Error When Opening Another Form?

May 19, 2012

I am creating a simple email application which sends mail from a user's Gmail account, as I haven't worked out how to receive incoming mail yet.I have created a form (frmSignIn) which asks for the log-in info and another (frmComposeMessage) which has all text boxes necessary for composing an email (to, subject, message body).After clicking Sign In on the first form, it should hide it and open the second form, however I get this error:

System.InvalidOperationException was unhandled
Message=An error occurred creating the form. See Exception.InnerException for details. The error is: Object reference not set to an instance of an object.

[code].....

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Error While Opening Form In Designmode, Pressing F5 Opens Form

Jan 15, 2009

Whenever I want to reopen a project that I didn't worked on for several month and want to view my form in design mode I receive following error.

Warning1Method not found: 'Void System.Windows.Forms.Design.ParentControlDesigner.WndProc(System.Windows.Forms.Message ByRef)'.00

[Code]....

I used this project in VB2005 express, but also in VB2008.

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Apr 5, 2011

An error occurred creating the form. See Exception.InnerException for details. The error is: Object reference not set to an instance of an object.

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I have a button that is supposed to display a form:

[Code]...

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In the main form the user can choose to download information from a device.Since this request takes time, when "download information" is pressed I open new form in a separate thread: Private Sub RunDownload()

[Code]...

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I would like to know the event order of form which is executed while opening form. I am showing my form using following code and the code in form_load event executes twice. Once when the form variables are initialised and second when form is displayed. I want it to execute once only. form showing code:

[Code]...

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i have two tabs one is expiry date and block. my problem is, when i click block tab for 1st time it will correctly populate the datagridview. but when i click expiry date tab then block tab again, i got this error 'Provided column already belongs to the DataGridView control.'

[Code]...

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Mar 2, 2010

I'm developing vb.net application with mysql as database. The database is on other machine in the network. In one function connection opens and executes query successfully. The same function makes call to other function.This second function tries ot do same thing. But this time while opening connection it gives error-"Access denied for user 'root1'@'AZAR' (using password: NO)". Here 'AZAR' is the name of my machine. The first function uses public variable declared in module for connection, whereas second function uses local variable for connection. I'm using PhpMyAdmin tool.

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Apr 7, 2011

This is my Code

Private Sub ToolStripButton2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ToolStripButton2.Click

Dim OpenFile As New OpenFileDialog
OpenFile.FileName = ""

[code]...

Everything works but if i don't open a file it gives an error

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Aug 13, 2010

I've developed simple selection program which is now complete and in testing. The program has been sent to several users that have all experianced the same error when they run the program.T

PLATFORM VERSION INFO
Windows : 5.1.2600.196608 (Win32NT)
Common Language Runtime : 4.0.30319.1

[code]....

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Jul 2, 2010

I cannot open and read files larger than 32k. This sub is used by both user-dialog and drag-drop operations. Files smaller than 32k are processed without error. Files greater than 32k result in the ErrorOpenFile warning with "Overflow" as the err.Description being displayed.

Public Sub SendFile(ByVal sendFileName As String, terminalWindow As Form)
Const MSG_TITLE = "Send File"
Dim asciiCode As Byte

[code]....

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I'm receiving an error I can't seem to figure out. I'm opening an image to Photoshop and the highlighted line is the cause. The file opens but closes automatically straight away.[code]...

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What do you think is wrong with the commented line in my vb.net code below? it returns the error message "member not found".[code]...

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Apr 30, 2009

The program i'm running doesn't seem to open the database in stead I get this error:"A network-related or instance-specific error occurred while establishing a connection to SQL Server. The server was not found or was not accessible. Verify that the instance name is correct and that SQL Server is configured to allow remote connections. (provider: SQL Network Interfaces, error: 26 - Error Locating Server/Instance Specified)"ErrorCode=-2146232060Is there a way to fix this error.

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Jul 10, 2009

I reinstalled my VS2008. But now everytime I open my project this warning always appear. where should i go to avoid this?

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VS 2010 Error Opening Excel In A Dll?

Apr 25, 2012

We have created a dll to convert an excel spreadsheet to a csv file. At the moment we open the xls file, an eror occured (file doesn't exist / is used by an other user)

Used
Dim excel As New Microsoft.Office.Interop.Excel.Application
Dim wb = excel.Workbooks.Open("d:my.xls") '<<<<<<<<<<< not possible to open
wb.SaveAs("d:my.csv", Microsoft.Office.Interop.Excel.XlFileFormat.xlTextMSDOS)
wb.Close(SaveChanges:=False)

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Error Opening Excel File From .net 2010?

