Step 1: Click New Project, then select Visual C# on the left, then Windows and then select Windows Forms Application. Name your project "ImageZoom" and then click OK
Step 2: Design your form as below

Step 3: Add code to button click event handler as below
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
namespace ImageZoom
{
public partial class Form1 : Form
{
Image imgOriginal;
public Form1()
{
InitializeComponent();
}
private void btnOpen_Click(object sender, EventArgs e)
{
//Open image
using (OpenFileDialog ofd = new OpenFileDialog() { Multiselect = false, ValidateNames = true, Filter = "JPEG|*.jpg" })
{
if (ofd.ShowDialog() == DialogResult.OK)
{
pictureBox1.Image = Image.FromFile(ofd.FileName);
imgOriginal = pictureBox1.Image;
}
}
}
//Zoom image file
Image Zoom(Image img,Size size)
{
Bitmap bmp = new Bitmap(img, img.Width + (img.Width * size.Width / 100), img.Height + (img.Height * size.Height / 100));
Graphics g = Graphics.FromImage(bmp);
g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic;
return bmp;
}
private void trackBar1_Scroll(object sender, EventArgs e)
{
if (trackBar1.Value > 0)
{
pictureBox1.Image = Zoom(imgOriginal, new Size(trackBar1.Value, trackBar1.Value));
}
}
private void Form1_FormClosing(object sender, FormClosingEventArgs e)
{
if (pictureBox1.Image != null)
pictureBox1.Dispose();
}
}
}
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