updating records

I am trying to update a record using one of samples provided and I always have the following error:

"Reference to a non-shared member requires an object reference"

The code I use is as follows:

Dim totalsRow As mdstats1DataSet.TotalsRow

totalsRow = mdstats1DataSet.Totals.FindByRecordID(1)

totalsRow.smtpin = smtpin

totalsRow.smtpout = smtpout

The error is on the "mdstats1DataSet.Totals"

Can anyone help me

BTW, I am using VB Express and SQL Express

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updating records

David Leibowitz

Blaine,

I think that you probably still do not have an instance of the mdstatsDataSet. Why don't you post the code for the whole form ... it might be easier for us to help you that way.
squeakstar
I don't see any code to actually *get* the data from your database. You need to use a DataAdapter and .Fill() the DataSet.
Cornishboy
Well, I am a complete beginner to this so a could be missing something critcal. All I have been doing is using the MSDN help files that came with VB Express.

Here is an explanation of what I am trying to do;

I have a database in SQL express with a table called "totals", it has only one row of data and will only have one row of data, all I want to do write the new valuses to that table.

The example from the help files says this;

Dim customerRow() As Data.DataRow

customerRow = DataSet1.Tables("Customers").Select("CustomerID = 'ALFKI'") customerRow(0)("CompanyName") = "Updated Company Name"
customerRow(0)("City") = "Seattle"

I have modified the the example to this:

Dim totalsRow() As Data.DataRow
totalsRow = mdstatsDataSet.Tables("totals").Select("RecordID = 1")
totalsRow(0)("smtpin") = Ismtpin
totalsRow(0)("smtpout") = Ismtpout

however I get the following error on "mdstatsDataset.Tables":

Error 1 Reference to a non-shared member requires an object reference. F:\Documents\Visual Studio 2005\Projects\MD Stats counter\WindowsApplication3\Form1.vb 146 21 MD Stats counter
DerekM

The only thing I can get out of that error message is that you're trying to access a row in your DataTable when you have no rows.

You're gonna have to post some code ... including pointing out the line that caused the error. Doing a little debugging on your own might not be a bad idea either.
ChrisCC
Read Ray's first reply to you. He wrote in red text how to do that because he said then that it looked like you were missing that (which I agree with).
RebEl
Assuming that I'm reading your issue correctly, you need an instance of mdstats1DataSet. (In order to actually get a row back, you will have to add some data to your DataSet.) Try to change your code to the following (changes in red):
Michael Iacoviello

Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load

Dim textline As String

Dim count As String

Dim field, l As String

Dim stringlength, EqualSignPos, linecount As Single

Me.Text = My.Application.Info.Title

linecount = 0

FileOpen(1, "C:\mdaemon\app\guicounts.dat", OpenMode.Input)

While Not EOF(1)

l = LineInput(1)

linecount = linecount + 1

End While

FileClose(1)

ProgressBar1.Maximum = linecount

FileOpen(1, "C:\mdaemon\app\guicounts.dat", OpenMode.Input)

linecount = 0

While Not EOF(1)

textline = LineInput(1)

linecount = linecount + 1

If textline <> "[GUI_Counts]" Then

stringlength = Len(textline)

EqualSignPos = InStr(1, textline, "=")

field = Microsoft.VisualBasic.Left(textline, EqualSignPos - 1)

count = Microsoft.VisualBasic.Right(textline, stringlength - EqualSignPos)

ProgressBar1.Value = linecount

Select Case field

Case "Raw Today"

TextBox4.Text = count

Case "SmtpIn Today"

TextBox1.Text = count

Case "Spam Today"

TextBox3.Text = count

Case "Virus Today"

TextBox5.Text = count

Case "Pop Today"

TextBox7.Text = count

Case "SmtpOut Today"

TextBox2.Text = count

Case "MultiPop Today"

TextBox8.Text = count

Case "SpamRefused Today"

TextBox6.Text = count

Case "VirusRefused Today"

TextBox37.Text = count

Case "Imap Today"

TextBox9.Text = count

'Yesterday

Case "SmtpIn Yesterday"

