instantiating object returns nothing - Visual Basic Discussion Boards

Hello every one,
I am using DataGridView in 2-3 forms in my application
In one of my forms I have 3 girds and if I alter any thing in the design mode then the default cell header and default cell style changes. But the alternate row style remains what I had saved as.

Dose any one has a idea of how to get rid of this problem

Regards
Nshkarsh

What do you mean by "problem"? From what you've described, this is normal behavior, depending on what you changed and how your code is written. You haven't said anything about what you expect it to do, or what you changed in the Properties of the DataGridView.

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Dave Kreskowiak
Microsoft MVP
Visual Developer - Visual Basic
2006, 2007

Hi Dave
I think I had not described the issue properly…

I will try to define it again it again

In one of my forms I am suffering with the following issue
- Once I change the font and sizes of the rows in a datagridview save it then it works fine
- Once I change even the location of any other object, say a label, on that form all the properties changes (fonts and size) done in datagridview are set back to the default

Id there a way out?

I have an application called "MEDGIDS". In that the main EXE file accessing the folder called "images".
I want to lock the "images" folder for the external view(It shouldn't show the files inside the folder).
Assume the "images" folder is locked then how can i access the folder from my main EXE file.
I need to lock the "images" folder, and if i locked then how to access the "images" folder from main EXE.

Thanks & Regards
Kumaran

I would user a DirectoryInfo to change the hidden attribute.

I am not aware that you can "lock" a folder, there is only hidden and read only and of course access permiisions controlled by active directories.

Attribute changes allow your exe to get at the files and can be done in VB. AD changes are much more stringent.

Never underestimate the power of human stupidity
RAH

If you really want to secure your image files, you perhaps should consider storing them in a database like an SQL Server database.

Steve Jowett
-------------------------
It is offen dangerous to try and see someone else's point of view, without proper training. Douglas Adams (Mostly Harmless)

You cannot "lock" a folder beyond the security provided by NTFS. You also cannot change the security so just an application can get to the folder. This is because when you launch an application, it inherits the security token of the user that launched it. In other words, the application is impersonating the user and has the same security permissions that the user does. So, if you change the security so a person cannot see what's inside the folder, your application won't be able to see it either.

A guide to posting questions on CodeProject[^]

Dave Kreskowiak
Microsoft MVP
Visual Developer - Visual Basic
2006, 2007

Hi,

I have this code. Which is the beginning of class. The last line
objSI = new TBRSendDocInfo
has an error when this code
executes objSI is nothing.

What would cause a object not be able to instantiate it???

The object TBRSendDocInfo definition is below this code.

<transaction(transactionoption.requiresnew)> Public Class TransTimesheetWeekly
Inherits ServicedComponent

Public objSI As TBRSendDocInfo

Private CapType As String

Private CapID As Integer

Private justTimesheet As Boolean

Private SickDefault As Date = "01/01/1980"

Private HolidayDefault As Date = "01/01/1981"

Private LWOPDefault As Date = "01/01/1982"

Private Const WorkedDefault As String = "01/01/1984"

Private Const NotWorkedDefault As String = "01/01/1985"

Public Function ProcessTimesheetWeekly(ByVal tswID As Integer) As Integer

objSD = clsServiceDefaults.Load("C:\Windows\TBRServices.xml", GetType(clsServiceDefaults))

Connstr = objSD.TBRConnCap

WebConnstr = objSD.TBRWebConnCap

gTestEmail = objSD.TestEmailCap

Dim objCI As New tblCapturedInvoices(mdsDatabaseV3.mdsDbType.dbSQL)

Dim objTW As New tblwebTimesheetWeekly(mdsDatabaseV3.mdsDbType.dbSQL)

Dim objDB As New mdsDatabaseV3.cMDSTableData(Connstr, mdsDatabaseV3.mdsDbType.dbSQL)

Dim objWDB As New mdsDatabaseV3.cMDSTableData(WebConnstr, mdsDatabaseV3.mdsDbType.dbSQL)

