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

namespace WindowsFormsApplication1
{
    public partial class Form1 : Form
    {
        TextBox tbusername = new TextBox();
        TextBox tbpassword = new TextBox();
        Button blogin = new Button();

        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            tbusername.Text = "使用者名稱";
            tbusername.Location = new Point(100, 100);
                        
            tbpassword.Text = "密碼";
            tbpassword.PasswordChar = '*';
            tbpassword.Location = new Point(100, 125);
                        
            blogin.Text = "登陸";
            blogin.Location = new Point(100, 150);
            blogin.Click+=new EventHandler(blogin_Click);

            this.Controls.Add(tbusername);
            this.Controls.Add(tbpassword);
            this.Controls.Add(blogin);
        }
        private void blogin_Click(object o, EventArgs ea)
        {
            if (tbusername.Text.Equals("") && tbpassword.Text.Equals(""))
            {
                this.WindowState = FormWindowState.Maximized;
                tbusername.Visible = false;
                tbpassword.Visible = false;
                blogin.Visible = false;
            }
        }
    }
}