Visual Basic

VB.NET: Error adding multiple rows in a DataGridView (not bound to a DataTable)

22-Sep-09 5:13

Seeing as VB6 is a dead language, support for it is getting more and more sparse. Try looking through this[^] list for some options.

Good luck with that!

A guide to posting questions on CodeProject[^]

Dave Kreskowiak
Microsoft MVP
Visual Developer - Visual Basic
2006, 2007, 2008
But no longer in 2009...

Dimitri Backaert22-Sep-09 2:33

Dimitri Backaert

22-Sep-09 2:33

Hi,

I'm having problems adding multiple rows to a DataGridView, on the Load-event of a Windows Application Form.

Adding one record doesn't cause a problem, but when adding the second record (using the identical code), an Exception is thrown.

Here's my code so far (VB.NET 2008):

Private Sub BWMFPForm_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
    Dim dgvRow As New DataGridViewRow
    Dim dgvCell As DataGridViewCell
    Dim dgvButton As DataGridViewImageColumn
    Dim column As DataGridViewColumn

    'Disable sorting for all Columns
    For Each column In DataGridViewBrochures.Columns
        column.SortMode = DataGridViewColumnSortMode.NotSortable
    Next

    'Add Record
    'Column 1: Machine
    dgvCell = New DataGridViewTextBoxCell()
    dgvCell.Value = "Aficio MP 4000 / Aficio MP 5000"
    dgvRow.Cells.Add(dgvCell)
    'Column 2: Speed
    dgvCell = New DataGridViewTextBoxCell()
    dgvCell.Value = "40 PPM / 50 PPM"
    dgvRow.Cells.Add(dgvCell)
    'Column 3: Language
    dgvCell = New DataGridViewTextBoxCell()
    dgvCell.Value = "Nederlands"
    dgvRow.Cells.Add(dgvCell)
    'Column 4: Image Print
    dgvButton = New DataGridViewImageColumn
    dgvButton.Image = Drawing.Image.FromFile("D:\DEVPROJECTS\MarketingTouchScreen\TouchScreen\images\Print_Icon.jpg")
    dgvButton.ReadOnly = True
    dgvButton.ImageLayout = DataGridViewImageCellLayout.Normal
    DataGridViewBrochures.Columns.Add(dgvButton)
    'Add the Row
    DataGridViewBrochures.Rows.Add(dgvRow)

    'Add Record
    'Column 1: Machine
    dgvCell = New DataGridViewTextBoxCell()
    dgvCell.Value = "Aficio MP 4000 / Aficio MP 5000"
    dgvRow.Cells.Add(dgvCell)
    'Column 2: Speed
    dgvCell = New DataGridViewTextBoxCell()
    dgvCell.Value = "40 PPM / 50 PPM"
    dgvRow.Cells.Add(dgvCell)
    'Column 3: Language
    dgvCell = New DataGridViewTextBoxCell()
    dgvCell.Value = "Nederlands"
    dgvRow.Cells.Add(dgvCell)
    'Column 4: Image Print
    dgvButton = New DataGridViewImageColumn
    dgvButton.Image = Drawing.Image.FromFile("D:\DEVPROJECTS\MarketingTouchScreen\TouchScreen\images\Print_Icon.jpg")
    dgvButton.ReadOnly = True
    dgvButton.ImageLayout = DataGridViewImageCellLayout.Normal
    DataGridViewBrochures.Columns.Add(dgvButton)
    'Add the Row
    DataGridViewBrochures.Rows.Add(dgvRow)

End Sub

Anyone can help me here?

Kindly Yours

Re: VB.NET: Error adding multiple rows in a DataGridView (not bound to a DataTable)

Jay Royall22-Sep-09 2:52

Jay Royall

22-Sep-09 2:52

When adding your second record you are still using the same DataGridViewRow as for the first record. You will need to use the new keyword on dgvRow before adding cells to it.

Also, in future it is helpful if you include any error messages in your post Smile | :)

Re: VB.NET: Error adding multiple rows in a DataGridView (not bound to a DataTable)

Dimitri Backaert22-Sep-09 2:59

Dimitri Backaert

22-Sep-09 2:59

Hi Liqz,

Thanks!
That did the trick.

I'll keep in mind that next time, I'll include the error message.

Cheers.

