I've a little problem to how manage a TCP client exception. I've declared a client in Form1 as described below:
[code]...
I want to manage the Exception (ie when my client is offline) by Try..Catch, but unfortunally inside Form1 I can't. How can I bypass this problem?
I have a form that I am managing, works well, but now I am thinking about using a usercontrol embedded in the control form. Is it possible to manage the same form through an usercontrol on the control form? Dont think I phrased that right, say if you had form1 that loads(manages) form2, which I can do, how can I manage form2 with an usercontrol embedded in form1? Is this possible?
View 1 RepliesI have the following problem, a table "table1" contains 10000 telephone numbers, this table is source for 5 combo box contained in a form, I need that when I select the first tel N in the first combo, this number is not any more available for the combo 2, when I select the second number in the second combo, the first 2 numbers of the table 1 are not any more available for the combo 3 etc. Every record (in form) contains 5 combo. The Tel N selected into the combo are source for other table called "table2". I've try with all the type of query between table 1 and table 2, and use the result as source for the combo, I've try with IIf but this is works only for the first combo.
View 3 RepliesI have a solution with two applications in it. One is a windows form application that I want to use to set and manage a windows SERVICE application app settings.
For example. The form has the database connection string on it, when updated. The windows service application settings are updated.. I can get it to work for the windows application, but I need to jump boundries to the other application( Windows Service) and update the app settings there.
I using Microsof Visual Basic 2008 Express Edition. I need to create a form like: 2 buttons are open and save existing .xls file which each generation can choose a different.2 textbox that can be entered on the column
and last button to when choose two columns, to find duplicates values and mark different color same values. Is it possible?
At the moment Excel file opens, but the comparison does not require the introduction of the columns
how to manage a class relationship I have these objects: A Layouts collection which implements a BindingList of Layout.A Parameters collection which implements a BindingList of Parameter. Each layout is to hold a set of settings, as defined in the Parameters Collection. Each layout should have a setting for every parameter, but the choices are constricted to the list of possible settings, kept in the Parameters object. For each setting there is only a single value. So it would look like this:
Layouts' Layouts; Collection [BindingList(Of Layout)]
Layout 1' Layout; Collection [BindingList(Of ...?? )]
Color Red' Parameter Key, [referene to parameter object..or..?]
Time Hour
Now, when I create a Layout object, I shall be restricted to chose one setting from each parameter, as already defined in the Parameter object, and assign to my layout object. And if I add/remove parameters, parameter settings, or the setting values, that should reflect in each layout; set to a default value, or deleted.
what type of class/object relationship shall I use for this Layouts collection in respect to the Parameters collection? I have no good understanding of the terms such as "inheritance", "implements", "interface", "abstract class" etc.. So I'm not able to see what concepts I need to study to make this come together nicely. Of course I could make a bunch of manual methods that keeps track of these things, but I have a feeling that I should make some type of relationship between these collections, which can make this somewhat easier..? I want to keep the collections as BindingLists down to the lowest level, in order to have two-way databinding with the UI controls.
What would be the best way to manage multiple Picture Boxes?I am thinking an array, but if that is so, how would I build this array, and what would be stored in it?
View 1 Replieshow I would be able to make the click of a button scan a certain directory for certain files like .txt files, and display those files in a text box, or if not a text box some other viewer.
View 7 RepliesI have a function which does some processing. Lets name that function DoWork. This function takes some inputs as structure and a string. Now I want to start two threads which would read some elements in an array and then call DoWork with some data and value of that element. DoWork would do processing and thats it. I want two threads to run side by sid.
So I tried to write code but kinda failed. I wrote a function which starts a thread and calls DoWork. Now DoWork accepts structure and string etc. But when we do say abcthread = new threadig.thread(addressof <sub name>). here we cant pass any-value except object. That was first problem.
Anyway, main problem is after the thread has finished processing DoWork, how do I find that out and tell that thread to take another element from array and start again. This has to be managed for both the threads. I need to find out which thread has finished first and tell it to start again with another value. I have usually used one thread but not two in this way.
