请问高手:怎样实现窗体内的上下两部分进行拖动？

using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;namespace WindowsApplication22
{
/// <summary>
/// Summary description for Form1.
/// </summary>
public class Form1 : System.Windows.Forms.Form
{
private System.Windows.Forms.Panel panel1;
private System.Windows.Forms.Panel panel2;
private System.Windows.Forms.Splitter splitter1;
/// <summary>
/// Required designer variable.
/// </summary>
private System.ComponentModel.Container components = null; public Form1()
{
//
// 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.panel1 = new System.Windows.Forms.Panel();
this.panel2 = new System.Windows.Forms.Panel();
this.splitter1 = new System.Windows.Forms.Splitter();
this.SuspendLayout();
// 
// panel1
// 
this.panel1.BackColor = System.Drawing.Color.IndianRed;
this.panel1.Dock = System.Windows.Forms.DockStyle.Top;
this.panel1.Location = new System.Drawing.Point(0, 0);
this.panel1.Name = "panel1";
this.panel1.Size = new System.Drawing.Size(292, 88);
this.panel1.TabIndex = 0;
// 
// panel2
// 
this.panel2.BackColor = System.Drawing.Color.Lime;
this.panel2.Dock = System.Windows.Forms.DockStyle.Fill;
this.panel2.Location = new System.Drawing.Point(0, 88);
this.panel2.Name = "panel2";
this.panel2.Size = new System.Drawing.Size(292, 185);
this.panel2.TabIndex = 2;
this.panel2.Paint += new System.Windows.Forms.PaintEventHandler(this.panel2_Paint);
// 
// splitter1
// 
this.splitter1.BackColor = System.Drawing.SystemColors.ActiveCaption;
this.splitter1.Dock = System.Windows.Forms.DockStyle.Top;
this.splitter1.Location = new System.Drawing.Point(0, 88);
this.splitter1.Name = "splitter1";
this.splitter1.Size = new System.Drawing.Size(292, 24);
this.splitter1.TabIndex = 3;
this.splitter1.TabStop = false;
// 
// Form1
// 
this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
this.ClientSize = new System.Drawing.Size(292, 273);
this.Controls.Add(this.splitter1);
this.Controls.Add(this.panel2);
this.Controls.Add(this.panel1);
this.Name = "Form1";
this.Text = "Form1";
this.ResumeLayout(false); }
#endregion /// <summary>
/// The main entry point for the application.
/// </summary>
[STAThread]
static void Main() 
{
Application.Run(new Form1());
} private void panel2_Paint(object sender, System.Windows.Forms.PaintEventArgs e)
{

}
}
}