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I was attempting to use a service with a filewatcher. I soon realized that the service ran as 'localservice'. Thus it had none of the rights of the logged on user. Nor could it access the users 'Local Data' path.
I also discovered that I couldn't run another VB.NET app from the service, cause the app was considered part of the service, making it impossible to run a normal app with a user interface. I began to understand that the service would not be able to access SQL - cause it's not a registered user.
Can anyone recommend a good book or examples of how to code services so they can impersonate the logged on user?
This seems so restrictive - what's the worth of a service to an everyday programmer?
My workaround is a system tray app, which works fine.
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dBrong wrote: My workaround is a system tray app, which works fine.
This app wont start automatically, i guess.
dBrong wrote: what's the worth of a service to an everyday programmer?
Anything that needs to be done in background, generally uses services as an application type. For example, Virus checking / removing softwares.
dBrong wrote: so they can impersonate the logged on user
Just change the local service account with the User account. This can be done using the service installer. Each time this service starts now, it will use the credentials provided by the user (User credentials). The credentials are asked for when service is installed.
Hope this solves your most problems ?
"A good programmer is someone who looks both ways before crossing a one-way street." -- Doug Linder
coolestCoder
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dBrong wrote: This seems so restrictive - what's the worth of a service to an everyday programmer?
Services are normally written as servers, like a web server, ftp server, smtp, ... They normally don't impersonate users unless there is a specific permission they need. In that case, a normal user account is created and the permissions on it specifically setup to give the service the rights it needs and no more.
If your app doesn't do anything until a user is logged in, it should be rewritten as a normal application, but one that puts it's interface in the system tray (NotifyIcon class). It'll normally launch from the Run key in the registry or from the All User\Startup folder. This way, it'll always run in the security context of the user that's logged in and you don't have to worry about user switching and impersonation.
dBrong wrote: I soon realized that the service ran as 'localservice'. Thus it had none of the rights of the logged on user. Nor could it access the users 'Local Data' path.
True. LocalSystem is the default account that a windows service runs under, having no rights to any network resources.
dBrong wrote: also discovered that I couldn't run another VB.NET app from the service, cause the app was considered part of the service, making it impossible to run a normal app with a user interface.
Services run under a different desktop thatn what the user sees, by default. So any forms or interface elements that you put up don't get shown on the visible desktop. They get shown on a sdesktop that you cannot see! There is a switch in the Services manager that allows a service using the LocalSystem account to show it's interface on the desktop though. You just need to get the Properties page of your service, go to the LogOn tab and you'll see it.
dBrong wrote: I began to understand that the service would not be able to access SQL - cause it's not a registered user.
Not true. It can't access an SQL database where the connection string is using "Trusted Connection", but it can if the login credentials are supplied for a valid SQL Server account. Access databases are file-based, so any access to one of these requires filesystem rights. If the database is stored on the network, you run into the first problem above. LocalSystem doesn't have network rights, so youre service has to use a user account specifically setup for it.
Dave Kreskowiak
Microsoft MVP
Visual Developer - Visual Basic
2006, 2007
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i am using vb.net 2003 and using datagrid to show my records in my table. after a month i switch to vb.net 2005 and i have problem in the event of double_click of datagridview of vb.net 2005.
this is my code in double_click event of vb.net 2003 using datagrid
txt1.text=datagrid1.item(datagrid1.currentrowindex,0).tostring
this is my code in double_click event of vb.net 2005 using datagridview
txt1.text=datagridview1.item(datagridview1.currentrow.index,0).tostring
my problem is. when i double click my datagridview in vb.net 2005 the value of my textbox is this "DataGridViewTextBoxCell { ColumnIndex=0, RowIndex=0 }"
but in vb.net 2003 is ok. i mean what ever the value of my index 0 in my table that is the value of my textbox. any idea why in vb.net 2005 give me an output like that. thx in advance
Don't block the drive way of all the newbies in programming. 
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The DataGridView is a completely different animal from the old DataGrid in 2003. The Items collection in the DGV returns, as you've found out, a DatGridViewTextBoxCell object, or whatever object type the column is, not the data inside it!
To get at the value that's displayed in the cell, you can use one of two things. Either the Value property of the returned DataGridViewTextBoxCell, or the FormattedValue (as displayed in the grid).
text1.text = dgv1.item(dgv1.currentrow.index,0).Value
Dave Kreskowiak
Microsoft MVP
Visual Developer - Visual Basic
2006, 2007
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Along those lines, could you help me out with this code that isn't working the way I want it to.
I am trying to insert new row(s) into a datagridview called "CustSalesOpportunityLineDataGridView" (that is databound to a table called "custsalesopportunityline" in a master-detail form that contains includes the header info as well).
I have also created a generic product selection form that contains a datagridview called "ArticleDataGridView" that displays all the info and contains the filters that users need to efficiently search and filter out products. The dataset for the "ArticleDataGridView" is based on a view that I have created in the database.
On the "ArticleDataGridView" I have created a column called "Select_Article" that is a DataGridViewCheckBoxColumn. (false value = 0, indeterminate = 0, true =1). If the users want to add a particular product to the SalesOpportunityLine datagridview they should be able to check the checkbox for each desired row and then click the AddAndContinueButton. The Select_Article checkbox column is the leftmost column of the datagridview.
For each product that they have selected in the articledatagridview a new row in the "CustSalesOpportunityLineDataGridView" should be created and displayed as well as the articleID, name and Salesopportunityheaderid.
Where am I going wrong with the code below? Based on the error messages I am getting I don't think it is reading from the correct column.
