public OptionForm(object parameters) 
{ 
  InitializeComponent(); 
  this.myParams = parameters;//设置参数引用 
} 

form.buttonOK.Click += new EventHandler(buttonOK_Click); 
form.ShowDialog(); 

public object MyParams 
{ 
  get { return this.myParams; } 
  set { this.myParams = value; } 
} 

//获取参数 
public object GetParams() 
{ 
  return this.myParams; 
} 
//设置参数 
public void SetParams(object myParams ) 
{ 
  this.myParams = myParams; 
} 

public static class ParameterSettings 
{ 
  //公共静态变量 
  public static string Username = "Zhengzuo"; 
  //私有静态变量 
  private static string userRole = "Administrators"; 
  //私有静态变量 
  private static string password = "http://www.1sucai.cn/"; 
  //内部属性 
  internal static string UserRole 
  { 
    get { return userRole; } 
  } 
  //公共属性 
  public static string Password 
  { 
    get { return password; } 
    private set { password = value; } 
  } 
} 

string username = ParameterSettings.Username; 
string password = ParameterSettings.Password; 
string userRole = ParameterSettings.UserRole; 
ParameterSettings.Username = "郑佐";//修改成新用户名 

public class UserLoginInfo 
{ 
  //实现Singleton模式，线程安全。 
  private readonly static UserLoginInfo currentUserInfo = new UserLoginInfo(); 
  //提供全局访问点 
  public static UserLoginInfo CurrentUserInfo 
  { 
    get { return currentUserInfo; } 
  } 
  //阻止显式实例化，但不能阻止反射方式调用。 
  private UserLoginInfo() 
  { 
  } 
  //公共变量 
  public string Username; 
  //私有变量 
  private static string userRole; 
  //私有变量 
  private static string password; 
  //内部属性 
  internal string UserRole 
  { 
    get { return userRole; } 
    set { userRole = value; } 
  } 
  //公共属性 
  public string Password 
  { 
    get { return password; } 
    internal set { password = value; } 
  } 
} 

UserLoginInfo.CurrentUserInfo.Username ="郑佐"; 
UserLoginInfo.CurrentUserInfo.UserRole = "dotnetlover"; 
UserLoginInfo.CurrentUserInfo.Password = "http://www.1sucai.cn/"; 

//选项设置事件参数类 
public class OptionSettingEventArgs : EventArgs 
{ 
  private string changedPath; 
  //构造函数 
  public OptionSettingEventArgs(string changedPath) 
  { 
    this.changedPath = changedPath; 
  } 
  //读取参数 
  public string ChangedPath 
  { 
    get { return this.changedPath; } 
  } 
} 

//定义事件 
public event EventHandler<OptionSettingEventArgs> OptionSettingChanged; 
编写事件引发程序如下， 
//引发OptionSettingChanged事件 
protected virtual void OnOptionSettingChanged(OptionSettingEventArgs e) 
{ 
  if (OptionSettingChanged != null) 
  { 
    OptionSettingChanged(this, e); 
  } 
} 

//通过目录对话框设置新的路径 
private void buttonBrowser_Click(object sender, EventArgs e) 
{ 
  FolderBrowserDialog dialog = new FolderBrowserDialog(); 
  DialogResult result = dialog.ShowDialog(this); 
  if (result == DialogResult.OK) 
  { 
    if(this.textBoxPath.Text != dialog.SelectedPath) 
    { 
      this.textBoxPath.Text = dialog.SelectedPath; 
      OptionSettingEventArgs args = new OptionSettingEventArgs(dialog.SelectedPath); 
      OnOptionSettingChanged(args); 
    } 
  } 
} 

OptionForm form = new OptionForm(); 
//注册事件 
form.OptionSettingChanged += new EventHandler (form_OptionSettingChanged); 
form.ShowDialog(); 

private void form_OptionSettingChanged(object sender, OptionSettingEventArgs e) 
{ 
  string newPath = e.ChangedPath; 
  MessageBox.Show(this, String.Format("新路径为“{0}”。", newPath), "提示"); 
}