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How to obtain IP addresses of everything on network in c#

I have a sonicwall on a network of around 100 machines.
I have tried and tried to find a way of creating 2 combobox's that will contain both the IP addresses linked to the sonicwall, as well as the currently logged in user of the machine as well.
What i am trying to create is a employee monitoring software (like Interguard/ActivTrak/etc), but am unable at present to even get near to finding this information?
I've been researching A LOT of stuff (~25 pages of google, with not a single link not clicked), and have met no conclusion as to get this information.
I'm not exactly a great programmer, but I would LOVE to be able to get this sort of information into two combobox's/arrays/other suitable object/control.
If anyone knows a way of even creating an array of IP addresses, along with corresponding Logins, that would be of great help to this project!
(PLEASE NOTE: I know there is a Networking exchange site, but I have already looked! Also, since i'm designing a piece of software for this, I thought i'd ask it here!)
Thanks for any advice/suggestions much appreciated!

What you looking for is similar to a packet sniffer application like wireshark or ethereal. But if you want to design it yourself, I think your best solution is a collection/list to store the data that is binded to a datagrid.

If you're in an Active Directory domain, you could use the code from my S/O question. Instead of using the CheckConnectionAsync() method to check for connectivity, you could just re-write it to get the IP address using System.Net.Dns.
To retrieve the user, you can use WMI. For this, you need to make a reference to the System.Management namespace.
public Task<string> GetUserName(string ComputerName)
{
return Task.Run(() =>
{
ConnectionOptions conn = ConnectionOptions()
{
EnablePrivileges = true,
Username = // string in format of #"DomainName\UserName",
Password = password,
Authentication = AuthenticationLevel.PacketPrivacy,
Impersonation = ImpersonationLevel.Impersonate
};
ManagementScope scope = new ManagementScope(#"\\" + ComputerName + #"\root\cimv2", conn);
try
{
scope.Connect();
ObjectQuery user = new ObjectQuery("Select UserName From Win32_ComputerSystem");
ManagementObjectSearcher searcher = new ManagementObjectSearcher(scope, user);
ManagementObjectCollection collection = searcher.Get();
foreach (ManagementObject m in collection)
{
string username = m["UserName"].ToString().Trim();
if(!String.IsNullOrEmpty(username))
{
return username;
}
}
return null; // no current logged in user
}
catch (Exception) // error handling...
});
}
Then, just iterate through your collection of computers and retrieve the username like so:
private async Task RetrieveUsers()
{
Parallel.ForEach(Computers, c =>
{
string user = await GetUserName(c.Name); // or c.IP. both work.
});
}

How to list all local computer user profiles in a combo box?

I need to enumerate all user profiles on a local computer and list them in a combo box. Any special accounts need to be filtered out. I'm only concerned about actual user profiles on the computer where the app is running. I have done some searching but I haven't found a clear answer posted anywhere. I did find some code that might work but SelectQuery and ManagementObjectSearcher are displaying errors in VS and I'm not sure what I need to do to make this work.
using System.Management;
SelectQuery query = new SelectQuery("Win32_UserAccount");
ManagementObjectSearcher searcher = new ManagementObjectSearcher(query);
foreach (ManagementObject envVar in searcher.Get())
{
Console.WriteLine("Username : {0}", envVar["Name"]);
}

By saying "SelectQuery and ManagementObjectSearcher are displaying errors" I guess you didn't reference the System.Management dll.
You should right click References in your solution and add System.Management.
Then, with your using statement, the errors should disappear.
Anyway, including the error next time will assist everyone to help you :)

The mentioned code is great but when I tried on a machine connected to a Active Directory Domain all the usernames where returned for the domain. I was able to tweak the code a bit to only return the users that actually have a local directory on the current machine. If a better C# developer can refactor the code to make it cleaner - please help!
var localDrives = Environment.GetLogicalDrives();
var localUsers = new List<string>();
var query = new SelectQuery("Win32_UserAccount") { Condition = "SIDType = 1 AND AccountType = 512" };
var searcher = new ManagementObjectSearcher(query);
foreach (ManagementObject envVar in searcher.Get())
{
foreach (string drive in localDrives)
{
var dir = Path.Combine(String.Format("{0}Users", drive), envVar["name"].ToString());
if (Directory.Exists(dir))
{
localUsers.Add(envVar["name"].ToString());
}
}
}
Once you have the localUsers variable you can set this as the data source to your ComboBox control of our choice.

Check Password Reset on Active Directory Server

I need to reset windows password of any user through my .Net application. I am using the user's username to get its Directory Entry from AD server. I got these two different methods for changing password :
entry.Invoke("ChangePassword", oldPass, newPass);
&
entry.Invoke("SetPassword", "pass#123");
But I am getting the following error when am trying these methods on live AD server :
Access is denied. (Exception from HRESULT: 0x80070005 (E_ACCESSDENIED))
I have 2 AD servers. One of them is live and another is for testing purpose. I just want to check if my code is working or not. Since, access is denied on live server I can not change and check later my own password through code.
And if I am using the test AD server to change password, I don't know how to check whether the pasword is changed or not.
Kindly give any suggestions to check if my code is working properly or not.
Thanks in advance.

