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Is the hard-drive serial number with WMIService CHANGEABLE?

I use Hard-Drive Serial-Number check to register my products.
But I see that sometimes it's being changed.
Just 2 weeks after the client has activated the product, the hard-drive Serial-Num changed.
Is this property changeable? and if so, how when and why is it changed?
Here is the code i use in VB:
Dim WMIService As Object, Items As Object, SubItems As Object, temp
Set WMIService = GetObject("winmgmts:\\" & "." & "\root\cimv2")
Set Items = WMIService.ExecQuery("Select * from Win32_PhysicalMedia", , 48)
For Each SubItems In Items
temp = SubItems.SerialNumber
If LenB(temp) Then Exit For
Next
and the same thing i use in C#
using System.Management;
public string GetHDDSerial()
{
ManagementObjectSearcher searcher = new ManagementObjectSearcher("SELECT * FROM Win32_PhysicalMedia");
foreach (ManagementObject wmi_HD in searcher.Get())
{
// get the hardware serial no.
if (wmi_HD["SerialNumber"] != null)
return wmi_HD["SerialNumber"].ToString();
}
return string.Empty;
}

Thanks to the comment from FunThomas and after a little troubleshooting with my client, i found out that he is using sometimes an external drive for more space, and when the external drive is plugged in - i'm getting a different HDD Serial-number.
Now i have figured how to get the serial number from the current drive letter.
here is the code for VB:
Dim WMIService As Object, DiskDrives As Object, Drive As Object, DiskPartitions As Object, Partition As Object, SerialNumber, currentDrive
currentDrive = Environ("HomeDrive")
Set WMIService = GetObject("winmgmts:\\" & "." & "\root\cimv2")
Set DiskPartitions = WMIService.ExecQuery("ASSOCIATORS OF {Win32_LogicalDisk.DeviceID='" & currentDrive & "'} WHERE ResultClass=Win32_DiskPartition")
For Each Partition In DiskPartitions
Set DiskDrives = WMIService.ExecQuery("ASSOCIATORS OF {Win32_DiskPartition.DeviceID='" & Partition.DeviceID & "'} WHERE ResultClass=Win32_DiskDrive")
For Each Drive In DiskDrives
Debug.Print "Caption: " & Drive.Caption, "Description: " & Drive.Description, "Name: " & Drive.Name, "Model: " & Drive.Model, "SerialNumber: " & Drive.SerialNumber
SerialNumber = Drive.SerialNumber
Next
Next

Formatting a WQL Output in C#

I'm trying to build a query, to list all the known computers in SCCM with a specific name.
The query looks like this:
string query = string.Format("Select Name From SMS_R_System Where Name like '" + "%" + computerName + "%" + "'");
If results are found, it puts the result(s) in a dropdown box.
My problem in these case, the output looks like this:
"instance of SMS_R_System{Name = "DC01";};"
But of course, for our use case we only need DC01 as output.
Any tips?
The full Code for the ButtonEvent:
private void ChkBtn_Click(object sender, EventArgs e)
{
string computerName = PCDropDown.Text;
lBox.Items.Clear();
SmsNamedValuesDictionary namedValues = new SmsNamedValuesDictionary();
WqlConnectionManager connection = new WqlConnectionManager(namedValues);
// Connect to remote computer.
try
{
connection.Connect(PrimarySiteServer.ToString());
// Set the query.
string query1 = string.Format("Select Name From SMS_R_System Where Name like '" + "%" + computerName + "%" + "'");
string query2 = string.Format("Select * From SMS_UserMachineRelationship WHERE ResourceName like '" + "%" + computerName + "%" + "' AND IsActive = '1' AND Types = '1'");
// Get the query results
IResultObject queryResults = connection.QueryProcessor.ExecuteQuery(query1);
// Check for results and display in infobox
bool resultsFound = false;
foreach (IResultObject queryResult in queryResults)
{
resultsFound = true;
lBox.Items.Add("Rechner ist vorhanden");
PCDropDown.Items.Add(queryResult.ToString());
}
if (resultsFound == false)
{
lBox.Items.Add("Rechnername nicht gefunden");
}
}
catch
{
MessageBox.Show("No Connection to Config-Manager - Als ZZA ausgeführt? SCCM-Servername richtig?");
}
}