It is possible to catch an exception and throw a new exception which wraps the first exception as an inner exception: [URL] Also, if I call a function and it throws a certain error, but I catch it, will the calling code's catch handler execute? If so, and it is of a higher exception type, is this not wrapping the exception? eg I can throw exception ex of type IndexOutOfRange, log it but rethrow, catch a higher up exception and do something, or I can throw a new exception and wrap an inner exception like:
View 1 Replieswhen i try to run my form it says:An error occurred creating the form. See Exception.InnerException for details.The error is: Cannot create ActiveX component
View 5 Replieshenever I attempt to open a form, an error has been popping up;
An error occurred creating the form. See Exception.InnerException for details. The error is: Index was outside the bounds of the array.
For simple code like;
formbooking.show()
Whenever I reference this form in anyway, that error pops up. I haven't done anything related to that form recently and I don't know what the problem is.
How do i go about creating an exception handler when i want to login to my form to access the rest of my forms. The username and password are linked to server.What if it doesnt connect to server? here is coding for me to login:
Private Sub btnLogin_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnLogin.Click
If (txtUName.Text = "-") Or (txtUName.Text = "0") Or (txtUName.Text = "") Or
[Code]....
I wrote this application in VB2008 and it ran for three years without problems(It had one first chance error during that time but ran correctly). I started having problems at the first of this year with a textbox not showing the update for the date code correctly. So I thought that maybe some update to the system had changed and I might need to do some code changes to take into account for these updates.I first tried to convert it to 2010 but the conversion would not operate correctly even though the code showed to be correct.It would jump from one form to another in the middle of a if statement using debug to step through the code. the if statement would just test for a variable to be less than 2 and then be changing the text in a textbox. So I decided that It would take longer to correct the converted application then to just use VB2008.
So I went back to VB2008 and my XP to find out why the date code had quit working. This code had been working correctly for three years.I was thinking some of the code used had become outdated in some way, because a copy of the original source would not run in debug mode correctly. It showed the same problem of not updating the textbox. I stepped through debug and found that it was doing the same thing as the VB2010 version and jumping in the middle of the if statment. So I rewrote the code and used the format string command to build the date code in stead of the seerating out the date into 3 variables using a split statment.This works for the textbox problem and stoped the jumping to a different form. But since I have went back to the original code I have the first chance errors comming up.
I have several first chance exceptions being thrown from debug. This happens when I fisrt start the debug and I have put break points all through the applicatins to try and find the problem I have also enabled debug exceptions Common runtime thrown and it still gives the exceptions but no break point.I have option Strict on. There is no errors or warnings showing after a build. I have cleaned the solution and exausted all my methods of troubleshoooting this problem.The following is what I am recieving while in debug mode in the immediate window.
A first chance exception of type 'System.IndexOutOfRangeException' occurred in LABEL MAKER 2 Forms.exe
A first chance exception of type 'System.IndexOutOfRangeException' occurred in LABEL MAKER 2 Forms.exe
A first chance exception of type 'System.IndexOutOfRangeException' occurred in LABEL MAKER 2 Forms.exe
A first chance exception of type 'System.IndexOutOfRangeException' occurred in LABEL MAKER 2 Forms.exe
A first chance exception of type 'System.InvalidCastException' occurred in Microsoft.VisualBasic.dll
A first chance exception of type 'System.InvalidCastException' occurred in Microsoft.VisualBasic.dll
Now if I run this as a published application I get the same error as the first one on the above list and it gives a error window with continue, exit,and details, if continue is pressed it will allow me to continue and the application runs correctly.The details just say basicly the same as the error with no error number and that the error was in my application.exe. Nethier of these errors will give a break point so that I can find the problem. The problem does not appear to be in my code because this happens before the first form appears.
I am inheriting my class from a form that has a handler for FormClosing (it's overridable so I can override it and do MsgBox("Ha") there before calling the base method). In my Shared Sub New() I have:
' Add the event handler for handling UI thread exceptions to the event.