I think you're not getting a proper context setup before you call the invoke. Here's what I use for something similar. You'll need to set your own variables:
I'm using System.DirectoryServices.AccountManagement to get the functions.
//Domain related info
string _DCToUse = "myserver.domain.local";
string _ADConDomain = "DC=domain,DC=local";
string _AdDomain = "domain";
string _ADAdminUser = "administrator";
string _ADAdminPass = "password";
//User specific
string _UserName = "jsmith";
string _CurrentPass = "oldPass";
string _NewPass = "newPass";
PrincipalContext principalContext =
new PrincipalContext(ContextType.Domain, _DCToUse,
_ADConDomain, _ADDomain+#"\"+_ADAdminUser, _ADAdminPass);
UserPrincipal user = UserPrincipal.FindByIdentity(principalContext, _UserName);
if (user == null)
{
string ADErrorMsg = "Couldn't find user, check your spelling.";
return Changed;
}
user.ChangePassword(oldPass, newPass);
user.Save();

Get fullname from Active Directory on C#

I have a problem about getting user's firstname and surname (fullname) from Active Directory. The code is below.
No problem with runing the project on my local. I can take data whatever I want. After publishing the project to remote server, it don't allow me to get firstname and surname (fullname), it just allows to get domain name and username. How can I fix it?
private string GetNameSurname()
{
string[] retVal;
//Pull the username out of the domain\user string.
retVal = Page.User.Identity.Name.Split(new string[] { #"\"},StringSplitOptions.RemoveEmptyEntries);
DirectoryEntry userEntry = new DirectoryEntry("WinNT://" + retVal[0] + "/" + retVal[1]);
string namesurname = (string)userEntry.Properties["fullname"].Value;
//return retVal[1];
//retVal[1] gives username.
//retVal[0] gives domain name
return namesurname;
}

Are you running the code to test for the same user?
Are you testing against AD in dev, Windows local accounts have a Full Name field (optional) but in AD the fields are named differently. Also, are you talking to the same version of AD.
According to the MSDN article there is no field called Full Name, only First Name and Surname and Display Name.

I think your problem is about credentials. Try to add an administrator username and password when conecting to active directory.

How do I retrieve the username that a Windows service is running under?

Given a service name, I would like to retrieve the username that it runs under (i.e. the username shown in the 'Log On' tab of a service's properties window).
There doesn't appear to be anything in the ServiceController class to retrieve this basic information. Nothing else in System.ServiceProcess looks like it exposes this information either.
Is there a managed solution to this, or am I going to have to drop down into something lower-level?

Using WMI, with the System.Management you can try the following code:
using System;
namespace WindowsServiceTest
{
class Program
{
static void Main(string[] args)
{
System.Management.SelectQuery sQuery = new System.Management.SelectQuery(string.Format("select name, startname from Win32_Service")); // where name = '{0}'", "MCShield.exe"));
using (System.Management.ManagementObjectSearcher mgmtSearcher = new System.Management.ManagementObjectSearcher(sQuery))
{
foreach (System.Management.ManagementObject service in mgmtSearcher.Get())
{
string servicelogondetails =
string.Format("Name: {0} , Logon : {1} ", service["Name"].ToString(), service["startname"]).ToString();
Console.WriteLine(servicelogondetails);
}
}
Console.ReadLine();
}
}
}
You can then later substitute the commented code with your service name, and it should only return the instances of your service process that is running.

WMI is your friend. Look at Win32_Service, specifically the StartName property. You can access WMI from C# via the System.Management.ManagementClass.
If you've not used WMI before, this article seems to be quite a good tutorial.

You can find this using the Windows Registry, reading the following string value, replacing [SERVICE_NAME] with the name of the Windows Service:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\[SERVICE_NAME]\ObjectName

Try this:
System.Security.Principal.WindowsIdentity.GetCurrent();
but the most obvious you will get LOCAL SYSTEM or NETWORK. The reason that you cannot show this user - that service can manage multiple users (shared by desktop, attached to current windows session, using shared resource ...)
System starts service, but any user can use it.

This solution works fine for me:
ManagementObject wmiService = new ManagementObject("Win32_Service.Name='" + this.ServiceName + "'");
wmiService.Get();
string user = wmiService["startname"].ToString();

public String getUsername() {
string username = null;
try {
ManagementScope ms = new ManagementScope("\\\\.\\root\\cimv2");
ms.Connect();
ObjectQuery query = new ObjectQuery
("SELECT * FROM Win32_ComputerSystem");
ManagementObjectSearcher searcher =
new ManagementObjectSearcher(ms, query);
foreach (ManagementObject mo in searcher.Get()) {
username = mo["UserName"].ToString();
}
string[] usernameParts = username.Split('\\');
username = usernameParts[usernameParts.Length - 1];
} catch (Exception) {
username = "SYSTEM";
}
return username;
}