效果如下：

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
 
using System.IO;
using System.Reflection;
using System.Drawing.Imaging;
 
namespace testWinCeGraphics
{
    public partial class Form1 : Form
    {
        private string currentPath = Path.GetDirectoryName(Assembly.GetExecutingAssembly().GetName().CodeBase);//获取PDA路径
        private Bitmap bg, title,btn;
 
        private Rectangle rectangle;
        Color transpColor = Color.FromArgb(255, 0, 255);//资源文件的透明色
        ImageAttributes imageAttr;
 
        public Form1()
        {
            InitializeComponent();
        }
 
        private void Form1_Load(object sender, EventArgs e)
        {
            bg = new Bitmap(currentPath + @"\image\bg294.jpg");
            title = new Bitmap(currentPath + @"\image\title.jpg");
 
            btn = new Bitmap(currentPath + @"\image\button.bmp");
            rectangle = new Rectangle(10, 60,219,48);
            //rectangle = new Rectangle();
            imageAttr = new ImageAttributes();
            imageAttr.SetColorKey(transpColor, transpColor);
        }
 
        private void Form1_Paint(object sender, PaintEventArgs e)
        {
            e.Graphics.DrawImage(bg, 0, 0);
            e.Graphics.DrawImage(title, 0, 0);
            //要更改图片显示请更改rectangle中x,y轴的坐标
            e.Graphics.DrawImage(btn, rectangle, 0, 0, 219, 48, GraphicsUnit.Pixel, imageAttr);
 
            //写字
            Font sFont = new Font(FontFamily.GenericSansSerif, 16, FontStyle.Bold);
            e.Graphics.DrawString("入库管理",sFont,new SolidBrush(Color.Red),50,70);
 
        }
 
 
 
    }
}