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I know there is a way to specify that any items in the combobox should not be removed during binding. I did this in an asp.net app not long ago but I dont have access to the code at the moment...
Basicly you add the empty string to the combo set the (at the moment unknown) property not to clear the combo and then you do the databinding.
Workaround: Do the databinding and then: CBPersonnel.Items.Insert(0,"")
BR
Fredrik
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I just do what you said, if i put after the data binding it show an error but if i put before binding the data the form is running ok but nothing happens the data is still the same
is there anyway else to do that?
Abbas
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Hello All,
Has anyone got any code/pointers that would help me to retreive site/subnet information from Active Directory Sites and Services using VB.NET 2003. Have been searching the net in vain.
Thanks in advance for any replies
Scott
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I am making one application in VB6.
I want to find out that whether the flash plug in for IE is installed in the current machine or not.
Can anyone suggest a way for this? 
Regards,
Ketan.
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When I start up my app, I would like the main form to take up the entire screen (maximize). I know in VB6, you could do vbMaximize. How do you do this in VB2k5?
Thanks!!!
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In the forms property viewer set the WindowState property to Maximized or at runtime add Me.WindowState = Maximized
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hi all..
i have a problem in communication software to hardware.. actually, i want to know the basic concept how we send the data to the hardware using serial port.. for example, how can i switch on and off the led when i click the button in my vb projects..
can someone please help me..
areon25
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Then you must know how the hardware reads the data. Meaning you must know the communication protocol. What type of hardware is it?
BR
Fredrik
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thanks for the email..
actually, i just want to switch ON/OFF the LED as i mention before..
areon25
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And that't when it gets messy!
In order to swith on/off the led on the hardware you must send the correct data on your serial port.
I have written some protocols before for serial comunication and they all start with a command sequence. In your case I would have had a command LED_CONTROL which would have been the character "L" and then which state to put the led in "0" or "1".
By sending "L" on the serial port the hardware knows that next character recieved will contain "0" or "1" and when I send "0" the hardware swithces the led off.
Two weeks ago I wrote a program to print stickers with a Intermec PC4 printer.
http://www.intermec.com/eprise/main/GSS/Service/Content/Manuals/Show_ManualSearchResults?Product=PRTRPC4&Language=English[^]
Take look at the Programmer's Reference Manual.
That's why you must know the protocol for the hardware communication.
BR
Fredrik
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i have problem with sending email in windows application, can anyone give me example?
................
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It would be much better if you explained what the problem was.
Dave Kreskowiak
Microsoft MVP - Visual Basic
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Dave Kreskowiak wrote: It would be much better if you explained what the problem was.
agreed.
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Dim objEmail As New MailMessage()
..
..
I don't know how to do next
................
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Look at MSDN, they have numerous examples about EMail...
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I'm assuming you're using VB.NET 2005... MailMessage[^] docs, complete with an example of how to use it.
Dave Kreskowiak
Microsoft MVP - Visual Basic
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Hello,
I have this sub:
Sub ConDB()
Dim oSqlCliCon As SqlConnection
oSqlCliCon = New SqlConnection("Data Source=120.260.9.8;Integrated Security=SSPI;Initial Catalog=pubs")
Try
oSqlCliCon.Open()
Catch ex As Exception
msgbox(ex.Message)
End Try
oSqlCliCon.Close()
End Sub
The problem:
The code works for VB6/VBNET/VBNET2003 for SQL SERVER
for VBNET2005 works only local but for the SQL SERVER don't.
The exception message:
Timeout expired. The timeout period elapsed prior to completion of the operation or the server is not responding.
The exception message if modify the connectionstring:
An error has occurred while establishing a connection to the server. When connecting to SQL Server 2005, this failure may be caused by the fact that under the default settings SQL Server does not allow remote connections. (provider: Named Pipes Provider, error: 40 - Could not open a connection to SQL Server)
Please help, thank you.
gangeles
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Your question doesn't make much sense. Are you trying to connect to a SQL Server 2005 database?? If so, you have to go into the SQL Server configuration manager and turn on TCP/IP connections. By default, an SQL Server 2005 installation will only accept connections from applications running on the machine the server is installed on.
Dave Kreskowiak
Microsoft MVP - Visual Basic
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Dave thank you for your response,
We work with VB6, VB.NET, VB.NET.2003 and the last VB.NET.2005
We try to walk with the technology.
When work with VB6, VB.NET, VB.NET.2003 don't have problem, what I can say, we don't to change nothing because works fine.
But, since install VB.NET.2005 and try to do an application don't can stablish a conexion to the server.
So, we don't need to change the configuration but meaby vb.net.2005 requieres to change, and we don't have the config to change, I look on sql-server-tool and have de TCP/IP added (enabled), you refer to this?
