แปลง code ส่งอีเมล์ ให้กลายเป็น class ส่งอีเมล์ ทำอย่างไรครับ

using(NotesSession ns = new NotesSession())
{
	ns.Initialize("notespassword");
	// ...
}

protected void SendButton_Click(object sender, DirectEventArgs e)
{
	{ // send email to related person 
		string mailDoc = this.txtContent.Text.ToString();
		string mailTo = this.txtTo.Text.ToString();
		string mailCc = this.txtCc.Text.ToString();
		string mailFrom = this.txtFrom.Text.ToString();
		string mailSubj = this.txtSubject.Text.ToString();

		// Switch Notes User.id file
		NotesRegistration reg = new NotesRegistration();
		reg.RegistrationServer = this.txtNotesServer.Text.ToString();
		reg.SwitchToID("C:\Lotus\Notes\Data\enduser.id", "notespassword");
		
		//Create new notes session                               
		NotesSession ns = new NotesSession();                
		NotesDatabase db = null;
		NotesDocument doc = null;
		NotesMIMEEntity body = null;
		NotesStream stream = null;
		object oItemValue = null;

		//Initialize Notes Session                         
		ns.Initialize("notespassword");
		ns.ConvertMime = false;

		//Get Database via server name & c:\notes\data\mailfilename.nsf if not found set to false to not create one         
		db = ns.GetDatabase(this.txtNotesServer.Text.ToString(), this.txtNotesFile.Text.ToString(), false);
		
		//If the database is not already open then open it. 
		if (!db.IsOpen) { db.Open(); }

		//////////// code send mail //////////

		stream = ns.CreateStream();

		//Create the notes document 
		doc = db.CreateDocument();

		//Set document type 
		doc.ReplaceItemValue("Form", "Memo");

		//sent notes memo fields (To: CC: Bcc: Subject etc)   
		doc.ReplaceItemValue("SendTo", mailTo);
		if (!string.IsNullOrEmpty(mailCc)){
			doc.ReplaceItemValue("CC:", mailCc);
		}
		doc.ReplaceItemValue("Subject", mailSubj);

		//body        
		body = doc.CreateMIMEEntity("Body");
		stream.WriteText(mailDoc, EOL_TYPE.EOL_CRLF);
		body.SetContentFromText(stream, "text/html;charset=UTF-8", MIME_ENCODING.ENC_NONE);
		body.EncodeContent(MIME_ENCODING.ENC_NONE);

		//send email & pass in byRef field, this case SendTo (always have this, cc or bcc may not always be there. 
		oItemValue = doc.GetItemValue("SendTo");
		doc.Send(false, ref oItemValue);

		//release mail resources.
		mailDoc = string.Empty;
		body = null;
		doc = null;
		stream = null;
		ns.ConvertMime = true;
		db = null;
		ns = null;
		reg = null;        
	}
}