Aug 26, 2009

Dim excel As New Microsoft.Office.Interop.Excel.Application()
Dim wb As Microsoft.Office.Interop.Excel.Workbook = excel.Workbooks.Open(txtFileLocations.Lines(w))
Dim ws As Microsoft.Office.Interop.Excel.Worksheet = TryCast(excel.ActiveSheet, Microsoft.Office.Interop.Excel.Worksheet)

when the program tries to opens an excel file, it always throws me an error "Office has detected a problem with this file. Editing may hard your computer" and my program crushes.......The problem appears on the SECOND line, on DIM wb...blahblah.. i went to the office and unclicked the "protected view" checkboxes.. but it still throws me those errors. my guess is that the office i have in the computer is not the same as the one that my program uses to open excel files (i mean, i loaded/imported some excel.dll files in the program so i guess that will be the one) But how do i make the program not care if the excel file is "potentially dangerous"?

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Error Opening Excel File From 2010

Jul 26, 2011

[Code]...

when the program tries to opens an excel file, it always throws me an error "Office has detected a problem with this file. Editing may hard your computer" and my program crushes. The problem appears on the SECOND line, on DIM wb.

[Code]...

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Office Automation :: Error Opening Excel In A Dll?

Apr 25, 2012

We have created a dll to convert an excel spreadsheet to a csv file. At the moment we open the xls file, an eror occured (file doesn't exist / is used by an other user)

Used code:
Dim excel As New Microsoft.Office.Interop.Excel.Application
Dim wb = excel.Workbooks.Open("d:my.xls") '<<<<<<<<<<< not possible to open
wb.SaveAs("d:my.csv", Microsoft.Office.Interop.Excel.XlFileFormat.xlTextMSDOS)
wb.Close(SaveChanges:=False)

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RPC_E_SERVERFAULT Error On Opening An Excel File In Asp.net

Apr 13, 2011

I'm trying to open an Excel file to get and set some values. Unfortunately, I have no choice, I must to work with Excel.

Dim xAp As New Microsoft.Office.Interop.Excel.Application
Dim xWkb As Microsoft.Office.Interop.Excel.Workbook

xWkb = xAp.Workbooks.Open("c:uploads este.xls")

Always I have this exception: (Exception from HRESULT: 0x80010105 (RPC_E_SERVERFAULT))

Need I Excel installed in server machine to open Excel files? I don't think so, because when I create a new application and workbook throught code, all things go right, but... its a possibility...

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Sql Server - Error Opening SSCE Table?

Dec 19, 2011

I am having problem in opening and viewing data in my SSCE table. There are 3 tables in it, two are working fine but one is causing trouble. I dropped the table and created a new one (same name) but again, the problem is the same.Please see the problem message below:

The select statement:
SELECT [PK], [AdmissionID], [Session], [Medium], [DateEnr], [FeeStatus], GuardianNIC], [FatherOccupation], [FatherIncome], [Cast], [Religion], [MotherName], [Address1],

[code].....

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When opening an SQLite connection, I get the following error: Here is my complete code:

[Code]...

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Oct 24, 2009

I have an old app, a VB5 front end with access 97 databases all works Ok using the ...program files... folders in XP but I now have a user on Vista and we have problems opening up, and I am braced for problems saving and closing down, if we ever get there.

I sent him a c# applet which found the users folder using string Dpath = Environment.GetFolderPath(Environment.SpecialFolder.LocalApplicationData);

I have moved the data and all settings files to a folder C:Users[Username]AppDataLocal[My app Name][My app data Path]

The start up routine checks a settings file uses the path in the settings to re-attach the front end database to a backend database, test to see if the database uses replication and set the default data path for the rest of the app. we are failing somewhere in here I am sure. I have checked and there are no updateable files in program files

Have I got the wrong path or is there something else I should be looking for?

I have an vs2008 version of the app which is using a similar location but a SQL server database- no problems

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Error Opening Excel File Read Only ODBC?

Sep 25, 2009

Error Opening Excel File Read Only ODBC

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Dec 28, 2010

When I attempt to open the visual basic window in PowerPoint 2010 I get the following message:STDOLE2.TBL could not be registered.  What causes this and how is this fixed?

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Method Of Object Failed Error While Opening Any Vbp File In VB 6.0?

Nov 10, 2010

Whenever I open any VBP file in Visual Basic 6.0, I get Method '~' of object  '~' failed error. After that project compiles without any error i.e I can create either EXE or DLL without any error. Originally, all files are Visual Basic 5.0 vbp files and we are converting Visual Basic 5.0 to Visual Basic 6.0. We will be converting to .Net after converting to VB6. Application uses microsoft access as data storage.I am running Windows XP on my machine. I have got .Net 3.5, Jet 3.5 Sp3, Microsoft Office 2003 installed on my machine. 

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Opening And Saving Word Doc - Error When Visibility Turned Off?

Jun 11, 2011

I am opening a word document and saving it as html with the following code. If i set the objWord.Visible = False , i get an error: Exception from HRESULT: 0x800A1098 , which i believe indicates there is nothing to open.

Protected Sub btnUpload_Click(ByVal sender As Object, ByVal e As EventArgs)
Dim objWord As Microsoft.Office.Interop.Word.ApplicationClass = New ApplicationClass()
If Not (fUpload.HasFile) Then

[code].....

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Mar 9, 2010

when i double click my dbml file at the solution explorer, I get this error: the operation could not be completed. unspecified error I'm working on a VB.Net project, using visual studio 2008, mssql 2008.

