不斷提醒

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

namespace WindowsApplication2
{
 /// <summary>
 /// Form2 的摘要描述。
 /// </summary>
 public class Form2 : System.Windows.Forms.Form
 {
  private System.Windows.Forms.Label label1;
  private System.Windows.Forms.Timer timer1;
  private System.Windows.Forms.Timer timer2;
  private System.Windows.Forms.Timer timer3;
  private System.Windows.Forms.Timer timer4;
  private System.ComponentModel.IContainer components;

  [STAThread]
  static void Main()
  {
   Application.Run(new Form2());
  }

  public Form2()
  {
   //
   // Windows Form 設計工具支援的必要項
   //
   InitializeComponent();

   //
   // TODO: 在 InitializeComponent 呼叫之後加入任何建構函式程式碼
   //
   Init();
  }

  private void Init()
  {
   this.HeightMax = 120;//窗體滾動的高度
   this.WidthMax = 148;//窗體滾動的寬度
   this.ScrollShow();
  }

  /// <summary>
  /// 清除任何使用中的資源。
  /// </summary>
  protected override void Dispose( bool disposing )
  {
   if( disposing )
   {
    if(components != null)
    {
     components.Dispose();
    }
   }
   base.Dispose( disposing );
  }

  #region Windows Form 設計工具產生的程式碼
  /// <summary>
  /// 此為設計工具支援所必須的方法 - 請勿使用程式碼編輯器修改
  /// 這個方法的內容。
  /// </summary>
  private void InitializeComponent()
  {
   this.components = new System.ComponentModel.Container();
   this.label1 = new System.Windows.Forms.Label();
   this.timer1 = new System.Windows.Forms.Timer(this.components);
   this.timer2 = new System.Windows.Forms.Timer(this.components);
   this.timer3 = new System.Windows.Forms.Timer(this.components);
   this.timer4 = new System.Windows.Forms.Timer(this.components);
   this.SuspendLayout();
   //
   // label1
   //
   this.label1.BackColor = System.Drawing.Color.Teal;
   this.label1.Font = new System.Drawing.Font("新細明體", 18F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((System.Byte)(136)));
   this.label1.ForeColor = System.Drawing.Color.White;
   this.label1.Location = new System.Drawing.Point(24, 56);
   this.label1.Name = "label1";
   this.label1.Size = new System.Drawing.Size(104, 24);
   this.label1.TabIndex = 0;
   this.label1.Text = "Welcome";
   //
   // timer1
   //
   this.timer1.Interval = 10;
   this.timer1.Tick += new System.EventHandler(this.timer1_Tick);
   //
   // timer2
   //
   this.timer2.Interval = 10;
   this.timer2.Tick += new System.EventHandler(this.timer2_Tick);
   //
   // timer3
   //
   this.timer3.Interval = 10;
   this.timer3.Tick += new System.EventHandler(this.timer3_Tick);
   //
   // timer4
   //
   this.timer4.Interval = 10;
   this.timer4.Tick += new System.EventHandler(this.timer4_Tick);
   //
   // Form2
   //
   this.AutoScaleBaseSize = new System.Drawing.Size(5, 15);
   this.BackColor = System.Drawing.Color.Teal;
   this.ClientSize = new System.Drawing.Size(152, 136);
   this.Controls.Add(this.label1);
   this.FormBorderStyle = System.Windows.Forms.FormBorderStyle.None;
   this.Name = "Form2";
   this.ShowInTaskbar = false;
   this.Text = "Form2";
   this.TopMost = true;
   this.Load += new System.EventHandler(this.Form2_Load);
   this.ResumeLayout(false);

  }
  #endregion

  private int heightMax, widthMax;
  public int HeightMax
  {
   set
   {
    heightMax = value; 
   }
   get
   {
    return heightMax;
   }
  }

  public int WidthMax
  {
   set
   {
    widthMax = value;
   }
   get
   {
    return widthMax;
   }
  }

  public void ScrollShow()
  {
   this.Width = widthMax;
   this.Height = 0;
   this.Show();
   this.timer1.Enabled = true;
  }

  public int StayTime = 5000;
  public int StayTime = 20000;

  private void ScrollUp()
  {
   if(Height < heightMax)
   {
    this.Height += 3;
    this.Location = new Point(this.Location.X, this.Location.Y - 3);
   }
   else
   {
    this.timer1.Enabled = false;
    this.timer2.Enabled = true;
   }
  }

  private void ScrollDown()
  {
   if(Height > 3)
   {
    this.Height -= 3;
    this.Location = new Point(this.Location.X, this.Location.Y + 3);
   }
   else
   {
    this.timer3.Enabled = false;
    //this.Close();
    this.timer4.Enabled = true;
   }
  }

  private void timer1_Tick(object sender, System.EventArgs e)
  {
   ScrollUp();
  }

  private void timer2_Tick(object sender, System.EventArgs e)
  {
   timer2.Enabled = false;
   timer3.Enabled = true;
  }

  private void timer3_Tick(object sender, System.EventArgs e)
  {
   ScrollDown();
  }

  private void timer4_Tick(object sender, System.EventArgs e)
  {
   timer4.Enabled=false;
   timer1.Enabled=true;
  }

  private void Form2_Load(object sender, System.EventArgs e)
  {
   Screen[] screens = Screen.AllScreens;
   Screen screen = screens[0];//獲取屏幕變量
   this.Location = new Point(screen.WorkingArea.Width - widthMax - 20, screen.WorkingArea.Height - 34);//WorkingArea為Windows桌面的工作區
   this.timer2.Interval = StayTime;
   this.timer4.Interval = StayTime;
  }

 }
}