Display MessageBox on Button Click Event in FSharp

Here we will learn to show MessageBox on Button Click in FSharp.

Write the following code.

open System
open System.Windows.Forms
open System.Drawing

let form=new Form()
form.Text<- "My Window Application"
form.BackColor <-Color.Gray
 
let btn=new Button()
btn.Text<- "Click"
btn.BackColor<- Color.Green

btn.Click.Add(fun a-> MessageBox.Show("Hi") |>ignore)

form.Controls.Add(btn)
Application.Run(form)

Then run the application. The output will be look like below figure.



When We Click on Button, MessageBox is displayed with message "Hi". Like below figure.