MessageBox in Web Application

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.Windows.Forms;
using System.Collections.Generic;
using System.ComponentModel;
using System.Drawing;
using System.Text;

public partial class msgbox : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{

}
protected void Button1_Click(object sender, EventArgs e)
{
string message = "Do you want to take print?";
string caption = "Maximum Three Prints";
MessageBoxButtons buttons = MessageBoxButtons.YesNo;
MessageBoxIcon icon = MessageBoxIcon.Question;
MessageBoxDefaultButton btn = MessageBoxDefaultButton.Button1;
DialogResult result;
result = MessageBox.Show(message, caption, buttons,icon,btn);
if (result == DialogResult.Yes)
{

Label1.Text = "success";

}
else
{
Label1.Text = "Failure";
}

}
}