The NET
Principal Server (have the DB)
Have a Domain
We attach to the domain
I test on two ways from client to server and server to client to stablish conexion but don't stablish.
Hope that you can help us
gangeles
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There's nothing to change!
You might want to look into making sure that you have the latest MDAC[^] installed.
Dave Kreskowiak
Microsoft MVP - Visual Basic
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Dave
Than you again for your response.
Exactly, we now test with the 3 forms to connect:
1. Standard Security
2. Trusted Connection
3. Connect via an IP address
(referer : http://www.connectionstrings.com/)
So, we have 3 more servers and try to connect to them, but only one server failed to connect.
I think like you is a configuration (meaby SQL server) or software to install problem, but We don't know what it´s.
We can follow like first step the MDAC
gangeles
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I'm a new programmer. I would like to know the code for a cascading menu like you see in windows. Thanks.
Dodz
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Hey, everybody.
I have a panel within a user control that I need to add link labels to. During runtime, the user selects an item from a combo box and based on which item is selected a list of filenames is returned from a database which are then respectively and dynamically made into link labels and added to the panel.
My problem is that I'm new to VB as a whole and I'm ignorant as to how one can add events to dynamically-created controls. In this instance, I would need to know when one of the link labels is clicked and which one was clicked.
Below is the code I have currently which works correctly to populate the panel with the link labels. Any help would be greatly appreciated. Thank you!
If (strSourcePath.Contains(",")) Then
strFilePaths = strSourcePath.Split(",")
nNumFiles = strFilePaths.Length
ReDim xLinkList(nNumFiles)
Dim nCount As Integer
For nCount = 0 To nNumFiles - 1
strFileNames = strFilePaths(nCount).Split("\")
xLinkList(nCount) = New LinkLabel()
xLinkList(nCount).Name = "lnkLabel" & nCount
xLinkList(nCount).Text = strFileNames(4)
Next
Else
nNumFiles = 1
If (System.IO.File.Exists(strSourcePath)) Then
strFileNames = strSourcePath.Split("\")
xLinkList(0) = New LinkLabel
xLinkList(0).Name = "lnkLabel"
xLinkList(0).Text = strFileNames(4)
End If
End If
panFiles.Controls.AddRange(xLinkList)
Dim i As Integer
For i = 0 To nNumFiles - 1
panFiles.Controls.Item(i).Dock = DockStyle.Top
Next
-- modified at 17:40 Tuesday 11th July, 2006
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Take a look at the AddHandler method.
Something like this..... (code from memory so usual warranty applies  )
If (strSourcePath.Contains(",")) Then
strFilePaths = strSourcePath.Split(",")
nNumFiles = strFilePaths.Length
ReDim xLinkList(nNumFiles)
Dim nCount As Integer
For nCount = 0 To nNumFiles - 1
strFileNames = strFilePaths(nCount).Split("\")
xLinkList(nCount) = New LinkLabel()
xLinkList(nCount).Name = "lnkLabel" & nCount
xLinkList(nCount).Text = strFileNames(4)
AddHandler xlinkList(nCount).Click AddressOf ClickHandler
Next
Else
nNumFiles = 1
If (System.IO.File.Exists(strSourcePath)) Then
strFileNames = strSourcePath.Split("\")
xLinkList(0) = New LinkLabel
xLinkList(0).Name = "lnkLabel"
xLinkList(0).Text = strFileNames(4)
AddHandler xlinkList(0).Click AddressOf ClickHandler
End If
End If
panFiles.Controls.AddRange(xLinkList)
Dim i As Integer
For i = 0 To nNumFiles - 1
panFiles.Controls.Item(i).Dock = DockStyle.Top
Next
Private Sub ClickHandler(sender As Object, e As EventArgs)
MessageBox.Show(DirectCast(sender, LinkButton).Name)
End Sub
My Blog[^]
FFRF[^]
-- modified at 17:55 Tuesday 11th July, 2006
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Awesome and thank you!
AddHandler xlinkList(0).Click, AddressOf ClickHandler worked like a charm. Additionally, I didn't know about the DirectCast method in VB so I was able to use that for other purposes as well to simplify my work. For those interested, the following is how I wrote my event handler for the dynamically-created link labels:
Private Sub LinkClick(ByVal Sender As Object, ByVal e As EventArgs)
nCurrFileNum = DirectCast(Sender, LinkLabel).Name
strCurrFile = DirectCast(Sender, LinkLabel).Text
Dim webURL As New Uri(strDefaultPath + strCurrFile)
webMain.Url = webURL
End Sub
Where:
nCurrFileNum is the current file number we are currently working with
strCurrFile is the current filename (and just the filename - not the path)
strDefaultPath is the default (read from the database) path to the files
webMain is the webcontrol used within the user control to show the .pdf files
Thank you for the help!
-- modified at 9:42 Wednesday 12th July, 2006
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