Picturebox trong lập trình C# Winform

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 ImageGUI
{
    public partial class Form1 : Form
    {
        string extention = ".png";
        public Form1()
        {
            InitializeComponent();

            cbImage.SelectedValueChanged += cbImage_SelectedValueChanged;

            LoadImageName();
        }

        void cbImage_SelectedValueChanged(object sender, EventArgs e)
        {
            ComboBox cb = sender as ComboBox;

            if (cb.SelectedValue != null)
            {
                Bitmap bm = new Bitmap(Application.StartupPath + "\\Resources\\" + cb.SelectedValue.ToString() + extention);

                pcbImage.Image = bm;
            }
        }
        void LoadImageName()
        {
            List<string> ListImage = new List<string>() { "1", "2", "3"};
            cbImage.DataSource = ListImage;
        }
    }
}
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namespace ImageGUI
{
    partial class Form1
    {
        /// <summary>
        /// Required designer variable.
        /// </summary>
        private System.ComponentModel.IContainer components = null;

        /// <summary>
        /// Clean up any resources being used.
        /// </summary>
        /// <param name="disposing">true if managed resources should be disposed; otherwise, false.</param>
        protected override void Dispose(bool disposing)
        {
            if (disposing && (components != null))
            {
                components.Dispose();
            }
            base.Dispose(disposing);
        }

        #region Windows Form Designer generated code

        /// <summary>
        /// Required method for Designer support - do not modify
        /// the contents of this method with the code editor.
        /// </summary>
        private void InitializeComponent()
        {
            this.pcbImage = new System.Windows.Forms.PictureBox();
            this.cbImage = new System.Windows.Forms.ComboBox();
            ((System.ComponentModel.ISupportInitialize)(this.pcbImage)).BeginInit();
            this.SuspendLayout();
            // 
            // pcbImage
            // 
            this.pcbImage.BackgroundImageLayout = System.Windows.Forms.ImageLayout.Zoom;
            this.pcbImage.Location = new System.Drawing.Point(139, 12);
            this.pcbImage.Name = "pcbImage";
            this.pcbImage.Size = new System.Drawing.Size(223, 226);
            this.pcbImage.SizeMode = System.Windows.Forms.PictureBoxSizeMode.Zoom;
            this.pcbImage.TabIndex = 0;
            this.pcbImage.TabStop = false;
            // 
            // cbImage
            // 
            this.cbImage.FormattingEnabled = true;
            this.cbImage.Location = new System.Drawing.Point(12, 12);
            this.cbImage.Name = "cbImage";
            this.cbImage.Size = new System.Drawing.Size(121, 21);
            this.cbImage.TabIndex = 1;
            // 
            // Form1
            // 
            this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F);
            this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
            this.ClientSize = new System.Drawing.Size(374, 261);
            this.Controls.Add(this.cbImage);
            this.Controls.Add(this.pcbImage);
            this.Name = "Form1";
            this.Text = "Form1";
            ((System.ComponentModel.ISupportInitialize)(this.pcbImage)).EndInit();
            this.ResumeLayout(false);

        }

        #endregion

        private System.Windows.Forms.PictureBox pcbImage;
        private System.Windows.Forms.ComboBox cbImage;
    }
}

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