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

           private void button1_Click(object sender, EventArgs e)
           {
               if (textBox1.Text == "Hello")
                   label1.Text = "Hello there!";
           }
       }
}