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AFAIK, you cannot compare two datasets directly.
However, if you load (or merge) the datatable from datasetA to datasetB, you can build a foreign key constraint (or constraints) between the two tables. With that you get an exception if rows don't match.
The need to optimize rises from a bad design.
My articles[ ^]
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yeah, thats a good point... thanks
Sebastian
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You're welcome.
The need to optimize rises from a bad design.
My articles[ ^]
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How are you. Please help me on connecting to access using vb6.0 and to also save the data into access using vb6.0?
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Your question has been answered, thousands of times, over the last 10 years. All it takes is a little searching to find the answers. Here[^].
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Dave Kreskowiak wrote: HereGoogle it[^].
Fixed that for you. 
Never underestimate the power of human stupidity
RAH
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Michelle Shoniwa wrote: using vb6.0
VB6 has been dead and unsupported by Microsoft since March of 2005, you might want to reconsider doing any real work in VB6.
"The clue train passed his station without stopping." - John Simmons / outlaw programmer
"Real programmers just throw a bunch of 1s and 0s at the computer to see what sticks" - Pete O'Hanlon
"Not only do you continue to babble nonsense, you can't even correctly remember the nonsense you babbled just minutes ago." - Rob Graham
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Good day everybody,
I have placed a Timer (System.Threading.Timer) in my app that fires every 1 sec. Every now and then, it just stops runinng. The app does not report any errors, and therefore I have no idea what so ever. Here is the code:
//Assing timer's callback sub
Private Sub FrmMain_Load(ByVal sender As Object, ByVal e As EventArgs) Handles MyBase.Load
'*Grade Engine
Dim GradeTmrDel As New Threading.TimerCallback(AddressOf GradeTmr_Routine)
GradeTmr = New Threading.Timer(GradeTmrDel, Nothing, 2000, 1000)
End Sub
//this is the callback sub
Private Sub GradeTmr_Routine(ByVal iState As Object)
Static InProcess As Boolean
Dim Msg(), SubMsg(1), NextGrade As String
If InProcess Then Return
InProcess = True
Try
NextGrade = Get_NextGrade()
......
End If
Catch ex As InvalidOperationException
Handle_Er(Err, "GradeTmr") : End
Catch
Handle_Er(Err, "GradeTmr")
Finally
InProcess = False : Grading = False
End Try
End Sub
//Error handler routine - writes to eventlog and posts a message on screen
Private Sub Handle_Er(ByRef Er As ErrObject, ByRef Source As String)
If StatBar.Panels(1).Text = "" Then
StatBar.Panels(0).Text = "Warning! at least one error has been logged!" : StatBar.Panels(1).Icon = New System.Drawing.Icon("W95MBX03.ICO") : StatBar.Panels(1).Text = "Clear"
StatBar.Panels(0).ToolTipText = "Use the Event Viewer to access error's data" : StatBar.Panels(1).ToolTipText = "Click to reset!"
End If
syscorelog.WriteEntry(Er.Description & Chr(10) & Source & Chr(10) & Er.GetException.StackTrace, EventLogEntryType.Error)
End Sub
Thanks for your guidance!
Alex.
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You might want to try stopping the timer at the beginning of the tick handler and starting it again at the end. Comment out the code that keeps track of InProcess.
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Hi Dave,
That is the first approach a tried, but timers within the system.threading namespace
do not have the STOP, START methods of timers within the system.timer namespace.
I then tried using the CHANGE method of this timer to replicate the same behavior, but the app did not like that at all. Apparently what it did was to generate new threads of the timer thus consuming all CPU resources.
I chose the system.threading namespace timer, because I understood this class automatically run the timer in the system provided thread.
The app has two other timers that fire each at different intervals and I have noticed that some times two or all three of them present the same issue.
Hope this helps you to help me 
Thanks for your time.
Alex.
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alexvw wrote: That is the first approach a tried, but timers within the system.threading namespace
do not have the STOP, START methods of timers within the system.timer namespace.
Whoops. You're right. So, then destroy the timer and create a new one.
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Hi Dave,
I will try that approach!
thanks.
Alex.
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i m making paint and brush in vb.net, the problem is when i draw any graphic (eg.- line rectanle, e.t.c), on my picture box, the graphic get unsaved on the image, as soon as i do another action i.e- click anwhere else on pic box, minimization of working window...
then drawing done get erased...
now i want u to help me in saving the previously done drawing on the pic box "image"
i m a bigginer, please help me!!!
With regards
Vineet Swami
Isol
Vineet Swami
Isol
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This problem tells me that your not managing drawing properly. All drawing has to be done in your OnPaint event. You can get away with drawing from outside the OnPaint event, but only temporarily. Once Windows tells the control to redraw itself, you'll lose all the painting you've done outside of OnPaint.
What you have to do is once you get done "drawing" with the mouse, all the changes you just made have to be drawn on a bitmap object so that you have the changes saved and they can be redrawn at any time by the code in the OnPaint event.
