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Hi,
For my multiuser vb.net application i DONT want to use any commercial DBMS.
How do i use flat file system for a multiuser application.
Regards
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Very painfully - it's called Access. You can use your own files too, but...
I abhore using Access, or any other file-based database, for any multiuser system, but some other people have a different opinion. It can be done, but performance stinks, severly limiting scalability.
If your system has an unknown upper limit on the number of users, save yourself the trouble and go with the DMBS up front. You won't have to convert your Access "SQL" to Real "SQL" code later.
RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome
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MSDE is free, although it doesn't scale as well as SQL Server 2000. But Dave is right, do it properly, or don't do it at all.
Christian Graus - Microsoft MVP - C++
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Google for Sqlite. Its completely filebased, only some kilobytes in size and faster than Access. It has its issues but it can work very well (there is even a native .Net provider for it).
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There is also MySQL wich is becoming widely used and Free.
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I am sure we are all faced with SOX (Sarbenes & Oxly). I am looking for a program that will let me enter a date range and path, then it will create a report that provides me with a list of files that were created and/or modified during this date range. Ideally I would also like to be able to control what file extension the program looks for. Any help is appriciated ... I a newby to .NET.
THANKS!
GuateGerman
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this code is write by vb6 and it convert to vb.net, when I run it, it gets me error. is anybody knows hot to fix this or what should I code it in vb.net? Thanks!
Private Sub clearTextboxes()
Dim txt As System.Windows.Forms.Control
'Set each textbox's value to ""
For Each txt In frmMain.DefInstance.Controls
'UPGRADE_WARNING: TypeOf has a new behavior. Click for more: 'ms-help://MS.VSCC.2003/commoner/redir/redirect.htm?keyword="vbup1041"'
If TypeOf txt Is System.Windows.Forms.TextBox Then txt.Text = ""
Next txt
End Sub
Lisa
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You need to change out the TypeOf statement to something more .NET compatible.
Dim ctrl As Control
Dim txtBox As TextBox
For Each Control In frmMain.Controls
If Control.GetType().Equals(GetType(TextBox)) Then
txtBox = CType(Control, GetType(TextBox))
txtBox.Text = String.Empty
End If
Next
Or something very similar. I wrote this from memory so it may not compile without some tweaks.
RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome
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thanks..Dave.
I have another question to ask you. if I created textboxes, do I need to remove them when I use it again? when I resign the iStartIndex and iEndIndex and recall the sub textboxshow(), what should I do to make the second call shows correctly?
Private Sub textboxShow()
setStartIndex()
setEndIndex()
clearTextboxes()
MessageBox.Show(iStartIndex & "," & iEndIndex)
Dim I, J As Integer
Dim sData As Integer = 1
While sData <= iEndIndex
For I = 1 To 6
For J = 1 To 7
Call AddDataShow(sData, I, J)
sData += 1
Next
Next
End While
End Sub
Public Sub AddDataShow(ByVal sText As String, ByVal I As Integer, ByVal J As Integer)
Dim txtDataShow As New TextBox
Dim UserLft, UserTop As Integer
Dim X, Y As Integer
Dim a As Integer
a = sText - iStartIndex
UserLft = 20
UserTop = 80
txtDataShow.Height = 80
txtDataShow.Width = 80
txtDataShow.TextAlign = HorizontalAlignment.Left
txtDataShow.BorderStyle = BorderStyle.FixedSingle
'txtDataShow.BackColor = Color.White
txtDataShow.BringToFront()
If a > 0 And a <= iEndIndex Then
txtDataShow.Text = a
'MessageBox.Show(a)
Else
txtDataShow.Text = ""
End If
If txtDataShow.Text = "" Then
txtDataShow.BorderStyle = BorderStyle.None
Else
txtDataShow.BorderStyle = BorderStyle.FixedSingle
txtDataShow.BackColor = Color.White
End If
txtDataShow.Multiline = True
txtDataShow.ReadOnly = True
X = UserLft + (J - 1) * txtDataShow.Width
Y = UserTop + (I - 1) * txtDataShow.Height
txtDataShow.Location = New Point(X, Y)
'MessageBox.Show(X & "," & Y)
Me.GroupBox1.Controls.Add(txtDataShow)
End Sub
Private Sub clearTextboxes()
Dim ctrl As Control
Dim txtBox As TextBox
For Each ctrl In GroupBox1.Controls
If ctrl.GetType().Equals(GetType(TextBox)) Then
txtBox = CType(ctrl, Control)
txtBox.Text = String.Empty
End If
Next
End Sub
Lisa
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If the code generates textboxes to display data, and you use the same code to display new data, then either, yes, you'll have to delete the old textboxes because your code is going to create a new set of them, or, your code will have to know that it already created all the necessary textboxes and reuse them.
