C# - How to show the full Windows 10 build number?

Question

How to show the full Windows 10 build on C#?

I'm currently using Environment.OSVersion.VersionString but it's not showing the full build number

The result:

Microsoft Windows NT 10.0.17134.0

But I want the last number, my full build: 10.0.17134.228

I want to know how can I show the last missing number. Not only where to find the number. The c# code to get it.

[Microsoft Docs](https://learn.microsoft.com/en-us/dotnet/api/system.environment.osversion?redirectedfrom=MSDN&view=netframework-4.7.2#remarks) say: 'Starting with Windows 8, the OSVersion property returns the same major and minor version numbers for all Windows platforms. Therefore, we do not recommend that you retrieve the value of this property to determine the operating system version.' — nilsK, Aug 27 '18 at 14:50
What do you recommend to check if the user is using the latest Windows version/build? The first 17134 version was released on April, but Microsoft released 9 new builds of it, how can I check if the user is using the latest one? — saulob, Aug 27 '18 at 14:55
Sorry friend, i dont have a clue. Just stumbled over that link and wanted to share that information =) — nilsK, Aug 27 '18 at 14:58
P-Invoke GetVersionEx - see [related question](http://stackoverflow.com/a/8406674/20257) — Yuval Peled, Aug 27 '18 at 15:04
Possible duplicate of [Detecting Windows 10 OS Build minor version](https://stackoverflow.com/questions/47926094/detecting-windows-10-os-build-minor-version) — magicandre1981, Aug 28 '18 at 15:00
this makes no difference, it is the same question about getting the Revision number. — magicandre1981, Aug 29 '18 at 14:33
I included more details to explain that I want to know how to show not only how to find it. The c# command of it. @Lews Therin did that on his answer, added not only where but how to. — saulob, Aug 30 '18 at 10:50

score 5 · Accepted Answer · edited Aug 27 '18 at 17:07

5

The Windows 10 build number is stored in the registry in HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\ in the UBR key.

Here's how to get it in code:

using Microsoft.Win32;

// ...

RegistryKey registryKey = Registry.LocalMachine.OpenSubKey(@"SOFTWARE\Microsoft\Windows NT\CurrentVersion");

var buildNumber = registryKey.GetValue("UBR").ToString();

EDIT: Fixed the value name to get the correct number for OP. Credit for the correct key to Jorge Aguiar.

edited Aug 27 '18 at 17:07

saulob

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answered Aug 27 '18 at 15:05

Lews Therin

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Didn't work, it showed me: 17134, I'm looking for the 228 value. After the current build. – saulob Aug 27 '18 at 15:09
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Fixed to the correct key identified by Jorge Aguiar. This should get you what you need @saulob. – Lews Therin Aug 27 '18 at 15:13
It's "using Microsoft.Win32" not "using Microsoft.Windows", I edited :) – saulob Aug 27 '18 at 16:33

score 3 · Answer 2 · answered Aug 27 '18 at 15:01

3

You can get the last missing number at

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\UBR

(it's a DWORD value. It might be missing in some Windows versions.)

answered Aug 27 '18 at 15:01

Jorge Aguiar

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You want the `CurrentBuild` value. – Lews Therin Aug 27 '18 at 15:02
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@LewsTherin no, the `CurrentBuild`value, in the provided example, contains 17134, not 228. – Jorge Aguiar Aug 27 '18 at 15:05
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My mistake, Jorge is correct. This will get OP the number he wants. – Lews Therin Aug 27 '18 at 15:11
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@LewsTherin he's trying to get the number _after_ the `CurrentBuild`, in his example it's 228, which is stored in the registry key I mentioned – Jorge Aguiar Aug 27 '18 at 15:13
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Yes, and I fixed my answer and made a comment acknowledging you had the correct key. My bad. – Lews Therin Aug 27 '18 at 15:14
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Correct, combined with my parts of my answer - The code to obtain the number is: `Registry.LocalMachine.OpenSubKey("Software\\Microsoft\\Windows NT\\CurrentVersion").GetValue("UBR");` – Adrian Aug 27 '18 at 15:15

score 1 · Answer 3 · answered Mar 26 '20 at 13:39

You've to combine the 2 values to get "OS build":

RegistryKey registryKey = Registry.LocalMachine.OpenSubKey(@"SOFTWARE\Microsoft\Windows NT\CurrentVersion");

var _UBR = registryKey.GetValue("UBR").ToString();
var _CurrentBuild = registryKey.GetValue("CurrentBuild").ToString();

string _version = _CurrentBuild+"."+ _UBR;

score 1 · Answer 4 · answered Jul 02 '21 at 19:19

Cheesy way to get what you're asking for:

Process.Start(new ProcessStartInfo
        {
            FileName = @"C:\Windows\System32\cmd.exe",
            Arguments = "/c ver",
            RedirectStandardOutput = true,
            UseShellExecute = false
        }).StandardOutput.ReadToEnd().Trim();

Returns a string like:
Microsoft Windows [Version 10.0.19043.1052]

C# - How to show the full Windows 10 build number?

4 Answers4