获取本机机器名和登录WINDOWS的用户名？

using System; 
using System.Drawing; 
using System.Collections; 
using System.ComponentModel; 
using System.Windows.Forms; 
using System.Data; 
using System.Security.Principal; 

namespace Project32 
{ 
    /// <summary> 
    /// Summary description for WinForm. 
    /// </summary> 
    public class WinForm : System.Windows.Forms.Form 
    { 
       /// <summary> 
       /// Required designer variable. 
       /// </summary> 
       private System.ComponentModel.Container components = null; 
       private System.Windows.Forms.Label label1; 
       private System.Windows.Forms.Label label2; 
       private System.Windows.Forms.Button button1; 

       public WinForm() 
       { 
          // 
          // Required for Windows Form Designer support 
          // 
          InitializeComponent(); 

          // 
          // TODO: Add any constructor code after InitializeComponent call 
          // 
       } 

       /// <summary> 
       /// Clean up any resources being used. 
       /// </summary> 
       protected override void Dispose (bool disposing) 
       { 
          if (disposing) 
          { 
             if (components != null) 
             { 
                components.Dispose(); 
             } 
          } 
          base.Dispose(disposing); 
       } 

       #region Windows Form Designer generated code 
       /// <summary> 
       /// Required method for Designer support - do not modify 
       /// the contents of this method with the code editor. 
       /// </summary> 
       private void InitializeComponent() 
       { 
          this.label1 = new System.Windows.Forms.Label(); 
          this.label2 = new System.Windows.Forms.Label(); 
          this.button1 = new System.Windows.Forms.Button(); 
          this.SuspendLayout(); 
          // 
          // label1 
          // 
          this.label1.Location = new System.Drawing.Point(24, 48); 
          this.label1.Name = "label1"; 
          this.label1.Size = new System.Drawing.Size(248, 32); 
          this.label1.TabIndex = 0; 
          this.label1.Text = "label1"; 
          // 
          // label2 
          // 
          this.label2.Location = new System.Drawing.Point(16, 112); 
          this.label2.Name = "label2"; 
          this.label2.Size = new System.Drawing.Size(256, 40); 
          this.label2.TabIndex = 1; 
          this.label2.Text = "label2"; 
          // 
          // button1 
          // 
          this.button1.Location = new System.Drawing.Point(32, 192); 
          this.button1.Name = "button1"; 
          this.button1.Size = new System.Drawing.Size(72, 32); 
          this.button1.TabIndex = 2; 
          this.button1.Text = "button1"; 
          this.button1.Click += new System.EventHandler(this.button1_Click); 
          // 
          // WinForm 
          // 
          this.AutoScaleBaseSize = new System.Drawing.Size(6, 14); 
          this.ClientSize = new System.Drawing.Size(292, 266); 
          this.Controls.Add(this.button1); 
          this.Controls.Add(this.label2); 
          this.Controls.Add(this.label1); 
          this.Name = "WinForm"; 
          this.Text = "WinForm"; 
          this.ResumeLayout(false); 
       } 
       #endregion 

       /// <summary> 
       /// The main entry point for the application. 
       /// </summary> 
       [STAThread] 
       static void Main() 
       { 
          Application.Run(new WinForm()); 
       } 
       
       private void button1_Click(object sender, System.EventArgs e) 
       { 
             //获取本机机器 
          String machineName=System.Environment.MachineName; 
          label1.Text=machineName; 

          //取得账号 
          WindowsPrincipal wp = new WindowsPrincipal(WindowsIdentity.GetCurrent()); 
          label2.Text=wp.Identity.Name; 
       } 
    } 
}