The first option is much easier to implement...
RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome
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how can I remove the dynamic textboxes? I have tried to remove it use controls.remove, but it doesn't work, it just remove all the textboxes when it load, then doing nothing. can you help me see what's wrong with it? Thanks a lot.
Dim tempCtrl As Control
For Each tempCtrl In GroupBox1.Controls
Groupbox1.Controls.Remove(tempCtrl)
Next tempCtrl
Lisa
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You're not checking the type of control your removing. On top of that, you can't modify a collection while your enumerating it, or using For/Each on it. You have to use an array index to do this. But, overall, it works the same as trying to clear the text boxes. Check the type of the control first, then remove it:
Dim ctrl As Control
Dim txtBox As TextBox
Dim i As Integer
For i = 0 to frmMain.Controls.Count - 1
If frmMain.Controls(i).GetType().Equals(GetType(TextBox)) Then
frmMain.Controls.RemoveAt(i)
End If
Next
RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome
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when I run it, it shows this error:
Specified argument was out of the range of valid values.
parameter name: Index 32 is out of range.
but the control.count shows result is 53, why it is out of range?
Lisa
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Hi,
I am aware that the VB.NET environment provides a wizard and associated functionality to faclitate the upgrade of VB 6.0 applications to VB.NET.
I wanted to know if this also works with earlier versions of VB like VB5.0 and 3.0. If not, is there any recommended approach for upgrading such applications?
Thanks for your help!
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Anonymous wrote:
I wanted to know if this also works with earlier versions of VB like VB5.0 and 3.0. If not, is there any recommended approach for upgrading such applications?
I never upgrade from version 5 or 3 of vb to vb.net. But if it is possible, try to upgrade your version 5 or 3 of your vb application to vb6 then upgrade it from vb6 to vb.net.
A thousand mile of journey, begin with the first step.
APO-CEDC
Save Children Norway-Cambodia Office
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I know it doesn't work with VB3. It MIGHT work with VB5, but you'll have to try it. But like the other poster said, you could upgrade the project in VB6 first, then load it into VB.NET. You'll have to clean up the code in VB6 first before you try VB.NET though.
RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome
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Hi,
I'm pretty new to VB and I'm trying to figure out how to use the loop command until I select a command button. Can someone help me out with this easy question? Thanks.
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Button in a Loop command? You don't. If your trying to wait for a button press in a loop, you're not following the event-driven programming model of Windows Forms.
What are you trying to do with this button click in a loop? Are you waiting for an OK or something?
RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome
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I have a selection loop running. What I have envisioned is allowing the user to pick items out of a CAD window until the user selects the command button I labeled "OK". I hope I explained myself correctly.
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Change your form so that when the user clicks on OK, the event handler for the button finishes the processing of the objects the user selects.
RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome
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Exactly how do I do that? Sorry, I really don't know how that's done.
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What are you talking about? The code you were going to run after the loop where you wanted to wait for a button click? That goes in the Click event handler for the OK button you wanted your users to click when they were done, right?
RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome
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Yes, you're right, but what I'm looking for is what command needs to be typed following the Do Until to allow for the user to select one of the command buttons on the form. When I pass the focus to the application where the user is going to be selecting elements and when they're done selecting and try to pick the "OK" button I get an error message saying something like the application is busy, Switch To, and Retry buttons are my only choice.
Do Until ???????? - what command - ?????
Select Element code......
Loop
Forgive me, I'm new......
Thanks for your time and help.
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You're not listening. You CANNOT do this at all! There is NOTHING you can put in this loop that will allow you to do what you want.
You MUST rewrite your form to do whatever it needs to before the user gets to select any element. AFTER the end of that function is where the user will select whatever elements you want them to, then click the OK button. In the Click event of the OK Button, then you can finish processing.
YOU ABSOLUTELY CANNOT RESPOND TO BUTTON CLICK EVENTS WHILE A LOOP IS EXECUTING.
RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome
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ROTFL - this made my morning brighter.
However, can't he run his loop in a seperate thread and have a UI thread stop it ?
Christian Graus - Microsoft MVP - C++
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