Instead of adding queryResult.ToString() like you do here:
PCDropDown.Items.Add(queryResult.ToString());
you need to add the correct field of queryResult, so in this case:
PCDropDown.Items.Add(queryResult["Name"].StringValue);
Also a quick note. I don't know for who you are writing this and what the next step would be but if this is a read only application that is only used by SCCM Admins I would consider ignoring WMI and going to the SCCM DB via SQL instead. It is a lot faster, SQL has far more powerful options for queries and it does not need the integration of those strange sccm console Dlls (although that is not 100% necessary for WMI either).
If you need write access to create devices or collections etc., or you need to work with the roles the sccm access rights systems implements however WMI is the better or only choice. (And in this case I'd rather really use those strange dlls because all of the MS examples rely on them and it can be hard to translate those tutorials to the vanilla WMI solution C# offers.

Error with Query from the System Table

I want ask you one problem that I have with one query to the System table.
This is the code that I have wrong.
string current_query = "*[(System[TimeCreated[#SystemTime > '" + dateini + "']]) and (System[TimeCreated[#SystemTime < '" + datenext + "']])]";
Console.WriteLine(current_query);
EventLogQuery eventsQuery = new EventLogQuery(log_location, PathType.FilePath, current_query);
EventLogReader logReader = new EventLogReader(eventsQuery);
The dateini and datenext are DateTime variables.I think that the problem is that I read the table two times. But I need read two times because I need obtain the logs of the System of one full day and I think I must compare between two System Times.
Any suggestion that how remake the consult.
UPDATE:
I try this query with the same result.
string current_query = "*[(Event/System/TimeCreated/#SystemTime > " + dateini + ") and (Event/System/TimeCreated/#SystemTime < " + datenext + ")]";
Console.WriteLine(current_query);
EventLogQuery eventsQuery = new EventLogQuery(log_location, PathType.FilePath, current_query);
EventLogReader logReader = new EventLogReader(eventsQuery);
Please I need help because I don't know which is the error in the Query.

TimeCreated is of the form:
<TimeCreated SystemTime="2013-08-15T16:21:21.000000000Z" />
is your datetime correct?
Shouldn't the query be more like:
Event/System/TimeCreated/#SystemTime
See MSDN and reading-event-logs-efficiently-using-c for some examples.
EDIT
Why are you using > and lt; ? Change lt; to <
This turned out to be the problem.

Update DATETIME column where said DATETIME < current DATETIME

I've got an ASP.NET 4.0 C# web application that allows multiple users to update rows in the SQL Server DB at the same time. I'm trying to come up with a quick system that will stop USER1 from updating a row that USER2 updated since USER1's last page refresh.
The problem I'm having is that my web application always updates the row, even when I think it shouldn't. But when I manually run the query it only updates when I think it should.
This is my SQL query in C#:
SQLString = "update statuses set stat = '" + UpdaterDD.SelectedValue +
"', tester = '" + Session["Username"].ToString() +
"', timestamp_m = '" + DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss.fff") +
"' where id IN (" + IDs + ") and timestamp_m < '" + PageLoadTime + "';";
And here's a 'real world' example:
SQLString = "update statuses set stat = 'PASS', tester = 'tester007',
timestamp_m = '2013-01-23 14:20:07.221' where id IN (122645) and
timestamp_m < '2013-01-23 14:20:06.164';"
My idea was that this will only update if no other user has changed this row since the user last loaded the page. I have formatted PageLoadTime to the same formatting as my SQL Server DB, as you can see with DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss.fff"), but something still isn't right.
Does anyone know why I get two different results? Is what I want to do even possible?