Re: VB.NET: Error adding multiple rows in a DataGridView (not bound to a DataTable)

Jay Royall22-Sep-09 3:01

Jay Royall

22-Sep-09 3:01

You're welcome Smile | :)

Re: VB.NET: Error adding multiple rows in a DataGridView (not bound to a DataTable)

Kschuler22-Sep-09 2:55

Kschuler

22-Sep-09 2:55

For future reference, adding the text of the exception is always helpful. However from you're code I'm guessing it's something like "...row already exists in grid." ...or something like that. You're adding the same row object to the grid twice. You need a new row object the second time around. Otherwise all you are doing is updating the data in the first row you added.

Hope this helps.

How to run C program using .Net?

paya1pa22-Sep-09 1:42

paya1pa

22-Sep-09 1:42

Hi Experts,
I am trying to create an application that can Execute an C Program in VB.Net.

Can anybody please help me.

Regards,
Sheetal

Henry Minute22-Sep-09 1:53

Henry Minute

22-Sep-09 1:53

paya1pa wrote:
I am trying to create an application that can Execute an C Program in VB.Net.

If that means that you are trying to execute a compiled C Program, then look at the documentation for the Process class.

If not, then you need to explain your question more clearly.

Henry Minute

Do not read medical books! You could die of a misprint. - Mark Twain
Girl: (staring) "Why do you need an icy cucumber?"
“I want to report a fraud. The government is lying to us all.”

paya1pa22-Sep-09 2:06

paya1pa

22-Sep-09 2:06

hi expert i revieced your message
firstly thanks to your reply and i can try explain my question.

i want to make one project and project is c prgramme ran in vb.net 2005
ex. suppose i write one addtion programme of two number so vb,net complile this programe and show error in textbox or messagebox.just like a c language software. but everythisk is run in vb.net 2005

please give me a reply

Henry Minute22-Sep-09 2:22

Henry Minute

22-Sep-09 2:22

paya1pa wrote:
i want to make one project and project is c prgramme ran in vb.net 2005

Rather obviously, VB.Net cannot compile 'C' code.

paya1pa wrote:
ex. suppose i write one addtion programme of two number so vb,net complile this programe and show error in textbox or messagebox.just like a c language software. but everythisk is run in vb.net 2005

If you want to write a simple program to add two numbers, then I would suggest that you either buy a beginners book and work through the examples, or search with Google or Bing for vb.net beginners ebook and you might find a suitable free tutorial.

Other than that I am unable to help.

Good Luck. Smile | :)

Dave Kreskowiak22-Sep-09 3:50

22-Sep-09 3:50

So do you want to write your own C compiler or use a third party command line compiler, or what?

A guide to posting questions on CodeProject[^]

Dave Kreskowiak
Microsoft MVP
Visual Developer - Visual Basic
2006, 2007, 2008
But no longer in 2009...

paya1pa22-Sep-09 5:37

paya1pa

22-Sep-09 5:37

thanks experts i think can't explain my querry

i want complie c proramme in vb.net 2005 whatever.
output display in textbox

Dave Kreskowiak22-Sep-09 6:21

Voice Recognition in vb.net

22-Sep-09 6:21

If you can't communicate your apps specifications, you're not going to get any meaningful answers.

What you have posted has a lot of different answers, and each of those opens up more and more questions.

Sorry, but it is VERY true that the quality of the answer you get is directly dictated by the quality of the question.

A guide to posting questions on CodeProject[^]

Dave Kreskowiak
Microsoft MVP
Visual Developer - Visual Basic
2006, 2007, 2008
But no longer in 2009...

krinaljariwala21-Sep-09 20:09

krinaljariwala

21-Sep-09 20:09

Hello to everyone,
I want to implement voice recognition feature in my application. I need to recognize couple of words and then open the recognized application(i.e. word, excel, etc.). I really new to it, so help me out.
Thank you in advance.

Re: Voice Recognition in vb.net

0x3c021-Sep-09 20:54

0x3c0

21-Sep-09 20:54

You might want to look into the System.Speech.Recognition namespace, particularly the class SpeechRecognitionEngine. Don't forget to call LoadGrammar with a new instance of System.Speech.Recognition.DictationGrammar.DictationGrammar

OSDev

Function with different types of arguments

TeachesOfPeaches21-Sep-09 12:36

TeachesOfPeaches

21-Sep-09 12:36

Hi,

I have a function that populates a list with items of type 'RemoteCustomFieldValue'. Now I would like to extend this function in a way that the list would accept items of different type 'RemoteFieldValue'.
I thought this would work like in the snippet but I get the following error in the if-statement:

'The expression of type "System.Collections.Generic.List(Of T)" can never be of type "System.Collections.Generic.List(Of legion.SST.Jira.RemoteCustomFieldValue)".'