AddHandler Application.ThreadException, AddressOf Application_ThreadException
' Add the event handler for handling non-UI thread exceptions to the event.
AddHandler AppDomain.CurrentDomain.UnhandledException, AddressOf CurrentDomain_UnhandledException
'For Console applications you should use the System.AppDomain.UnhandledException event
AddHandler Thread.GetDomain().UnhandledException, AddressOf CurrentDomain_UnhandledException
If I throw an exception in my form outside of a try/catch I am noticing two different behaviors: If I am using the VS debugger I get an unhandled exception and it seems that my unhandled exception handler is called. The formClosing event handler does not seem to be called. If I am NOT using the VS debugger then the FormClosing Handler is being called but the Unhandled Exception handler isn't called. Ideally I would like (in both cases) to have the Unhandled Exception to be called and then the FormClosing event handler to be called.
I get this error when attempting to debug my form, I cannot see where at all the error could be (also does not highlight where), an error occurred creating the form. See Exception.InnerException for details. The error is: Object reference not set to an instance of an object.
Dim dateCrap As String = "Date:"
Dim IPcrap As String = "Ip:"
Dim pcCrap As String = "Computer:"
Dim programCrap As String = "Program:"
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I get an exception when I launch a form in my program:An unhandled exception of type 'System.InvalidOperationException' occurred in Testing 7.exe Additional information: An error occurred creating the form. See Exception.InnerException for details. The error is: Object reference not set to an instance of an object.I know that this means that there is something wrong with my code, but I checked, and I haven't found anything that I would know is 'not set to an instance of an object.' Here is the code:
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I have a class called Truck and a form called frmTruck I have some code like this in a method. It recieves obj as Truck
Dim ms As New MemoryStream(1000)
Dim bf As New BinaryFormatter(Nothing, New StreamingContext(StreamingContextStates.Clone))
bf.Serialize(ms, obj)
To simplify my code, I have basically something like this for frmTruck:
public class frmTruck
private truckValue as Truck
public sub DoSomething()
[code]....
During the LoadTruckFromDatabase function I call the SerializeTruck method, here everything goes fine. But when I call the SerializeTruck just before End sub of DoSomething, it goes wrong I get an exception saying that frmTruck is not serializable My truckinstance doesn't have any references to frmTruck...
I have a form with a button that brings up a different form. In some versions of this program (don't ask), the second form is shown non-modally, but in my version it is shown modally. The point of that last statement is that the second form can be either modal or non-modal, so an answer needs to handle either one, but the modal option is more valuable.If form 2 throws an exception that is not handled, the exception is caught somewhere on Form1, though the exact place that it is caught is largely dependent on where the exception was thrown from. The question is this: I need a means to trap all exceptions raised on Form2 or anything called from Form2 such that no exception EVER propagates out of Form2 to be caught in Form1. The reason for this is that Form2 HAS to perform some cleanup for reasons that I have zero control over. That cleanup doesn not absolutely require user input, but it would be good to have some.Is there any event that is fired if a form is exited due to a call stack unwinding as an unhandled exception propagates up the stack?
View 7 RepliesI developed an app, tested on few computers and all seemed fine. But now, some people suddenly get an error, which I can't repeat on my computers. Part of the exception:
** Exception Text **
System.TypeInitializationException: The type initializer for 'NumoABC.functionsBurtuSummas' threw an exception. ---> System.InvalidOperationException:
The form referred to itself during construction from a default instance, which led to infinite recursion. Within the Form's constructor refer to the form using 'Me.'
at NumoABC.My.MyProject.MyForms.Create__Instance__[T](T Instance) in 17d14f5c-a337-4978-8281-53493378c1071.vb:line 180
at NumoABC.My.MyProject.MyForms.get_MainForm()
[Code] .....