I really think the problem is that the page load time is not being set correctly, or is being set immediately before the DB call. For debugging, you may try hardcoding values into it that you know will allow or disallow the insert.
Here's a parameterized version of what you have. I also am letting the DB server set the timestamp to its current time instead of passing a value. If your DB server and your Web server may not have their time of day in synch, then set it yourself.
Using parameterization, you don't have to worry about whether the date/time format is correct or not. I don't know what the DB types are of stat, tester, and timestamp_m so adding the parameter DB type may need adjusting.
string sql = "update statuses set stat = #stat, tester = #tester" +
", timestamp_m = getdate()" +
" where id IN (" + IDs + ") and timestamp_m < #pageLoadTime";
SQLConnection conn = getMeASqlConnection();
SQLCommand cmd = new SQLCommand(sql, conn);
cmd.Parameters.Add("#stat", System.Data.SqlDbType.NVarChar).Value = UpdaterDD.SelectedValue;
cmd.Parameters.Add("#tester", System.Data.SqlDbType.NVarChar).Value = Session["Username"].ToString();
// Here, pageLoadTime is a DateTime object, not a string
cmd.Parameters.Add("#pageLoadTime", System.Data.SqlDbType.DateTime).Value = pageLoadTime;

DirectoryEntry Page Size limit

The code below works just fine, however what's happening is the code limits the results to 1500 users and we have more than 1500 users. What I'm trying to do is retrieve a list of all users that are a member of a specific group. I know DirectorySearcher has a PageSize setting however, I'm unable to find a way to set DirectoryEntry PageSize will still only pulling members of that group.
Does anybody know a way to change the page size? Or maybe how to pull members of a specific group in another fashion that will accommodate pagesize?
DirectoryEntry dEntryhighlevel = new DirectoryEntry("LDAP://CN=Users,OU=MyOu,OU=Clients,OU=Home,DC=bridgeTech,DC=net");
foreach (object dn in dEntryhighlevel.Properties["member"])
{
DirectoryEntry singleEntry = new DirectoryEntry("LDAP://" + dn);
DirectorySearcher dSearcher = new DirectorySearcher(singleEntry);
//filter just user objects
dSearcher.SearchScope = SearchScope.Base;
//dSearcher.Filter = "(&(objectClass=user)(dn=" + dn + "))";
//dSearcher.PageSize = 1000;
SearchResult singleResult = null;
singleResult = dSearcher.FindOne();
if (singleResult != null)
{
string Last_Name = singleResult.Properties["sn"][0].ToString();
string First_Name = singleResult.Properties["givenname"][0].ToString();
string userName = singleResult.Properties["samAccountName"][0].ToString();
string Email_Address = singleResult.Properties["mail"][0].ToString();
OriginalList.Add(Last_Name + "|" + First_Name + "|" + userName + "|" + Email_Address);
}
singleEntry.Close();
}

This came up in another thread recently: Always getting 1500 member of distribution list using PowerShell
In short, you want to use ranged retrieval to get the membership. This is the mechanism designed to help you fetch large attributes with >1500 values in them.
While we're on this topic, I'd like to predict your next thread. :) Reading the membership of the group will yield missing results depending upon the API you use. If you are "close to the metal" and using LDAP APIs, you'll find that users in the group due to primary group membership will be missing. I'd test this with whatever approach you use after resolving the ranged retrieval issue to ensure you don't miss anyone.
More info on this here: retrieving group members/membership from active directory when members attrib doesn't work

I'm working on something similar to this at the moment and noticed that your code differs to mine slightly. I haven't had any issues with limited results using the following code structure:
DirectoryEntry dEntryhighlevel = new DirectoryEntry("LDAP://CN=Users,OU=MyOu,OU=Clients,OU=Home,DC=bridgeTech,DC=net");
DirectorySearcher dSearcher = new DirectorySearcher();
//filter just user objects
dSearcher.Filter = "(objectClass=user)";
dSearcher.PageSize = 1000;
SearchResultCollection resultCollection = dirSearcher.FindAll();
foreach (SearchResult userResults in resultCollection )
{
string Last_Name = userResults .Properties["sn"][0].ToString();
string First_Name = userResults .Properties["givenname"][0].ToString();
string userName = userResults .Properties["samAccountName"][0].ToString();
string Email_Address = userResults .Properties["mail"][0].ToString();
OriginalList.Add(Last_Name + "|" + First_Name + "|" + userName + "|" + Email_Address);
}
That should return all your users. You'll need to use LDAP search patterns in your dSearcher.Filter in order to narrow users down to a specific group - see this link for some additional help with that.