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

namespace MoveableControlDemo
{
    public partial class MoveableBaseControl 
        : UserControl
    {
        private bool _isMoving = false;
        private int _deltaX = 0;
        private int _deltaY = 0;

        public MoveableBaseControl()
        {
            InitializeComponent();
        }

        private void MoveableBaseControl_MouseDown(
            object sender, 
            MouseEventArgs e)
        {
            _isMoving = true;
            _deltaX = e.X;
            _deltaY = e.Y;
        }

        private void MoveableBaseControl_MouseUp(
            object sender, 
            MouseEventArgs e)
        {
            _isMoving = false;
        }

        private void MoveableBaseControl_MouseMove(
            object sender, 
            MouseEventArgs e)
        {
            if (_isMoving && e.Button == MouseButtons.Left)
            {
                this.Location = new Point(
                    this.Location.X + (e.X - _deltaX), 
                    this.Location.Y + (e.Y - _deltaY)
                    );
            }
        }
    }
}