C# WinForms Barcode Generator DLL Tutorial

using System;
using System.Drawing;
using System.Windows.Forms;
using OnBarcode.Barcode;

namespace OnBarcodeGeneratorWinFormsNetFrameworkDemo
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
            //  Initial controls
            this.btForeColor.BackColor = Color.Black;
            this.btBackColor.ForeColor = Color.White;
            updatePictureBox();
        }

        private void btForeColor_Click(object sender, EventArgs e)
        {
            ColorDialog colorDialog = new ColorDialog();
            if (colorDialog.ShowDialog() == DialogResult.OK)
            {
                this.btForeColor.BackColor = colorDialog.Color;
                updatePictureBox();
            }
        }

        private void btBackColor_Click(object sender, EventArgs e)
        {
            ColorDialog colorDialog = new ColorDialog();
            if (colorDialog.ShowDialog() == DialogResult.OK)
            {
                this.btBackColor.BackColor = colorDialog.Color;
                updatePictureBox();
            }
        }

        private void btShow_Click(object sender, EventArgs e)
        {
            updatePictureBox();
        }

        private void updatePictureBox()
        {
            try
            {
                QRCode barcode = new QRCode();
                barcode.DataMode = QRCodeDataMode.Auto;
                barcode.Data = this.tbData.Text;
                barcode.AutoResize = true;
                barcode.UOM = UnitOfMeasure.INCH;
                barcode.BarcodeWidth = float.Parse(this.tbWidth.Text);
                barcode.BarcodeHeight = float.Parse(this.tbWidth.Text);
                barcode.Resolution = int.Parse(this.tbResolution.Text);
                barcode.ForeColor = this.btForeColor.BackColor;
                barcode.BackColor = this.btBackColor.BackColor;

                //  Note: Image in PictureBox would ignore resolution in Bitmap.
                this.pictureBoxPreview.Image = barcode.drawBarcode();
            }
            catch { }
        }
    }
}