LoginForm.cs

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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 LoginFormDemo
{
  public partial class LoginForm : Form
  {
    private bool isShowing = true;

    public LoginForm()
    {
      InitializeComponent();
    }
      // 下载于www.51aspx.com
    private void Authenticate()
    {      
      Refresh();

      if (! User.isValid(txtUserName.Text, txtPassword.Text))
      {
        MessageBox.Show("请输入正确的用户名和密码.",
          "登录失败", 
          MessageBoxButtons.OK, 
          MessageBoxIcon.Information);

        DialogResult = DialogResult.None; // keep the login form open
        return;
      }   
       
      // Valid user, pass the authentication
      User.Initialize();
      User.Instance.Username = txtUserName.Text;
      User.Instance.Password = txtPassword.Text;

      DialogResult = DialogResult.OK; 
      Refresh();
    }

    private void LoginForm_Load(object sender, EventArgs e)
    {
      Opacity = 0.0; // fully transparent
      Activate();
      Refresh();
      fadeTimer.Start();
      Refresh();
    }

    private void btnOk_Click(object sender, EventArgs e)
    {
      Authenticate();
    }

    private void btnCancel_Click(object sender, EventArgs e)
    {