TextBox18.Text = count

Case "Spam Yesterday"

TextBox16.Text = count

Case "Virus Yesterday"

TextBox14.Text = count

Case "Pop Yesterday"

TextBox12.Text = count

Case "SmtpOut Yesterday"

TextBox17.Text = count

Case "MultiPop Yesterday"

TextBox11.Text = count

Case "SpamRefused Yesterday"

TextBox13.Text = count

Case "VirusRefused Yesterday"

TextBox38.Text = count

Case "Imap Yesterday"

TextBox10.Text = count

Case "Raw Yesterday"

TextBox15.Text = count

'2 days back

Case "SmtpIn Back_2"

TextBox27.Text = count

Case "Spam Back_2"

TextBox25.Text = count

Case "Virus Back_2"

TextBox23.Text = count

Case "Pop Back_2"

TextBox21.Text = count

Case "SmtpOut Back_2"

TextBox26.Text = count

Case "MultiPop Back_2"

TextBox20.Text = count

Case "SpamRefused Back_2"

TextBox22.Text = count

Case "VirusRefused Back_2"

TextBox39.Text = count

Case "Imap Back_2"

TextBox19.Text = count

Case "Raw Back_2"

TextBox24.Text = count

'Totals

Case "SmtpIn Total"

TextBox36.Text = count

Case "Spam Total"

TextBox34.Text = count

Case "Virus Total"

TextBox32.Text = count

Case "Pop Total"

TextBox30.Text = count

Case "SmtpOut Total"

TextBox35.Text = count

Case "MultiPop Total"

TextBox29.Text = count

Case "SpamRefused Total"

TextBox31.Text = count

Case "VirusRefused Total"

TextBox40.Text = count

Case "Imap Total"

TextBox28.Text = count

Case "Raw Total"

TextBox33.Text = count

End Select

End If

End While

FileClose(1)

ProgressBar1.Visible = False

'convert strings to integers

Dim Ismtpin, Ismtpout, Ipop, Iraw, Iviruses, Ivirusesrefused, Ispam, Ispamrefused, Iimap, Imultipop As Integer

Ismtpin = CInt(TextBox36.Text)

Ismtpout = CInt(TextBox35.Text)

Ipop = CInt(TextBox30.Text)

Iraw = CInt(TextBox33.Text)

Iviruses = CInt(TextBox32.Text)

Ivirusesrefused = CInt(TextBox40.Text)

Ispam = CInt(TextBox34.Text)

Ispamrefused = CInt(TextBox31.Text)

Imultipop = CInt(TextBox29.Text)

Iimap = CInt(TextBox28.Text)

Dim ds As mdstatsDataSet = New mdstatsDataSet

ds.totals(0).RecordID = 1

ds.totals(0).smtpin = Ismtpin

ds.totals(0).smtpout = Ismtpout

ds.totals(0).pop = Ipop

ds.totals(0).raw = Iraw

ds.totals(0).viruses = Iviruses

ds.totals(0).virusesrefused = Ivirusesrefused

ds.totals(0).spam = Ispam

ds.totals(0).spamrefused = Ispamrefused

ds.totals(0).imap = Iimap

ds.totals(0).multipop = Imultipop
rjhdakota
OK, so that kind of worked, now I am getting the following error when it executes