Private Sub AddAndContinueButton_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles AddAndContinueButton.Click<br />
<br />
For Each dgvRow As DataGridViewRow In Me.ArticleDataGridView.SelectedRows<br />
If Me.ArticleDataGridView.Item(ArticleDataGridView.CurrentRow.Index, 1).Value = 1 Then<br />
Dim dt As DataTable = Me.SalesOpportunity.Tables("custsalesopportunityline")<br />
Dim dtRow As DataRow = dt.NewRow()<br />
dtRow("Salesopportunityheaderid") = NewSalesOpportunity.SalesoppHeaderID<br />
dtRow("articleid") = dgvRow.Cells("ArticleIdDataGridViewTextBoxColumn").Value<br />
dtRow("work_articlename") = dgvRow.Cells("ProduktnavnDataGridViewTextBoxColumn").Value<br />
dt.Rows.Add(dtRow)<br />
<br />
End If<br />
Next<br />
<br />
End Sub
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thx for the Info Dave.
Don't block the drive way of all the newbies in programming.
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Hi, Can someone tell me what windows messages a UserControl receives when the parent (ie a vb form) is moved/minimized/maximized)? I tried subclassing the WM_MOVE, WM_MOVING messages but it doesn't seem to be sent.
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When the PARENT form is resizing?? None. About the only thing it will get are WM_PAINT messages, and if the form is dynamically resizing or moving controls, WM_SIZE, and/or WM_MOVE messages. Ther eis no message sent to the controls telling it the parent is being moved or it's window state changes.
Dave Kreskowiak
Microsoft MVP
Visual Developer - Visual Basic
2006, 2007
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Hi all,
I would like to know if there is a way to disable all date selections before the current date in the asp.net calendar control. The part to disable or strike-out the date should be something like this :-
<cal>.DayStyle.Font.Strikeout = True
<cal>.SelectionMode = CalendarSelectionMode.None
but how do we select all the dates < the current on which the above could be applied?
tks
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On the calender day render event you set the e.Day.IsSelected = False if you don't want the day selectable.
Here is an example from MS help:
Protected Sub Calendar1_DayRender(ByVal sender As Object, _
ByVal e As DayRenderEventArgs) Handles Calendar1.DayRender
Dim myAppointment As Date = New Date(2005, 10, 1)
If (e.Day.Date = myAppointment) Then
e.Day.IsSelectable = True
Else
e.Day.IsSelectable = False
End If
End Sub
Hope that helps.
Ben
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WORKS BEAUTIFUL!!!!!!!! thanks a lot Ben
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Hello all,
I have three tables:
Tablename 1: Agent
Collums:
Agentnumber (PK)
Agentname
Tablename 2: Agent_Group
Collums:
Agentnumber (FK, connection with Agentnumber of Agent table)
Groupnumber (FK, connection with Groupnumber of group table)
Tablename 3: Group
Collumns:
Groupnumber (PK)
Groupname
Now i need to show the names of the agents which belong to (for example) groupnumber 300.
This is the SELCECT statement i made:
SELECT Agent.Agentname
FROM (Agent_Group INNER JOIN
Agent ON Agent_Group.Agentnumber = Agent.Agentnumber)
WHERE (Agent_Groep.Groupsnumber = ?)
The "?" is a variable, called groupNumber.
Wen run the statement in the querybuilder i get some results bun when running the application i get the error message:
"An unhandled exception of type 'System.Data.ConstraintException' occurred in system.data.dll"
Maybee som extra info (in dutch):
Additional information: Beperkingen konden niet worden ingeschakeld. Een of meer rijen bevatten waarden die in strijd zijn met de beperkingen met betrekking tot niet-null waarden, unieke waarden of afwijkende sleutels.
The following statement works fine but then i see only the agentnumbers who belong to group 300.
SELECT Agentnummer, Groepsnummer
FROM Agent_Groep
WHERE (Groepsnummer = ?)
Somebody any idea?
Thanks
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This is a question for the SQL Forum.
The Babelfish translation is a bit rough, but, it would appear that you have a key constraint violation in your INNER JOIN. You shouldn't be allowing NULL's on the keys, primary or foreign, in either table. Also, is the data constistent? Do ALL of the FK values in the Agent_Group table actually exist in the PK's of the other two tables?
Dave Kreskowiak
Microsoft MVP
Visual Developer - Visual Basic
2006, 2007
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I am trying to find some VB .net 2005 code that will help me to read and pass individual records from an Access table to a (formated) Text file file. How do I write the individual lines? TIA
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You have to write your own parser for this. Fetch records from your access DB and insert them line by line in a Text file. See THIS for how to read/write data into a text file
Mubashir
Software Architect
Storan Technologies Inc, USA
Every job is a self portrait of the person who did it.
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Thanks Mubashir. I though that would be it, but I wondered if anyone already had some code scenarios that i could modify.
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That's not how this site works. We'll help you write your own code, we won't write it for you. Why?? Because you wouldn't learn anything if we did the work.
Dave Kreskowiak
Microsoft MVP
Visual Developer - Visual Basic
2006, 2007
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Thanks for the input and patience. Through trial and error, I am now in an advances stage of writing a custom parser (using the WriteLine method). Appreciate the help.
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Hello all,
I was just wondering if there is any way to make a form to minimize to the windows toolbar (the one with clock).
So, when minimized there will be an icon of the application next to the clock (bottom right) that is when i right click on it, there will be a menu showing.
Thanks
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Thanks Kubben 
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How To compare data in array A and array B
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Do U need this?
Using simple for loop
we can achieve this.
flag=true
for i=0 to n
if a(i) not equal to b(i) then
flag=false
next
if flag = false then
the arrays are not equal.
If U want something else other than this,
U will have to elaborate so that everyone can understand
what U really need.
Regards,
Arun Kumar.A
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