tweets.rb

require 'mscorlib'                                                                               
require 'System.Windows.Forms, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089'
require 'System.Xml, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089'

include System::Net
include System::Text
include System::Windows::Forms
include System::Xml

class MyForm < Form

  def initialize
    textbox = TextBox.new
    textbox.dock = DockStyle.Top
    textbox.text = "yohfee"

    button = Button.new
    button.dock = DockStyle.Top
    button.text = "Get timeline"

    listbox = ListBox.new
    listbox.dock = DockStyle.Fill

    self.controls << listbox << button << textbox

    button.click do
      listbox.items.clear
      account = textbox.text
      url = "http://twitter.com/statuses/user_timeline/#{account}.xml"

      client = WebClient.new
      client.encoding = Encoding.UTF8
      data = client.download_data(url)
      result = Encoding.UTF8.get_string(data)

      doc = XmlDocument.new
      doc.load_xml(result)
      nodes = doc.select_nodes("//statuses/status/text")
      nodes.each{|node| listbox.items << node.inner_text}
    end
  end

end

Application.run MyForm.new