How do I read a value from registry?

Question

I want to read the port number for remote desktops, but it doesn't work.

HKEY_LOCAL_MACHINE\System\CurrentControlSet\Control\TerminalServer\WinStations\RDP-Tcp\PortNumber

which is a key that exists in my registry on Windows 8.

private void Form1_Load(object sender, EventArgs e) { txtPort.Text = (string) Registry.GetValue(@"HKEY_LOCAL_MACHINE\System\CurrentControlSet\Control\TerminalServer\WinStations\RDP-Tcp", "PortNumber", ""); }

The string returned is null.

Correct answer:

private void Form1_Load(object sender, EventArgs e) { txtPort.Text = Registry.GetValue(@"HKEY_LOCAL_MACHINE\System\CurrentControlSet\Control\Terminal Server\WinStations\RDP-Tcp\", "PortNumber", -1).ToString(); }

Have you checked the actual registry to see whether there's a value there? — Jon Skeet
– Jon Skeet, Commented Aug 30, 2013 at 13:20
Are you running Visual Studio with a user that has rights to check the registry ? try runnin VS as Administrator — Mauricio Gracia Gutierrez
– Mauricio Gracia Gutierrez, Commented Aug 30, 2013 at 13:22
I did run as administrator just to be sure, because I read that writing to the registry requires this. — Kasper Hansen
– Kasper Hansen, Commented Aug 30, 2013 at 13:30

dtb · Accepted Answer · 2013-08-30 13:22:01Z

7

There's a space in "Terminal Server":

@"HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Terminal Server\WinStations\RDP-Tcp" ↑

answered Aug 30, 2013 at 13:22

dtb

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5 Comments

Jon Skeet Over a year ago

And it's an int, not a string.

Shankar Narayana Damodaran Over a year ago

@JonSkeet, He's just showing that on a textfield right ? So does it matter ?

Jon Skeet Over a year ago

@ShankarDamodaran: Yes, it matters. He's casting to string, which will fail when the value returned is a boxed int.

Kasper Hansen Over a year ago

Thanks. My programming world falls apart when copy/paste doesn't work

Jon Skeet Over a year ago

@KasperHansen: The natural thing to do when diagnosing this is just to run regedit and validate it for yourself. (That's what I did, and was about to post a similar answer when I saw that dtb had already done so.)

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