Draw Rubber Band like Explorer using C# .NET

Hi Friends,

Today we will see how to draw a rubber band rectangle like Explorer does. in C#. You can easily do the same in VB.NET also.
It was a tough task assigned by my project manager. But I have achieved it.
Steps:

1. Create a Windows Form application named as RubberBandRectangle.
2. Give Form name as frmMain
3. Paste the following code in your frmMain.cs file

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Drawing.Drawing2D;
namespace RubberBandRectangle
{
    ///

    /// Class to simulate Rubber Band rectangle
    ///

    /// Mahesh Bagul
    public partial class frmMain : Form
    {
        #region Declaration
        private Point MouseDownPosition { get; set; }
        private Point CurrentMousePos { get; set; }
        Color selectionColor;
        Brush selectionBrush;
        Color frameColor;
        Pen framePen;

        #endregion
        #region Constructor
        public frmMain()
        {
            InitializeComponent();
            this.MouseDownPosition = Point.Empty;
            DoubleBuffered = true;
            this.BackColor = Color.White;
            this.selectionColor = Color.FromArgb(200, 0xE8, 0xED, 0xF5);
            this.selectionBrush = new SolidBrush(selectionColor);
            this.frameColor = Color.FromArgb(0x33, 0x5E, 0xA8);
            this.framePen = new Pen(frameColor);
        }
        #endregion
        #region FormEvents
        ///

        /// MouseMove event
        ///

        ///
        /// Mahesh Bagul
        protected override void OnMouseMove(MouseEventArgs e)
        {
            base.OnMouseMove(e);
            if (e.Button == MouseButtons.Left && MouseDownPosition != Point.Empty)
                Invalidate();
        }
        ///

        /// OnPaint Event
        ///

        ///
        /// Mahesh Bagul
        protected override void OnPaint(PaintEventArgs e)
        {
            e.Graphics.SmoothingMode = SmoothingMode.AntiAlias;
           
            if (MouseDownPosition != Point.Empty)
            {
                CurrentMousePos = this.PointToClient(MousePosition);
                Rectangle selectedRect = new Rectangle(
                    Math.Min(MouseDownPosition.X, CurrentMousePos.X),
                    Math.Min(MouseDownPosition.Y, CurrentMousePos.Y),
                    Math.Abs(CurrentMousePos.X - MouseDownPosition.X),
                    Math.Abs(CurrentMousePos.Y - MouseDownPosition.Y));
                e.Graphics.FillRectangle(selectionBrush, selectedRect);
                e.Graphics.DrawRectangle(framePen, selectedRect);
            }
        }
        protected override void OnResize(EventArgs e)
        {
            base.OnResize(e);
            Invalidate();
        }
        ///

        /// OnMouseDown Event
        ///

        ///
        /// Mahesh Bagul
        protected override void OnMouseDown(MouseEventArgs e)
        {
            base.OnMouseDown(e);
            if (e.Button == MouseButtons.Left)
                MouseDownPosition = e.Location;
        }
   
        ///

        /// OnMouseUp Event
        ///

        ///
        /// Mahesh Bagul
        protected override void OnMouseUp(MouseEventArgs e)
        {
            base.OnMouseUp(e);
            MouseDownPosition = Point.Empty;
            Invalidate();
        }

        #endregion
        #region Functions
     
        #endregion
      
    }
}



Compile and Run.....  fill beauty of .NET.
Keep Smiling.

Mahesh Bagul