The Lua scripting engine is fully integrated with the .NET CLR. This means that you can script .NET without having to compile code. Here is a simple script you can attach to a command and run. It displays a .NET Windows Form with two buttons:

luanet.load_assembly("System.Windows.Forms")
luanet.load_assembly("System.Drawing)
Form = luanet.import_type("System.Windows.Forms.Form")
Button = luanet.import_type("System.Windows.Forms.Button")
Point = luanet.import_type("System.Drawing.Point")
 
form1=Form()
button1=Button()
button2=Button()

function handleClick(sender,data)
  if sender.Text=="OK" then
    sender.Text="Clicked"
  else
    sender.Text="OK"
  end
  button1.MouseUp:Remove(handler)
  print(sender:ToString())
end

button1.Text = "OK"
button1.Location=Point(10,10)
button2.Text = "Cancel"
button2.Location=Point(button1.Left, button1.Height + button1.Top + 10)
handler=button1.MouseUp:Add(handleClick)
form1.Text = "My Dialog Box"
form1.HelpButton = true
form1.MaximizeBox = false
form1.MinimizeBox = false
form1.AcceptButton = button1
form1.CancelButton = button2
form1.Controls:Add(button1)
form1.Controls:Add(button2)
form1:ShowDialog()

The next example creates and displays a simple Lua Editor that enables you to test and run scripts:

luanet.load_assembly("System.Windows.Forms")
luanet.load_assembly("System.Drawing")

Form=luanet.import_type("System.Windows.Forms.Form")
TextBox=luanet.import_type("System.Windows.Forms.TextBox")
Label=luanet.import_type("System.Windows.Forms.Label")
ListBox=luanet.import_type("System.Windows.Forms.ListBox")
Button=luanet.import_type("System.Windows.Forms.Button")
Point=luanet.import_type("System.Drawing.Point")
Size=luanet.import_type("System.Drawing.Size")
Lua=luanet.import_type("LuaInterface.Lua")
OpenFileDialog=luanet.import_type("System.Windows.Forms.OpenFileDialog")
File=luanet.import_type("System.IO.File")
StreamReader=luanet.import_type("System.IO.StreamReader")
FileMode=luanet.import_type("System.IO.FileMode")
ScrollBars=luanet.import_type("System.Windows.Forms.ScrollBars")
FormBorderStyle=luanet.import_type("System.Windows.Forms.FormBorderStyle")
FormStartPosition=luanet.import_type("System.Windows.Forms.FormStartPosition")

function clear_click(sender,args)
  code:Clear()
end

function execute_click(sender,args)
  results.Items:Clear()
  result=lua:DoString(code.Text)
  if result then
    for i=0,result.Length-1 do
      results.Items:Add(result[i])
    end
  end
end

function load_click(sender,args)
  open_file:ShowDialog()
  file=StreamReader(open_file.FileName)
  code.Text=file:ReadToEnd()
  file:Close()
end

form = Form()
code = TextBox()
label1 = Label()
execute = Button()
clear = Button()
results = ListBox()
label2 = Label()
load = Button()
lua = Lua()
lua:OpenBaseLib()
open_file = OpenFileDialog()

form:SuspendLayout()

code.Location = Point(16, 24)
code.Multiline = true
code.Name = "Code"
code.Size = Size(440, 128)
code.ScrollBars = ScrollBars.Vertical
code.TabIndex = 0
code.Text = ""

label1.Location = Point(16, 8)
label1.Name = "label1"
label1.Size = Size(100, 16)
label1.TabIndex = 1
label1.Text = "Lua Code:"

execute.Location = Point(96, 160)
execute.Name = "Execute"
execute.TabIndex = 2
execute.Text = "Execute"
execute.Click:Add(execute_click)

clear.Location = Point(176, 160)
clear.Name = "Clear"
clear.TabIndex = 3
clear.Text = "Clear"
clear.Click:Add(clear_click)

results.Location = Point(16, 208)
results.Name = "Results"
results.Size = Size(440, 95)
results.TabIndex = 4

label2.Location = Point(16, 192)
label2.Name = "label2"
label2.Size = Size(100, 16)
label2.TabIndex = 5
label2.Text = "Results:"

load.Location = Point(16, 160)
load.Name = "Load"
load.TabIndex = 6
load.Text = "Load..."
load.Click:Add(load_click)

open_file.DefaultExt = "lua"
open_file.Filter = "Lua Scripts|*.lua|All Files|*.*"
open_file.Title = "Pick a File"

form.AutoScaleBaseSize = Size(5, 13)
form.ClientSize = Size(472, 315)
form.Controls:Add(load)
form.Controls:Add(label2)
form.Controls:Add(results)
form.Controls:Add(clear)
form.Controls:Add(execute)
form.Controls:Add(label1)
form.Controls:Add(code)
form.Name = "MainForm"
form.Text = "LuaNet"
form.FormBorderStyle = FormBorderStyle.Fixed3D
form.StartPosition = FormStartPosition.CenterScreen
form:ResumeLayout(false)

form:ShowDialog()

If you are interested in learning more about scripting the .NET CLR, the following documentation is available:

http://www.chipmunkav.com/support/guide.pdf
http://www.chipmunkav.com/support/luainterface.pdf

Shaun