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If you're under VS2005/FW2 then it's very easy. There's a specific Application event that pop ups whenever network connection status changes.
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It has been mentioned that .NET Framework 2.0 has the smarts to do this. Here's a brief rundown on what is required. I found the basis for this post at The Occasionally Connected Application[^].
I just setup a simple one-form app which had one label on it. The label is changed to "Connected" or "Not Connected" depending on the state of the network. The initial state is detected via this code in the Form_Load event ...
Private Sub Form1_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
If My.Computer.Network.IsAvailable = True Then
lblConnectedStatus.Text = "Connected"
Else
lblConnectedStatus.Text = "Not Connected"
End If
End Sub
Now we need to dynamically test the connection state. This is done by creating an event handler for the NetworkAvailabilityChanged in the MyApplication class ...
Private Sub MyApplication_NetworkAvailabilityChanged(ByVal sender As Object, ByVal e As Microsoft.VisualBasic.Devices.NetworkAvailableEventArgs) Handles Me.NetworkAvailabilityChanged
If e.IsNetworkAvailable = True Then
My.Forms.Form1.lblConnectedStatus.Text = "CONNECTED"
Else
My.Forms.Form1.lblConnectedStatus.Text = "Not Connected"
End If
End Sub
This passed most of the unplug / disable tests. Use this in conjunction with the new Ping functions in 2.0 and you may have a viable solution.
...Steve
"Give a man a fish and you've fed him for a day. Teach him how to fish and you've fed him for life." (Translation: I'll show you the way, but not write the code for you.) I read that somewhere once 
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Hi, I would like to use marquee in my program. Can its function be implemented in any of the control? How?
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Yes, you can write a control that does marquee. Or if you google, I'm sure that one exists.
Christian Graus - Microsoft MVP - C++
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You could type "marquee" in the search box at the top of this page and find, as the second article, A marquee control in C#. You could just use the control, or translate it to VB.NET, usually a pretty trivial (and tedious) exercise. Just make sure to attribute the original author.
"we must lose precision to make significant statements about complex systems."
-deKorvin on uncertainty
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Hi,
i am using this site for a long time and i m a fan of this site. In our firm we have developed a web spider which can be downloaded at http://unicornsoftbd.com/download/index.php for free. If you use this web spider and give us a feed back,it will encourage us.If any of u want the source code please contact at info@unicornsoftbd.com.Thank u all.
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I'm glad you find The Code Project a worthwhile resource. It has some great advice, code and help from many, many experienced developers.
Why not share your code on The Code Project, or even write an article with your web spider as the subject? That would put back a lot more into this community than simply advertising your own code on this board.
...Steve
"Give a man a fish and you've fed him for a day. Teach him how to fish and you've fed him for life." (Translation: I'll show you the way, but not write the code for you.) I read that somewhere once
-- modified at 18:50 Monday 12th December, 2005
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Thank you for your quick repply.Actually i dont know how to post or publish an article in code project(though i use it... .If you give me this information i will gladly post this article in code project.
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Have a look at How to submit an article.
"we must lose precision to make significant statements about complex systems."
-deKorvin on uncertainty
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I can successfully create registry keys (createkey)in debug mode of my project, but the key values set with (SetKey) don't seem to change, they always show up as default 0 when inspecting with regedit. The keys are there, but the values are always 0. I tried flush and close. I have tried rebooting and still the values are default 0 in regedit.
Crazy thing is, when changing the registry values through my project UI, they appear to succesfully change in the UI, even after reboot of the computer, but when I go to look in Regedit, the default 0 is still there. Does VS work with a copy of the registry that will not show up in regedit???
Thanks,
Depotdog
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I'm using the System.net.WebClient class to post a file as http through the company firewall to an external company.
To get throught the firewall I need to set the proxy creadentials. For http this works fine. My question is that if I want to send over https and need to set basic authentification for the destination system, how do I specify that? Not pretty but can I include it in the pDestination string? If I set the Credentials property of the WebClient object does that overwrite the proxy credentials?
' set proxy
Dim vProxy As WebProxy = System.Net.WebProxy.GetDefaultProxy
vProxy.Credentials = New NetworkCredential(vUsername, vPassword, vDomain)
GlobalProxySelection.Select = vProxy
' send file as http(s)
Dim vWebClient As New System.Net.WebClient
vResponseArray = vWebClient.UploadFile(pDestination, "POST", pFilePath)
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well i have made a form which has buttons on it which link to different .exe, but i want to be able to add more button when i need to E.G. when i install a new game. without going in to Vb. on the form i want to be able to add and delete.
i also want to know how to make this form once completed run when windows start up.
p.s im using Microsoft Visual Basic 2005 Express Edition
-- modified at 8:53 Monday 12th December, 2005
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HI!
