C# Hide and Unhide Comments

How do I hide or unhide a form in C#

Okay, my code for Form1 which has a button that shows Form2:

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 WindowsFormsApplication1
{
    public partial class Form1 : Form
    {
        Form2 f2 = null;

        public Form1()
        {
            InitializeComponent();
        }

        private void btnShowForm2_Click(object sender, EventArgs e)
        {
            if (f2 == null) { f2 = new Form2(); }
            f2.Show();
        }
    }
}

and on Form2, I put a textbox with no events (but its text is remembered between hiding and showing Form2), and it has a button that hides its form. here's the code for Form2:

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 WindowsFormsApplication1
{
    public partial class Form2 : Form
    {
        public Form2()
        {
            InitializeComponent();
        }

        private void btnHideMe_Click(object sender, EventArgs e)
        {
            this.Hide();
        }
    }
}

Is it possible to turn off and on all the // comments at once on Visual Express C#?

Select the lines then:

Ctrl + K + U

And the opposite:

Ctrl + K + C

You can find the shortcuts also through the menus - Edit -> Advanced -> ... The shortcuts are listed next to the commands.

And of course, these are also on the Text Editor toolbar:

Hide / Unhide a file is not working so well

MSDN:

var attributes = File.GetAttributes(fi);
if ((attributes & FileAttributes.Hidden) == FileAttributes.Hidden)
{
    attributes &= ~FileAttributes.Hidden;
    File.SetAttributes(fi, attributes);
}

How to hide / unhide a process in C#?

Finally, the process is operating properly. Thanks to all of your help, I came up with this fix.

The p.MainWindowHandle was 0, so I had to use the user32 FindWindow() function to get the window handle.

//Initialization
int SW_SHOW = 5;

[DllImport("user32.dll",SetLastError=true)]
private static extern IntPtr FindWindow(string lpClassName, string lpWindowName);

[DllImport("user32.dll")]
private static extern bool ShowWindow(IntPtr hwnd, int nCmdShow);

[DllImport("user32.dll")]
private static extern bool EnableWindow(IntPtr hwnd, bool enabled);

And in my main function:

ProcessStartInfo info = new ProcessStartInfo();
info.FileName = "notepad";
info.UseShellExecute = true;
info.WindowStyle = ProcessWindowStyle.Hidden;

Process p = Process.Start(info);
p.WaitForInputIdle();
IntPtr HWND = FindWindow(null, "Untitled - Notepad");

System.Threading.Thread.Sleep(1000);

ShowWindow(HWND, SW_SHOW);
EnableWindow(HWND, true);

References:

pinvoke.net: FindWindow()

Edit:
Removed WindowShowStyle from the dllImport declaration: you can define this as an int instead. I defined an enum called WindowShowStyle to define the constants outlined in this article. It just better fits my coding patterns to have enums defined instead of using constant or hard-coded values.

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