Drag n Drop Button

[Bombdrop]

I'm trying to drag and drop a button around a form, when i release the mouse the button is not where i wish it to be.

/*
 * Created by SharpDevelop.
 * User: Bombdrop
 * Date: 03/08/2005
 * Time: 12:00
 *
 */
using System;
using System.Drawing;
using System.Windows.Forms;

namespace Drag
{
    /// <summary>
    /// Description of MainForm.
    /// </summary>
    public class MainForm : System.Windows.Forms.Form
    {
        private System.Windows.Forms.Button button1;
        private Point location = new Point();
        public MainForm()
        {
            //
            // The InitializeComponent() call is required for Windows Forms designer support.
            //
            InitializeComponent();
            
            //
            // TODO: Add constructor code after the InitializeComponent() call.
            //
        }
        
        [STAThread]
        public static void Main(string[] args)
        {
            Application.Run(new MainForm());
        }
        
        #region Windows Forms Designer generated code
        /// <summary>
        /// This method is required for Windows Forms designer support.
        /// Do not change the method contents inside the source code editor. The Forms designer might
        /// not be able to load this method if it was changed manually.
        /// </summary>
        private void InitializeComponent() {
            this.button1 = new System.Windows.Forms.Button();
            this.SuspendLayout();
            // 
            // button1
            // 
            this.button1.Location = new System.Drawing.Point(56, 192);
            this.button1.Name = "button1";
            this.button1.Size = new System.Drawing.Size(160, 24);
            this.button1.TabIndex = 3;
            this.button1.Text = "button1";
            this.button1.MouseDown += new System.Windows.Forms.MouseEventHandler(this.Button1MouseDown);
            // 
            // MainForm
            // 
            this.AllowDrop = true;
            this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
            this.ClientSize = new System.Drawing.Size(292, 266);
            this.Controls.Add(this.button1);
            this.Name = "MainForm";
            this.Text = "MainForm";
            this.DragDrop += new System.Windows.Forms.DragEventHandler(this.MainFormDragDrop);
            this.DragEnter += new System.Windows.Forms.DragEventHandler(this.MainFormDragEnter);
            this.ResumeLayout(false);
        }
        #endregion
        
        
        
        void MainFormDragDrop(object sender, System.Windows.Forms.DragEventArgs e)
        {
            location.X=e.X;
            location.Y=e.Y;
            button1.Location=location;
        }
        
        void MainFormDragEnter(object sender, System.Windows.Forms.DragEventArgs e)
        {
            e.Effect = DragDropEffects.Move;
        }
        
        
        
        
        
        void Button1MouseDown(object sender, System.Windows.Forms.MouseEventArgs e)
        {
            this.button1.DoDragDrop(button1,DragDropEffects.Move);
        }
        
    }
}