The If Me.Created = False Then is because while the form is loading, some events fire the updatePersonDataHandlers() sub, but I don't want it to happen until form is fully loaded. In the module functionsBurtuSummas line 2
Module functionsBurtuSummas
Private f As MainForm = MainForm
I have many modules who work with the MainForms' controls, so I use a private variable f to refer to the MainForm.
I have a simple form that when filled out with a case # will return the name of the person that is handling the case. I am getting an error on any machine that does not have VS 2010 installed on it. The error is when ever the user uses the close button (the red X) at the top right of the form the following error is generated:
System.InvalidOperationException: Collection was modified; enumeration operation may not execute.
at System.ThrowHelper.ThrowInvalidOperationException(ExceptionResource resource)
[code].....
in my machine it works fine, when i run program on another machine it gets error:
An error occurred creating the form. See Exception.InnerException for details. The error is: Could not load type 'Microsoft.VisualBasic.PowerPacks.ShapeContainer' from assembly 'Microsoft.VisualBasic.PowerPacks.Vs, Version=9.0.0.0, Culture=neutral,
I have written an application but it didn't work here on my pc and unhandled expression occurred when I execute my program then this error is occurred.
"System.InvalidOperationException was unhandled
Message="An error occurred creating the form. See Exception.InnerException for details. The error is: Unable to cast object of type 'System.String' to type 'System.Byte[]'."
Source="E-Photographer"
[Code] ....
List View is already added for the purpose of thumbnails. I also need thumbnails when I click on root of the treeview and I also want to show image in the picture box when I click on node(photo). I need my code such as that it can display thumbnails on List View and pictures on Picture Box.
here is mt code it was working great till i closed my computer and go to sleep then when i wakeup i found that the form that i was working with not working
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im making a simple blackjack game. im not using pictures or anything, just using alt + 3-6 to make these symbols: everything was going great up until a little while ago. it worked fine, then i added a timer to tell who wins and some code for it. im stumped, and i know i could make this code 50x more elegant but i dont care that much,....the exception is: 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:
Public Class Form1
Dim unused(52) As String
Dim dealcards As Integer = 2
[code]....
I have installed MSSQL Server 2008 on a new machine. An application developed in .net 2008 thorws the above mentioned error. I am using the Windows Authentication mode in SQL. Does anyone have an idea how i may fix this error. Is it related to the authentication mode? this s my connection string: Data Source=SERVER_NAME;Initial Catalog=MyCatalog;Integrated Security=Tru.[code]
View 5 RepliesI've been trying to get this code to work for quite some time and for the life of me I just can't see the error.I'm including the error details below. If I need to add more for clarification, PLEASE let me know.I need to try to figure this out ASAP!
[Code]...
An error occurred creating the form. See Exception.InnerException for details. The error is: Failed to initialize because CategoryName is missing.
View 12 RepliesI have had to buy a new computer but only OEM Win7(x64) is available in UK at present. Everything has installed OK but when I cam to try and run a programme that ran OK in Win7-32bit I got the following error message System.InvalidOperationException was unhandled
Message="An error occurred creating the form. See Exception.InnerException for details. The error is: is not a valid Win32 application. (Exception from HRESULT: 0x800700C1)"
[Code]...
Got a proccess thread thats in charge of loading a listbox full of the first line of text for richtextbox items on form load. Though I use Me.Invoke(New MethodInvoker...) to add items on the main thread so its thread safe it coughs when the first line of rtf data are thrown at it, acting as if I hadnt called adding the items on the main thread.
Up at the class level:
Dim Worker As System.Threading.Thread
In the load procedure for the form:
Worker = New System.Threading.Thread(AddressOf WorkerDo)
Worker.Start()
[Code]....
I"ve also tried to remedy this using a delegate to invoke the listbox before attempting to update it, but the invoke method itself is throwing the exception. I am not using the default instance of the form (a new instance of this form is created). Anyone know how I can get around this? I can't load the listbox full of items directly in the form's load procedure because work takes place in the thread beforehand so there are strings to add to the listbox. I've got MS Visual Studio 2008 Pro and Vista SP2 (latest updates applied).
