Here's a simple Platform Invoke example of how to resize a window - a feature I needed at one point (don't ask why) but couldn't find, not even in Eric Gunnerson's Win32 Window sample on GotDotNet.com.

using System;
using System.Runtime.InteropServices;
namespace SetWindowPositionSample
{
 
 public sealed class Window
 {
  [DllImport("user32.dll", CharSet=CharSet.Auto, SetLastError=true)]
  public static extern IntPtr FindWindow(
   string lpClassName,
   string lpWindowName);

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

  public static void SetPositionSize(string name, int x, int y, int width, int height)
  {
   IntPtr hWind = FindWindow(null, name);
   SetWindowPos(hWind, (IntPtr)null, x, y, width, height, 0u);
  }

  private Window()
  {

  }
 }
}

Here's a sample of how to call it:

public static void Main()
{
 Process proc = new Process();           
  proc.StartInfo.FileName = "Notepad.exe";
  proc.StartInfo.CreateNoWindow=true;
  proc.Start();

  // give the window time to open:
  Thread.Sleep(100);

 Window.SetPositionSize("Untitled - Notepad", 0, 0, 350, 111);
}