Create email C# with Asp.Net

Hi,
I am using Visual Studio 2013 for Web to develop an Asp.Net page with C#.
Now, I am in the moment to create a web form where the user clicks a button and an outlook message is displayed with certain information he currently have in the page, then the user should click on 'Send'.

First of all, the code displays an error in the 'Outlook.MailItem mailItem = (Outlook.MailItem)' suggesting there is no 'using Microsoft.Office.Interop.Outlook'

The code I am trying to make work is the following:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using Microsoft.Office.Interop.Outlook;

namespace WebApplication7
{
    public partial class _Default : Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {

        }

        protected void Button1_Click(object sender, EventArgs e)
        {
            CreateMailItem()
        }

        private void CreateMailItem()
        {
            Outlook.MailItem mailItem = (Outlook.MailItem)
                this.Application.CreateItem(Outlook.OlItemType.olMailItem);
            mailItem.Subject = "This is the subject";
            mailItem.To = "someone@example.com";
            mailItem.Body = "This is the message.";
            mailItem.Importance = Outlook.OlImportance.olImportanceLow;
            mailItem.Display(false);
        }


    }
}

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