Dim objDR As SqlClient.SqlDataReader

Dim objPR As SqlClient.SqlDataReader

Dim SQL, s As String

Dim i, j, wk, newID, wksInv As Integer

Dim objR As DataRow

Dim submitted As Date

Try

objSI = New TBRSendDocInfo

etc

etc

Imports System.Xml.Serialization

Imports System.IO

Public Class PDFDocInfo

Public InputFile As String

Public DocType As String

Public OutputFile As String

End Class

Public Class TBRSendDocInfo

Public ID As Integer

Public FirstName As String

Public LastName As String

Public Email As String

Public RecipientName As String

Public Subject As String

Public Body As String

Public LesterUser As String

Public FromEmail As String

<xmlignore()> Public PDFDocs As New ArrayList

Public Sub AddPDFDocInfo(ByVal pdfinfo As PDFDocInfo)

PDFDocs.Add(pdfinfo)

End Sub

Public Function AddNewPDFDocInfo() As PDFDocInfo

Dim newPDFDocInfo As New PDFDocInfo

PDFDocs.Add(newPDFDocInfo)

Return newPDFDocInfo

End Function

Public Property SendPDFDocs() As PDFDocInfo()

Get

Dim numPDFDocs As Integer

If PDFDocs.Count = 0 Then

numPDFDocs = 0

Else

numPDFDocs = PDFDocs.Count - 1

End If

Dim PDFDocInfoArray(numPDFDocs) As PDFDocInfo

PDFDocs.CopyTo(PDFDocInfoArray)

Return PDFDocInfoArray

End Get

Set(ByVal Value As PDFDocInfo())

PDFDocs.Clear()

If Not Value Is Nothing Then

Dim PDFDocInfo As PDFDocInfo

For Each PDFDocInfo In Value

PDFDocs.Add(PDFDocInfo)

Next

End If

End Set

End Property

Public Function Save(ByVal filename As String)

Dim tempFilename As String

tempFilename = filename & ".tmp"

Dim tempFileInfo As New FileInfo(tempFilename)

If tempFileInfo.Exists = True Then tempFileInfo.Delete()

Dim stream As New FileStream(tempFilename, FileMode.Create)

Try

Save(stream)

stream.Close()

tempFileInfo.CopyTo(filename, True)

tempFileInfo.Delete()

Catch ex As Exception

MsgBox("Error on Save of file " & filename & ". " & vbCrLf & ex.Message)

End Try

End Function

Public Function Save(ByVal stream As Stream)

Dim serializer As New XmlSerializer(Me.GetType)

serializer.Serialize(stream, Me)

End Function

Public Shared Function Load(ByVal filename As String, ByVal newType As Type) As Object

Dim fileInfo As New FileInfo(filename)

If fileInfo.Exists = False Then

Return System.Activator.CreateInstance(newType)

End If

Dim stream As New FileStream(filename, FileMode.Open)

Dim newObject As Object = Load(stream, newType)

stream.Close()

Return newObject

End Function

Public Shared Function Load(ByVal stream As Stream, ByVal newType As Type) As Object

Dim serializer As New XmlSerializer(newType)

Dim newObject As Object = serializer.Deserialize(stream)

Return newObject

End Function

End Class

You should post only relavent code. No one is going to take the time to read all that. Post only relavent lines, and also include the full, detailed error message you are getting. Without both of those things being done, your chances of getting helped are slim.

I'm going to become rich when I create a device that allows me to punch people in the face over the internet.

"If an Indian asked a programming question in the forest, would it still be urgent?" - John Simmons / outlaw programmer

In vb 6.0 we can use adodc by using connectionstring and recordsource properties and we can use that datasource and datafield properties to bind the controls with adodc.

But in vb.net there is no property to bind controls with adodc control.In vb.net we can only use databinding.add method to bind the controls but it does not allow to bind control with the adodc control.

Any idea how I can use adodc in vb.net 2005?

Thanks in advance

Ejaz

I suggest you look into OLEDB as a datalayer option, I beleive the datacontrol idea has been deprecated in .net

Never underestimate the power of human stupidity
RAH

Thanks Holmes for the reply.

I never use oledb as data layer.Any artical or sample for this?