System.IndexOutOfRangeException was unhandled
Message="There is no row at position 0."
Source="System.Data"
StackTrace:
at System.Data.RBTree`1.GetNodeByIndex(Int32 userIndex)
at System.Data.DataRowCollection.get_Item(Int32 index)
at MDStats.mdstatsDataSet.totalsDataTable.get_Item(Int32 index) in F:\Documents\Visual Studio 2005\Projects\MD Stats counter\WindowsApplication3\mdstatsDataSet.Designer.vb:line 362
at MDStats.Form1.Form1_Load(Object sender, EventArgs e) in F:\Documents\Visual Studio 2005\Projects\MD Stats counter\WindowsApplication3\Form1.vb:line 151
at System.Windows.Forms.Form.OnLoad(EventArgs e)
at System.Windows.Forms.Form.OnCreateControl()
at System.Windows.Forms.Control.CreateControl(Boolean fIgnoreVisible)
at System.Windows.Forms.Control.CreateControl()
at System.Windows.Forms.Control.WmShowWindow(Message& m)
at System.Windows.Forms.Control.WndProc(Message& m)
at System.Windows.Forms.ScrollableControl.WndProc(Message& m)
at System.Windows.Forms.ContainerControl.WndProc(Message& m)
at System.Windows.Forms.Form.WmShowWindow(Message& m)
at System.Windows.Forms.Form.WndProc(Message& m)
at System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m)
at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)
at System.Windows.Forms.NativeWindow.DebuggableCallback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)
at System.Windows.Forms.SafeNativeMethods.ShowWindow(HandleRef hWnd, Int32 nCmdShow)
at System.Windows.Forms.Control.SetVisibleCore(Boolean value)
at System.Windows.Forms.Form.SetVisibleCore(Boolean value)
at System.Windows.Forms.Control.Show()
at MDStats.SplashScreen1.Timer1_Tick(Object sender, EventArgs e) in F:\Documents\Visual Studio 2005\Projects\MD Stats counter\WindowsApplication3\SplashScreen1.vb:line 51
at System.Windows.Forms.Timer.OnTick(EventArgs e)
at System.Windows.Forms.Timer.TimerNativeWindow.WndProc(Message& m)
at System.Windows.Forms.NativeWindow.DebuggableCallback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)
at System.Windows.Forms.UnsafeNativeMethods.DispatchMessageW(MSG& msg)
at System.Windows.Forms.Application.ComponentManager.System.Windows.Forms.UnsafeNativeMethods.IMsoComponentManager.FPushMessageLoop(Int32 dwComponentID, Int32 reason, Int32 pvLoopData)
at System.Windows.Forms.Application.ThreadContext.RunMessageLoopInner(Int32 reason, ApplicationContext context)
at System.Windows.Forms.Application.ThreadContext.RunMessageLoop(Int32 reason, ApplicationContext context)
at System.Windows.Forms.Application.Run(ApplicationContext context)
at Microsoft.VisualBasic.ApplicationServices.WindowsFormsApplicationBase.OnRun()
at Microsoft.VisualBasic.ApplicationServices.WindowsFormsApplicationBase.DoApplicationModel()
at Microsoft.VisualBasic.ApplicationServices.WindowsFormsApplicationBase.Run(String[] commandLine)
at MDStats.My.MyApplication.Main(String[] Args) in 17d14f5c-a337-4978-8281-53493378c1071.vb:line 81
at System.AppDomain.nExecuteAssembly(Assembly assembly, String[] args)
at System.Runtime.Hosting.ManifestRunner.Run(Boolean checkAptModel)
at System.Runtime.Hosting.ManifestRunner.ExecuteAsAssembly()
at System.Runtime.Hosting.ApplicationActivator.CreateInstance(ActivationContext activationContext, String[] activationCustomData)
at System.Runtime.Hosting.ApplicationActivator.CreateInstance(ActivationContext activationContext)
at Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssemblyDebugInZone()
at System.Threading.ThreadHelper.ThreadStart_Context(Object state)
at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
at System.Threading.ThreadHelper.ThreadStart()
Jeff Barton
Like I said, you won't have any data in the DataSet with just the code that I provided. When you ask the DataSet to FindRecordById(), it's returning NULL because there are no rows.

This code will get a new row, set the values of that row, and then add the row to the DataSet. At that point, you can get a row by its record id:
forkart
Thats the funny part, there is a row of data in the table
difg
It's a lot of code, and I don't want to post that much. How do I look to see if I have an "instance" and how do I add one if I don't have it
Phattim
There is a Row of data in the database, All I want it to do is update the first row every time I run the program with the values.
TheCatty
Post the code please
David Wong Chien Shiung
This didn't work.

When the code executes I get this error

Object reference not set to an instance of an object.

on the line "totalsrow.smtpin = smtpin
updating records

Answer this question