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VS 2005 Opening And Saving Text Files Error

Jun 11, 2009

A query concerning opening and saving a file.i have two commands, one the opens and another that saves [the same file].i'm using the StreamReader and StreamWriter methods.issue is this:if i comment out the open code, the save works fine.if i comment out the save code, the open works fine.if i let both run together, i get an error, usually with the save saying that the file could not be accessed. note, before anyone asks, i do close the file after saving or opening what could be the problem? open works fine, because it usually happens prior to the save, and then save process cannot access the file..?

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Feb 10, 2012

There is no editor available for 'file path here'. Make sure the application for file type (.vb) is installed. This is the error that I get when I try to open a project I did a while back in VB. I tried a C# project and I can open the form for viewing fine, but for some reason VB won't work? I really don't want to do a repair on the whole application as it takes a while and I'm not even sure I have the ISO right now.

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Form Is Not Opening?

Feb 10, 2010

I have a module with Main(). I am calling a form1 from this Main(). Why Form1 is not opening. I set Main() to run at the first in my Project propertis. I am using VS2008.Net3.5 VB code.The Code is:

Module Module1
Public frm1 As Form1
Public Sub Main()
frm1 = New Form1

[code]....

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'event Log Full' Error Prevents Opening New Express Database

Feb 27, 2009

Creating a new database in a Windows Forms project (done according to one of the MSDN tutorials) results immediately in a "The event log is full" error.The database exists as an item in the project, but cannot be opened or configured (i.e.,it doesn't exist really). newly installed MS SQL Server Compact Edition,This is a new computer (though fully updated), and to my knowledge no other versions of SQL server are installed.I note that someone else has contributed a message about the exact same problem (according to a preview in the MSDN search results page), although for unknown reasons clicking on the item does not take me to that message.

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VS 2010 Error Opening Outlook / Default Mail Client

Feb 1, 2012

In a new program I'm including a button so the user can send en email with feedback.

The problem: On Windows Vista & Windows 7, an error pops up with the following message:

[Code].....

I am receiving the same error. However, on Windows XP, both of these codes are working fine. Email client used (as default) is Outlook 2007.

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Close First Form When Opening A Second Form?

Dec 12, 2011

I have two forms and a button on the first form. What i want is when i click the button the second form to show and the first one to close.But this isn't working with:

Form2.show()
Me.close

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Correct Way Of Opening A Form?

Apr 10, 2009

I am a bit confused on the correct way of opening a form. I generally practiced form1.show to open a form, but i came across the following code to open an form.[code]....

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Dec 5, 2011

I have form1 and form2 and have when a user clicks on an icon on form1 it shows form2 and hides form1. But how would I get it to when a user closes form2 it will show form1 again?

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Nov 11, 2010

I have a program withmultiple Forms and i have made a back and Forward Button so they caneasilgo back to the previous Form.My question is How do you open a random Form with a string i have googled it nd this code is the best one i have found.

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Opening Form By Type Or Name

Jul 17, 2003

How to create an instance of a form if it is not know in advance which formtype has to be opened. If you want to skip the chitchat: the .NET code example is at the end of this post. First the Symantec: when we create a new form, this form has a name. If we refer to that name, we actually refer to the name of the type of object that is just created. When to use of course when reading the subject you might think: why not just pass the form to a parameter that takes a form (or control/object)?

The answer is: you don't when it is not sure, when or if a new instance of the object has to be created or, as mentioned, when the procedure is called it is not known which class has to be created. You could of course hold a bunch of created objects, but that would be a shameless misuse of memory. Imagine the following scenario (seen something like this in a post, but can't find it anymore):

You have a class that is able to trap an event, say the doubleclick of a textbox, and has to open a form when it occurs. If it's always the same form, that's easy, but what if you want it to be determined during runtime? This is a quite common story: doubleclick on article opens the detail form of that article, doubleclick on supllier opens that particular form. If you use a form variable, how do you say to the class which form should be opened? This will not work

Code:
Dim FormToOpen as Form 'you don't want to open it right away, you want to know when the time comes what form to openFormToOpen = Form1You could say FormToOpen = new Form1, but then 1. an instance would be immediately created, even if it never will be used: memory leak. 2. you can never close the form, you'll always have to use the same instance created when setting the form. Consequently, you can never open more than 1 instance using this way.

The solution: use the type. If you know the type, the Activator class will enable you to open (and return) an instance of that form at any time and as much times as you like. (The Activotor class exposes the function CreateInstance which returns an instance of the specified object)The following code creates an instance of the type form1 and shows it.

Code:
CType(Activator.CreateInstance(GetType(Form1)), Form).Show()Or for better readability, the same code split up:
Code:
Dim FormToOpen As Type
FormToOpen = GetType(Form1)
Dim frm As Form = CType(Activator.CreateInstance(FormToOpen), Form)
frm.Show()

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I'm making a program where the user can choose a question section and the program is supposed to randomly open one of a few forms that contain questions. However, I can't get the code right.

[code...]

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