And another one when adding the item to the list
'The value of type "legion.SST.Jira.RemoteFieldValue" can not be converted to "T"'

How can I solve this problem? Perhaps is there another way to do it.

Many thanks in advance

Private Sub GetUserInputValues(Of T)(ByRef alRemoteCustomFieldValue As List(Of T))

        ....
           If TypeOf alRemoteCustomFieldValue Is List(Of RemoteCustomFieldValue) Then                             
                        Dim rcfvUsrInput As RemoteCustomFieldValue = New RemoteCustomFieldValue
                        rcfvUsrInput.customfieldId = ContentCtrl.ID
                        rcfvUsrInput.values = s.ToArray
                        alRemoteCustomFieldValue.Add(rcfvUsrInput)
              Else
                        Dim rcfvUsrInput As RemoteFieldValue = New RemoteFieldValue
                        rcfvUsrInput.id = ContentCtrl.ID
                        rcfvUsrInput.values = s.ToArray
                        alRemoteCustomFieldValue.Add(rcfvUsrInput)
                        End If
              End If

End Sub

Re: Function with different types of arguments

Gideon Engelberth21-Sep-09 15:44

Gideon Engelberth

21-Sep-09 15:44

Even if you could have the TypeOf ... is ... condition you were trying for, the code inside that if block will still fail. Just because you have made a check to ensure that the contents of a variable is a certain type, the compiler will still treat the variable as if it is the base type. You would need to put something like this:

Private Sub GetUserInputValues(Of T)(ByRef alRemoteCustomFieldValue As List(Of T))
    ....
    If TypeOf alRemoteCustomFieldValue Is List(Of RemoteCustomFieldValue) Then                             
        'make a variable of the type just checked for and cast the original to it
        Dim customList As List(Of RemoteCustomFieldValue) = _
                CType(alRemoteCustomFieldValue, List(Of RemoteCustomFieldValue)
        Dim rcfvUsrInput As RemoteCustomFieldValue = New RemoteCustomFieldValue
        rcfvUsrInput.customfieldId = ContentCtrl.ID
        rcfvUsrInput.values = s.ToArray
        'use the cast variable
        customList.Add(rcfvUsrInput)
    Else
    ....

The problem stems mainly from the fact that generic classes cannot be converted based on the type parameter (eg: List(of Derived) cannot be converted to List(of Base)). You can however create a specialized version of the function for when T is RemoteCustomFieldValue.

Private Sub GetUserInputValues(alRemoteCustomFieldValue As List(of RemoteCustomFieldValue))
    'special code for this type
End Sub

However, if you have a class SpecializedFieldValue that derives from RemoteCustomFieldValue, and you have a List(of SpecializedFieldValue), the more generic version of the function would be called.

Also, unless you intend to completely replace the list in the code that calls the function (not just Clear and Add new items), you should probably pass ByVal instead of ByRef.

Backup Utility Program

LaBe121-Sep-09 10:52

LaBe1

21-Sep-09 10:52

This program can make back ups of set directories at an interval or on demand. Instructions are given as you click buttons.

<size=18>New Version: 3.1
Changes in 3.1:
- No error occurs when minutes box has a 0 in it.
- Stop auto-backup button with confirmation on press if you're sure.
- Close button checks if you're auto-backing up, and gives message accordingly.
- Timed out messagebox's timer now restarts every time it pops up and doesn't carry over.

Pic: View Pic

Virus Scan: Virus Scan Results

Download link: Download

Original thread: Clicky

Henry Minute21-Sep-09 11:47

Henry Minute

21-Sep-09 11:47

Don't spam the forums. If you want CP members to see your work, then write a proper article and submit it in the normal way.

Dave Kreskowiak21-Sep-09 14:50

21-Sep-09 14:50

Virus scan results?? Yeah, right. Like I'm going to trust that from a total stranger.

A guide to posting questions on CodeProject[^]

Dave Kreskowiak
Microsoft MVP
Visual Developer - Visual Basic
2006, 2007, 2008
But no longer in 2009...

LaBe123-Sep-09 15:01

LaBe1

23-Sep-09 15:01

Sorry, I'm new to this forum and just looking for some people who might be interested in using my programs. If someone could help me out with, 'The normal way of posting things' that'd be great!

Dave Kreskowiak24-Sep-09 2:10