using System; 
 using System.Drawing; 
 using System.Collections; 
 using System.ComponentModel; 
 using System.Windows.Forms; 
 using System.Data; 
  
 namespace DragDrop 
 { 
  ///  <summary> 
  /// Form1 的摘要说明。 
  ///  </summary> 
  public class Form1 : System.Windows.Forms.Form 
  { 
 private System.Windows.Forms.ListBox listBox1; 
 private System.Windows.Forms.ListBox listBox2; 
 ///  <summary> 
 /// 必需的设计器变量。 
 ///  </summary> 
 private System.ComponentModel.Container components = null; 
  
 public Form1() 
 { 
  // 
  // Windows 窗体设计器支持所必需的 
  // 
  InitializeComponent(); 
  
  // 
  // TODO: 在 InitializeComponent 调用后添加任何构造函数代码 
  // 
 } 
  
 ///  <summary> 
 /// 清理所有正在使用的资源。 
 ///  </summary> 
 protected override void Dispose( bool disposing ) 
 { 
  if( disposing ) 
  { 
   if (components != null) 
   { 
    components.Dispose(); 
   } 
  } 
  base.Dispose( disposing ); 
 } 
  
 #region Windows 窗体设计器生成的代码 
 ///  <summary> 
 /// 设计器支持所需的方法 - 不要使用代码编辑器修改 
 /// 此方法的内容。 
 ///  </summary> 
 private void InitializeComponent() 
 { 
  this.listBox1 = new System.Windows.Forms.ListBox(); 
  this.listBox2 = new System.Windows.Forms.ListBox(); 
  this.SuspendLayout(); 
  // 
  // listBox1 
  // 
  this.listBox1.ItemHeight = 12; 
  this.listBox1.Location = new System.Drawing.Point(32, 24); 
  this.listBox1.Name = "listBox1"; 
  this.listBox1.Size = new System.Drawing.Size(120, 280); 
  this.listBox1.TabIndex = 0; 
  this.listBox1.MouseDown += new System.Windows.Forms.MouseEventHandler(this.listBox1_MouseDown); 
  // 
  // listBox2 
  // 
  this.listBox2.ItemHeight = 12; 
  this.listBox2.Location = new System.Drawing.Point(248, 24); 
  this.listBox2.Name = "listBox2"; 
  this.listBox2.Size = new System.Drawing.Size(120, 280); 
  this.listBox2.TabIndex = 0; 
  this.listBox2.DragDrop += new System.Windows.Forms.DragEventHandler(this.listBox2_DragDrop); 
  this.listBox2.DragEnter += new System.Windows.Forms.DragEventHandler(this.listBox2_DragEnter); 
  // 
  // Form1 
  // 
  this.AutoScaleBaseSize = new System.Drawing.Size(6, 14); 
  this.ClientSize = new System.Drawing.Size(408, 333); 
  this.Controls.Add(this.listBox1); 
  this.Controls.Add(this.listBox2); 
  this.Name = "Form1"; 
  this.Text = "Form1"; 
  this.Load += new System.EventHandler(this.Form1_Load); 
  this.ResumeLayout(false); 
  
 } 
 #endregion 
  
 ///  <summary> 
 /// 应用程序的主入口点。 
 ///  </summary> 
 [STAThread] 
 static void Main() 
 { 
  Application.Run(new Form1()); 
 } 
  
 private void Form1_Load(object sender, System.EventArgs e) 
 { 
  this.listBox1.AllowDrop = true; 
  this.listBox2.AllowDrop = true; 
  this.listBox1.Items.Add("a"); 
  this.listBox1.Items.Add("b"); 
  this.listBox1.Items.Add("c");