/// <summary>
        /// 窗体显示方式
        /// </summary>
        public enum AnimateWindowEmu
        {
            AW_HOR_POSITIVE = 0x0001,//从左向右显示
            AW_HOR_NEGATIVE = 0x0002,//从右向左显示
            AW_VER_POSITIVE = 0x0004,//从上到下显示
            AW_VER_NEGATIVE = 0x0008,//从下到上显示
            AW_CENTER = 0x0010,//从中间向四周
            AW_HIDE = 0x10000,  //隐蔽
            AW_ACTIVATE = 0x20000,//普通显示
            AW_SLIDE = 0x40000,  //显示 
            AW_BLEND = 0x80000,//透明渐变显示
        }

               private void timer1_Tick(object sender, EventArgs e)
        {
            frmMsg _Form = new frmMsg();
            _Form.Size = new Size(200, 100);
            int _X = Screen.PrimaryScreen.Bounds.Width - _Form.Size.Width;
            int _Y = SystemInformation.WorkingArea.Height - _Form.Size.Height;
            _Form.StartPosition = FormStartPosition.Manual;
            _Form.Location = new Point(_X, _Y);
            //AnimateWindow. | AnimateWindow.AW_VER_NEGATIVE
            AnimateWindow(_Form.Handle, 1000, AnimateWindowEmu.AW_SLIDE | AnimateWindowEmu.AW_VER_NEGATIVE);
            _Form.Show(); 
        }

------解决方案--------------------
http://www.cnblogs.com/xianzuoqiaoqi/archive/2009/08/24/1552811.html

timer 或者 利用 
[DllImport("user32.dll", CharSet = CharSet.Auto)]
           public static extern bool AnimateWindow(
               IntPtr hwnd,  //  handle  to  window   
               int dwTime,  //  duration  of  animation   
               int dwFlags  //  animation  type   
           );




------解决方案--------------------

最简单的办法：做一个半透明Form弹出，控制其Location偏移量
代码：
C# code
using System; 
 using System.Collections.Generic; 
 using System.ComponentModel; 
 using System.Data; 
 using System.Drawing; 
 using System.Text; 
 using System.Windows.Forms; 
  
 namespace CommonModel 
 { 
   public class BalloonForm : Form 
   { 
  private System.ComponentModel.IContainer components = null; 
  
     ///  <summary> 
     /// Clean up any resources being used. 
     ///  </summary> 
     ///  <param name="disposing">true if managed resources should be disposed; otherwise, false. </param> 
     protected override void Dispose(bool disposing) 
     { 
       if (disposing && (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()