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here is not any OnPaint event, i have paint event and that not work properly this is coading of this event
Private Sub PicBox_Paint(ByVal sender As Object, ByVal e As System.Windows.Forms.PaintEventArgs) Handles PicBox.Paint
If brect = 1 Or bellipse = 1 Or bline = 1 Then
x2 = Cursor.Position.X
y2 = Cursor.Position.Y
x = Me.Location.X + 9
y = Me.Location.Y + 57
x2 = x2 - x
y2 = y2 - y
bm = PicBox.Image
Dim tpen As New Pen(frmmain.lblcolfront.BackColor)
If bline = 1 Then
objgraphics.DrawLine(tpen, x1, y1, x2, y2)
End If
If x1 < x2 Then
If y1 < y2 Then
If brect = 1 Then
objgraphics.DrawRectangle(tpen, x1, y1, x2 - x1, y2 - y1)
End If
If bellipse = 1 Then
objgraphics.DrawEllipse(tpen, x1, y1, x2 - x1, y2 - y1)
End If
Else
If brect = 1 Then
objgraphics.DrawRectangle(tpen, x1, y1 - (y1 - y2), x2 - x1, y1 - y2)
End If
If bellipse = 1 Then
objgraphics.DrawEllipse(tpen, x1, y1 - (y1 - y2), x2 - x1, y1 - y2)
End If
End If
Else
If y1 < y2 Then
If brect = 1 Then
objgraphics.DrawRectangle(tpen, x1 - (x1 - x2), y1, x1 - x2, y2 - y1)
End If
If bellipse = 1 Then
objgraphics.DrawEllipse(tpen, x1 - (x1 - x2), y1, x1 - x2, y2 - y1)
End If
Else
If brect = 1 Then
objgraphics.DrawRectangle(tpen, x1 - (x1 - x2), y1 - (y1 - y2), x1 - x2, y1 - y2)
End If
If bellipse = 1 Then
objgraphics.DrawEllipse(tpen, x1 - (x1 - x2), y1 - (y1 - y2), x1 - x2, y1 - y2)
End If
End If
End If
End If
bm.Save("C:\Documents and Settings\manojji\My Documents\My Pictures\temp" & ".bmp")
End Sub
Vineet Swami
Isol
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First, objGraphics isn't defined anywhere in the code you've posted. Next, what is bm and where is it defined??
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objGraphics is defined in a module publicly as
Public objgraphics As Graphics = Frmpage.PicBox.CreateGraphics()
bm is a bitmap object defined as
Dim bm As Bitmap
Private Sub Frmpage_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
bm = PicBox.Image
End Sub
thanks
Vineet Swami
Isol
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This is a bad idea. You should be creating a Graphics object whenever you need it, then use it, and Dispose of it. Don't create one and hang onto it for the life of your application.
Also, setting the bitmap object equal to the PictureBox.Image isn't really buying you anything. The bitmap object should be it's own bitmap, drawn on when the mouse is released, then the PicBox, when not drawing on mouse down, should be drawing the contents of this bitmap.
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hi friend
i using this code for verify copy Data its copy Properly or not .
but it's reads full file at a time so it make load on memory Usage and i think in large amount of data verification its create problem. so there any other process to do this
task Please Help me.
Thanks
Code:=
Private Function getFileMd5(ByVal filePath As String) As String
' get all the file contents
Try
Dim File() As Byte = System.IO.File.ReadAllBytes(filePath)
' create a new md5 object
Dim Md5 As New Security.Cryptography.MD5CryptoServiceProvider()
Dim byteHash() As Byte = Md5.ComputeHash(File)
Return Convert.ToBase64String(byteHash)
Catch ex As Exception
End Try
End Function
Piyush Vardhan Singh
p_vardhan14@rediffmail.com
http://holyschoolofvaranasi.blogspot.com
http://holytravelsofvaranasi.blogspot.com
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You'll have to change this code to get rid of the line that says ReadAllBytes(filePath) to open the file as a FileStream. Then you can pass the FileStream to the ComputeHash method to compute the hash.
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ok this is the situation
im developing a programs that needs a users to map their database table to another table
but i want it to be visual to minimize the errors that the users can create
can somebody give me an idea on how to do this ?
here is a screenshot of a similar interface i got from another software..
http://i111.photobucket.com/albums/n159/jeipiyaku/dtmap.jpg
can anyone give me an idea on how to this or atleast tell me of a control that i can use to do this
thanks a lot codeproject
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There is no easy way to do this, despite sending in a snapshot of what looks like a sql server database diagram (or maybe Access?)
The only way is to write it yourself, trying to ensure data type integrity.
Bob
Ashfield Consultants Ltd
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I want the old DTS field mapping tool, 2 listboxes and draw lines to map the fields.
I must say I'm surprised there is not a custom or third party tool for this.
Never underestimate the power of human stupidity
RAH
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yeah to think that i wasted my time looking for one..
and yeah thats what im using now 2 listbox..
and im thinking of creating a control for this
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As Bob said, maintaining data type integrity is going to be a challenge
Whenever we work with ETL we only use VARCHAR and then build a proc to do the transforms only AFTER the data has been loaded into a staging table. One of the reasons I have Biz Talk and SSIS is they try to do the transforms during the load process. I find this hugely complicates the load process.
BTW we do not attempt to supply a "flexible" or generic solution to the users, each type of load requires a specific stored proc to do the transforms. Some of the rules are so complex, based on esoteric data that they cannot be supported by an ETL tool.
We actually paid from a POC for a Biz Talk organsation, we got back a custom process in C#. Turned out a proc in SQL was orders of magnitude faster!
Never underestimate the power of human stupidity
RAH
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