using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;

namespace dragControl
{
public partial class Form1 : Form
{
private System.Windows.Forms.Button button1;

public Form1()
{
InitializeComponent();
}
protected override void OnLoad(EventArgs e)
{
base.OnLoad(e);
this.button1 = new System.Windows.Forms.Button();
//
// button1
//
this.button1.Location = new System.Drawing.Point(116, 65);
this.button1.Name = "button1";
this.button1.Size = new System.Drawing.Size(75, 23);
this.button1.TabIndex = 0;
this.button1.Text = "button1";
this.button1.UseVisualStyleBackColor = true;
this.button1.MouseDown += new System.Windows.Forms.MouseEventHandler(this.button1_MouseDown);

this.Controls.Add(this.button1);
}
private void button1_MouseDown(object sender, MouseEventArgs e)
{
this.button1.DoDragDrop(sender, DragDropEffects.Move);
}
protected override void OnDoubleClick(EventArgs e)
{
base.OnDoubleClick(e);
Form2 frm = new Form2();
frm.Show();
}
}
}


代码Form2.cs
 

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 dragControl
{    
   public partial class Form2 : Form    
   {        
      public Form2()        
      {
            InitializeComponent();
        }
        protected override void OnLoad(EventArgs e)
        {
            base.OnLoad(e);
            this.AllowDrop = true;
            this.DragDrop += new System.Windows.Forms.DragEventHandler(this.Form2_DragDrop);
            this.DragOver += new System.Windows.Forms.DragEventHandler(this.Form2_DragOver);
        }
        private void Form2_DragOver(object sender, DragEventArgs e)
        {
            if (e.AllowedEffect == DragDropEffects.Move)
            {
                e.Effect = DragDropEffects.Move;
            }
        }
        private void Form2_DragDrop(object sender, DragEventArgs e)
        {
            Button btn = e.Data.GetData("System.Windows.Forms.Button") as Button;
            if (btn != null)
            {
                if (btn.Parent != null)
                {
                    btn.Parent.Controls.Remove(btn);
                    btn.Location = this.PointToClient(new Point(e.X, e.Y));
                    this.Controls.Add(btn);
                }
            }
        }
    }
}