How to make the main form invisible c#

Question

How do I make the main form created by Visual Studio invisible after opening another one? I tried to use the "Hide();" command, but I was unsuccessful.

code :

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
namespace WindowsFormsApplication5
{
public partial class Form1 : Form
{
    public Form1()
    {
        InitializeComponent();
    }

    private void button1_Click(object sender, EventArgs e)
    {
        Form2 f = new Form2();
        f.Show();
        // no caso ao abrir o Form2, o Form1 ficar invisivel.
    }
}
}

Answer 1

It has to be with Hide anyway, I just tested it here, and it works:

    private void button3_Click(object sender, EventArgs e)
    {
        Form2 f = new Form2();
        f.Show();
        this.Hide();
    }

Answer 2

Good is also possible like this, but out of curiosity since it is used to make the form transparent:

private void button3_Click(object sender, EventArgs e)
        {
            Form2 f = new Form2();
            this.Opacity = 0;
            f.ShowDialog();
            this.Opacity = 1;

        }