C# 设置屏幕分辨率

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.Runtime.InteropServices;
namespace 解决分辨率
{
    public partial class Form1 : Form
    {
        //保存当前屏幕分辨率
        int i = Screen.PrimaryScreen.Bounds.Width;
        int j = Screen.PrimaryScreen.Bounds.Height;
        public Form1()
        {
            InitializeComponent();
        }
        [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Auto)]
        public struct DEVMODE
        {
            [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 32)]
            public string dmDeviceName;
            public short dmSpecVersion;
            public short dmDriverVersion;
            public short dmSize;
            public short dmDriverExtra;
            public int dmFields;