WinForm登录模块设计开发

public partial class UserLogin : DevComponents.DotNetBar.Office2007RibbonForm
{
private SceneViewer sceneViewer = new SceneViewer();
private UserManage userManage = new UserManage();

public UserLogin()
{
InitializeComponent();
}

private void btnCancel_Click(object sender, EventArgs e)
{
this.Close();
//MessageBox.Show("请输入正确的用户名和密码！", "登陆失败！", MessageBoxButtons.OK, MessageBoxIcon.Warning);
}

private void btnLogin_Click(object sender, EventArgs e)
{

if (this.editUserName.Text == string.Empty)
{
MessageBox.Show("用户名不能为空！");
this.editUserName.Focus();
return;
}
else if(userManage.UserDictionary.ContainsKey(this.editUserName.Text))
{
string psd = userManage.UserDictionary[this.editUserName.Text];
if (this.editPassword.Text == psd)
{
MessageBox.Show("欢迎登录本系统！", "登陆成功！", MessageBoxButtons.OK, MessageBoxIcon.Information);
this.DialogResult = DialogResult.OK;
}
else
{
MessageBox.Show("密码错误，请重新输入！", "密码错误！", MessageBoxButtons.OK, MessageBoxIcon.Error);
this.editPassword.Text = string.Empty;
this.editPassword.Focus();
}
}
else
{
MessageBox.Show("用户名不存在！","登录失败！",MessageBoxButtons.OK,MessageBoxIcon.Warning);
this.editUserName.Text = string.Empty;
this.editPassword.Text = string.Empty;
this.editUserName.Focus();
}

}

private void btnLogin_KeyDown(object sender, KeyEventArgs e)
{
if (e.KeyCode == Keys.Enter)
{
this.btnLogin.Click+=new EventHandler(btnLogin_Click);
}
}

private void UserLogin_Load(object sender, EventArgs e)
{
if (this.editUserName.Text == string.Empty && this.editPassword.Text == string.Empty)
{
this.btnLogin.Enabled = false;
}
}

private void editPassword_TextChanged(object sender, EventArgs e)
{
if (this.editUserName.Text == string.Empty && this.editPassword.Text == string.Empty)
this.btnLogin.Enabled = false;
else if (this.editUserName.Text == string.Empty && this.editPassword.Text != string.Empty)
this.btnLogin.Enabled = false;

else if (this.editUserName.Text != string.Empty && this.editPassword.Text == string.Empty)
this.btnLogin.Enabled = false;
else
this.btnLogin.Enabled = true;

}

}

static class Program
{
/// <summary>
/// The main entry point for the application.
/// </summary>
[STAThread]
static void Main()
{
Application.EnableVisualStyles();
Application.SetCompatibleTextRenderingDefault(false);

UserLogin userLogin = new UserLogin();
try
{
if (userLogin.ShowDialog() == DialogResult.OK)
Application.Run(new SceneViewer());
else
Application.Exit();
}
finally
{
userLogin.Close();
}
}

}