messageBox

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;

namespace messagebox
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void get_text_Click(object sender, EventArgs e)
        {
            MessageBox.Show(messageText.Text, "Output");
        }
    }
}