如何从WinForms应用程序控制新进程窗口的大小和位置？

using System.Diagnostics;

ProcessStartInfo startInfo = new ProcessStartInfo("notepad.exe");
startInfo.WindowStyle = ProcessWindowStyle.Normal;
startInfo.UseShellExecute = true;
startInfo.CreateNoWindow = false;
startInfo.WorkingDirectory = @"C:\";
startInfo.WindowPosition = new Point(100, 100);
startInfo.WindowSize = new Size(800, 600);

Process.Start(startInfo);

using System.Diagnostics;
using System.Runtime.InteropServices;

[DllImport("user32.dll", SetLastError = true)]
static extern bool SetWindowPos(IntPtr hWnd, IntPtr hWndInsertAfter, int X, int Y, int cx, int cy, uint uFlags);

Process[] processes = Process.GetProcessesByName("notepad");
Process process = processes[0];

IntPtr hWnd = process.MainWindowHandle;
SetWindowPos(hWnd, IntPtr.Zero, 100, 100, 800, 600, 0);