You can create a new instance of the Button-class. Here an example:
' Counter for all buttons
Dim liButtonCount As Integer = 0
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
' create new button
Dim foNewButton As New System.Windows.Forms.Button()
With foNewButton
' give the new object a name to find out which button pressed later
.Name = "NewButton" + liButtonCount.ToString
' set some properties like text, size and location
.Text = "NewButton " + liButtonCount.ToString
.Location = New System.Drawing.Point(1, liButtonCount * 40)
.Size = New System.Drawing.Size(120, 40)
.Visible = True ' set it as visible
' add the new button to the control list of the container (the formular)
Me.Controls.Add(foNewButton)
' add the destination sub to the event handler of the button (execute sub when get fired)
AddHandler .Click, AddressOf NewButtons_Click
End With
' increment the counter for the next new button
liButtonCount = liButtonCount + 1
End Sub
' multiple event sub for all dynamical created buttons
Private Sub NewButtons_Click(ByVal sender As Object, ByVal e As System.EventArgs)
' just to work easier with the object
Dim loButton As System.Windows.Forms.Button = sender
' find out which button was pressed
Select Case loButton.Name
Case "NewButton0" : MessageBox.Show("This is new Button number 0")
Case "NewButton1" : MessageBox.Show("And this is new Button number 1")
' you can go on like this for every button...
End Select
End Sub
I hope I could help you! If you need more help with it, just let me know!
Marcel Erz
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1. you asked this yesterday
2. the answer remains the same.
First of all, to do this you need to add some sort of config file. How else can you edit what the program does without editing the program
Secondly, what you're doing is really dumb. Just create shortcuts to your games and put them in a folder on the desktop if you want them all linked to one place.
And finally, as you were told yesterday, you add your program to the startup folder on the start menu and it will run on startup.
If you can't understand the answer, ask whoever gave it to you, don't repost the question.
Christian Graus - Microsoft MVP - C++
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I have:
Combo1.AddItem "15", 0
Combo1.AddItem "22.5", 1
Combo1.AddItem "40", 2
Combo1.AddItem "50", 3
Combo1.AddItem "62.5", 4
Combo1.AddItem "75", 5
Combo1.AddItem "90", 6
and when the code runs I want to see the item "40" showing in the combobox. It should also know that the index of this item is 2.
thnaks,
sb
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Hi!
Just use the Listindex-property! Example:
Combo1.Listindex = 2
This example will select the 3. entry in the list, like you wanna do it. But be sure that there are enough entries in the list.
Marcel Erz
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Combo1.ListIndex=2
That's it.
Amin.
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Ah!
Many thanks. I googled to no avail...
sb
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Dear dost
I've created dll in vb.net and used it in ASP pages.I got success.but now I've to modify this dll and again iI have to use it.I modified dll file and made it's dll by building it in vb.net.then I followed the sam procedure which I followed last time.but in result it's showing me privious result only.If I delete this file from system32 folder even though it's working.
so plssssssssss tell me how can I use the modified dll in ASP pages.
Thanks in advance.
Uttam Kumar 
try to be the best... whereever you go,
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You can not just overwrite the old DLL, since you are trying to do this through COM interfaces. You first need to unregister your old DLL from the system with regasm and then register the new version. Otherwise you could get problems with multiple versions.
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Hi dear
i've created a dll ile using vb.net.when I build it first time it got built successfully.but after some modification in my file if I do the same i.e(builting solution) it gives me error as follows.
unable to write output file 'c:\vb.net\dllkeysearch.pdb':Access id denied.
could u pls tell me how can i get rid of this error.and why it is happening?
Thanking you!
Uttam Kumar
try to be the best... whereever you go,
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You're getting this error because the .DLL is locked by another process. It's being used by some other application. Perhaps another part of your project?
Did you set a reference to this .DLL file directly, or reference the project that generated this .DLL? You're MUCH better off using the project reference. You already found out why.
RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome
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Thanks for yur answer Mr. Dave
Uttam Kumar
Convonix.inc
try to be the best... whereever you go,
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Hi To all,
can Anyone give me example of code to generate a html report in Vb 6.0 .
Thanks In Advance
manoj
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Dear tusar123
the best way to export ur report in html file is to create an html file and create table store ur data. but while saving u must save it with .html extension.use the following code to create a file and open it in word format.
code for writing in data
imports system.io
dim fname as string
dim ofile as filestream
dim owriter as streamwriter
fname = "search.html"
ofile = New FileStream(fname, FileMode.Create, FileAccess.Write)
owriter = New StreamWriter(ofile)
owriter.write("ur html code goes here")
owriter.close
owriter=nothing
ofile=nothing
code for opening it in web browser
System.Diagnostics.Process.Start("search.html")
I've tried it in vb.net.try same way in vb.
Happy Programming;P
Thanks n Regards
Uttam Kumar 
try to be the best... whereever you go,
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