using System; using System.Drawing; using System.Collections; using System.ComponentModel; using System.Windows.Forms; using System.Data; using System.Text; using System.Web.Mail; using System.Net.Sockets; using System.IO; namespace SendMail { /// /// Form1 の概要の説明です。 /// public class Form1 : System.Windows.Forms.Form { private System.Windows.Forms.Button buttonSend; private Sys