            msg.To = to;
            msg.Cc = cc;
            msg.Bcc = bcc;
            msg.Subject = subject;
            msg.Body = body;
            SmtpMail.Send(msg);
            return (1);
        }
        catch
        {
            return (0);
        }
    }
    protected void Button1_Click(object sender, EventArgs e)
    {
        String to = TextBox1.Text; 
    String cc = ""; 
    String bcc =""; 
    String subject = ""; 
    String body = TextBox2.Text; 
    int status = sendMail(to,cc,bcc,subject,body); 
    if(status == 1) 
        Response.Write("your mail has been sent successfully"); 
    else 
        Response.Write("sorry! your mail could not be sent�"); 
    }
}