Ejaz

2 pages of article on this site alone.[^]

Never underestimate the power of human stupidity
RAH

Adodc is not used anymore.

"I guess it's what separates the professionals from the drag and drop, girly wirly, namby pamby, wishy washy, can't code for crap types." - Pete O'Hanlon

haw im using control.invoke and why?

What is your question? It makes absolutely no sense.

"I guess it's what separates the professionals from the drag and drop, girly wirly, namby pamby, wishy washy, can't code for crap types." - Pete O'Hanlon

plz can someone try to help me how i can use DataGrid with dataset????
voila mon msn Poke tongue | ;-P

cheikh_arabe@hotmail.com

Well it sort of depend on what you want to do, what platform you are using and a little more information tha you supplied.

I suggest searching as your first step, then try reading, then try and if you are still stuck ask an intelligent ?

use the search at the top of the page[^]

Never underestimate the power of human stupidity
RAH

Have you ever heard of google? Do a search there and you'll find a wealth of information Big Grin | :-D

"I guess it's what separates the professionals from the drag and drop, girly wirly, namby pamby, wishy washy, can't code for crap types." - Pete O'Hanlon

I am working with VB6 looking at an Access 97 database. What I am doing is converting VB5 code to VB6. I have come across a problem where the code creates a Query in the Access file, then assigns that query to a Recordset (I know the query is fine because when I run open it in Access it shows the desired results). The problem is with some DSum, DMin, and DMax statements in the Query. It assigns the Query to the Recordset with no problem (.Data1.RecordSource = "SELECT qryJCDSSchedLU1.* FROM qryJCDSSchedLU1 ") but then it runs a refresh (.Data1.Refresh) and then this gives an error. (Error – 3085 DOA. Database – Undefined function ‘DSUM’ in expression.) If I remove the DSum then it gives me this error on the DMin, and if I remove that it gives me the error on the DMax.

This works just fine in VB5 but not in VB6. Can anyone give me any suggestions on what I need to do to fix this? Thanks in advance for any help that you can give.

modified on Thursday, January 31, 2008 3:21:19 PM

And here I thought we were using cutting edge technology. The temptation to be rude is sooo strong but I'll refrain.

You are upgradeing from 5 to a product that is already retired and no longer supported. Why not move straight to .net you would get a lot more support and resources would be current.

Take the opportunity to rewrite the app, upgrade your skills, produce a BETTER solution.

Never underestimate the power of human stupidity
RAH

I am sorry I thought this form said Visual Basic / VB.Net which I thought meant that you could post any questions in here regarding Visual Basic. Can someone help me with the question that I posted? This is probably a very easy answer that others have come across in the past and know exactly how to handle it.

I don't understand what drives some people to waste their time by going in and out of forums making stupid comments and judging others instead of helping that person with the situation at hand (do you really have to try and make others feel bad to make yourself feel better?). I don't think I have to justify the reason that I am converting to VB6 or what I plan to do with this code once it is in VB6.

Mycroft Holmes wrote:
The temptation to be rude is sooo strong but I'll refrain.

...right back at ya buddy!

I don't have a problem with using the old stuff, but he is right in one sense. VB6 has been "officially" dead for over a year now. DAO (not DOA) has been dead for about 8 years now, I think. That being said, your support resources out on the web are dwindling fast.

This[^] is about the best you're going to get.

A guide to posting questions on CodeProject[^]

Dave Kreskowiak
Microsoft MVP
Visual Developer - Visual Basic
2006, 2007

Yes I agree that VB6 is "officially' dead. And I have no less than 3 other programs that are written in VB.net 2005. But for this project I have to convert it to VB6 before I can more forward to .Net and I have it at least 90 percent converted but there are several places in this code that uses the scenario that I presented in my question. That is why I am asking for help.

I would think you will have to rewrite the query in Access to duplicate the results, I would guess that DSum is an Access specific function that is no longer supported by the later version of DOA.

And yes the forum is for VB and you are correct to ask the ? here, however it stikes me as invalid to move from 5 to 6 before moving to .net, a waste of resources. I just hope it is not so you can use the upgrade wizard to get the app into .net!

Never underestimate the power of human stupidity
RAH