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演示了.NET中基于角色的安全控制，并且演示了安全控制中，对应用程序域的初始化步骤。

using System;
using System.Collections;
using System.ComponentModel;
using System.Drawing;
using System.Windows.Forms;

public class WindowsForm : System.Windows.Forms.Form
{
    public static void Main()
    {
        AppDomain currentDomain = AppDomain.CurrentDomain;
        currentDomain.SetPrincipalPolicy(
            System.Security.Principal.PrincipalPolicy.WindowsPrincipal);
        Application.Run(new WindowsForm());
    }

    private Button btnOp1, btnOp2;
   
    public WindowsForm()
    {
        btnOp1 = new Button();
        btnOp1.Text = "操作A（本操作对角色无要求）";
        btnOp1.Size = new Size(300, 23);
        btnOp1.Location = new Point(10, 20);
        btnOp1.Click += new EventHandler(OnOperation1);
        this.Controls.Add(btnOp1);
       
        btnOp2 = new Button();
        btnOp2.Text = "操作B（本操作要求本机管理员权限）";
        btnOp2.Size = new Size(300, 23);
        btnOp2.Location = new Point(10, 60);
        btnOp2.Click += new EventHandler(OnOperation2);
        this.Controls.Add(btnOp2);
       
        this.Size = new Size(360, 180);
    }
   
    private void OnOperation1(object sender, EventArgs e)
    {
        MessageBox.Show("操作A");
    }   
   
    [System.Security.Permissions.PrincipalPermission(
        System.Security.Permissions.SecurityAction.Demand,
        Role="Administrators")]
    private void OnOperation2(object sender, EventArgs e)
    {
        MessageBox.Show("操作B");
    }   
}