// Open the Windows Forms library

open System.Windows.Forms

​

// Create a window and set a few properties

let form = new Form(Visible=true, TopMost=true, Text="Welcome to F#")

​

// Create a label to show some text in the form

let label =

    let x = 3 + (4 * 5)

    new Label(Text = sprintf "x = %d" x)

​

// Add the label to the form

form.Controls.Add(label)

​

// Finally, run the form

[<System.STAThread>]

Application.Run(form)