Way To Throw Multiple Exceptions
Dec 26, 2009Is there a way to throw multiple exceptions?
i tried to throw an exception in the Finally block but somehow the exception in the Finally block overrides the first exception that i wanted to throw
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How To Throw Custom Exceptions
Sep 24, 2011I am catching sql exception from databse as shown below.[code]Now I want to throw exception by adding some userfiendly information,Like below.Throw SQLexception + "my message.....".
View 8 RepliesThread Safe To Throw And Catch Shared Exceptions?
Jan 25, 2010so i have a Method that is going to made Thread Safe. can i have something like this in the Method:
Public Class Q Private Shared ASD As New MyException("") Public Sub W Throw ASD if multiple threads attempt to throw the Shared exception ASD, will there be an error in the catching part? The alternative of course is to: Throw New ASD but i'm just checking to see if the first way is thread safe
Throw System.Exceptions From Within Custom Classes To Calling Code
Jul 9, 2010I Have just been watching a video on throwing Exceptions. Are you supposed to throw System.Exceptions from within your custom classes. to the calling code, Which other way can they communicate. I have read in several places it is bad practice to throw SystemExeptions.
View 3 RepliesExceptions - Can The "Throw" Statement Exist In A Block With No Try/catch Statement
Oct 5, 2009how to use them then before, but am still a little confused with a few aspects. Here goes:
1.) Lets say you have a method that checks for a certain condition(s) and if it fails Throws an exception. Does it have to be in a try/catch block? Meaning can the "Throw" statement exist in a block with no try/catch statement?
2.) Now lets say we have a method that has a try catch block and in it there is a throw statement. When the throw statement is executed does it first try to find an appropriate catch block in the same method or does it immediately go back to the calling method without looking at the catch statements in the current method where the exception was thrown?
3.) I created a custom exception class that inherits from ApplicationException. Next I created a method which has a catch block that catches this type of exception and does some action. Is the System(i.e CLR) smart enough to throw an exception of this type, or does it only throw exceptions from SystemException?
4.) I know that some people are more liberal in their use of exceptions and others use it more sparingly when truly strange stuff happen like the DB going down. I am writing code where I am getting some info back from the database, converting it and then storing it. Sometimes there might be data that comes back from the database and other times the field is empty and the Null value comes back. Therefore in the instances where Null comes back from the database I should not convert the value to anything, since I will get an error. What should I do in this situation? Should I let the CLR throw the exception when it goes to convert the Null value or should I check for the Null value and if it exists not convert?
5.) In general when I throw exceptions, is it sensible to only throw exceptions of the type Application Exception or are there instances where the programmer throws exceptions of the type SystemException?
Exceptions Must Be Exclusive - Exceptions Will Ever Occur Simultaneously ?
Dec 26, 2009I've just skipped around a few inbuilt VB classes' methods which throws exception. of all that i've came across, methods may throw multiple exceptions but ALL of them are exclusive, meaning there is no way 2 exceptions will ever occur simultaneously, yea and i was trying to make my class throw 2 exceptions simultaneously, hence this question, must all exceptions be exclusive?
View 1 RepliesMultiple Runtime Exceptions When Clicking Run From Task Scheduler / Works Fine Running Application From Project Folder
Jun 3, 2011So I wrote a VB.net project in Visual studio.I have a scheduled task that is set to run the program every morning at 10AM. If I use windows explorer and double click the application, it runs fine.If I open task scheduler, open the task properties, and browse to the application, then choose run, the program fails, due to Runtime exceptions.I know I have the path entered correctly, since I can debug the instance when it crashes from the task scheduler. VS2010 pulls up my source code.The exception is System.IO.FileNotFoundException, remember, it works fine when I double click the app. If attach a debugger to the process after it is executed from the task scheduler, I can then restart the debugger, and Voila!, The application runs fine.
View 1 RepliesControl Key + S To Just Throw Up A Messagebox
Mar 8, 2011i have vb 2005 and i dont know how to make Ctrl+S work so that it throws a messagebox on the screen.ive tried a couple of different threads, looking for my answer and i cant seem to find it. its just a simple application, but i want to spice it up a bit with a shortcut to save the info on the screen.i dont want to deal with the saving part yet, but just to get vb to recognize that the user pressed the Ctrl key and the s key in combination.
View 5 RepliesCatch / Handle And Then Again Throw Exception?
Jun 26, 2009I ran into an interesting dilemna today. I have a function that handles information and checks for duplicate values, then returns the next number that is not a duplicate. So, I have something like this:
Public Function GetNextNonDuplicateNumber(NumberToCheck as Long) as Long
//the non-duplicate the function will return
Dim NonDuplicate as Long
'duplicate
If CheckForDuplicate(NumberToCheck) = True Then
Throw New DuplicateException()
[Code] .....
As you can see, I want to handle the exception specifically, but I also want to throw it when I'm done because I want to alert other code outside the function. The problem is that simply throwing it exits out of the function with a null value.
Connect To Oracle Throw The Internet?
Mar 31, 2009[color=#CC66CC]hiiiiiiiiiiiiii every one[/color]
[color=#FF6666]
how can I connect to oracle 10g XE database throw the Internet using Visual Studio .Net? I mean how can I get what I want from my DB using the Internet and what is the compatible version of Visual Studio .Net with oracle 10g XE?[/color] [color=#330033]I wanted to work with oracle Jdevloper but I could not understand anything realy and could not find somthing to show how to start it even :blink:?
Function Throw A Nullreferenceexception Only When Compiled?
Jan 26, 2010This one has me completely confused. I'm using the function below in a .vb file (it's the only function in the file as of right now).
[Code]...
Loop Throw All Usercontrols In A WinForm?
Jul 14, 2011Is it possible to loop throw all usercontrols in a winform.
I wanna run this treatment within a for each and it loop all usercontrols
Usercontrol11 is one of 20 usercontrols existing in a form (usercontrol11,usercontrol12, etc )[code]...
Series Of Commands, Any Of Which May Throw An Exception?
Jun 17, 20101) How is ON ERROR GOTO -1 used? I don't understand the help text.
2) ON ERROR seems to be deprecated. What is the recommended Try...Catch replacement for ON ERROR RESUME NEXT. ie. where I have a series of commands, any of which may throw an exception, and I want to ignore all exceptions yet attempt every command?
ShowDialog Throw Thread Exception
Feb 18, 2011I have written a VB.NET 2.0 code and in my code i am calling class.Showdialog and for that i am getting thread exception. I have mentioned the call stack of the exception. Can any one help me out to resolve this issue. [code]
View 5 RepliesThrow A Message Box If An Error Occurs
May 4, 2009I wanted a Message Box to appear when a file can't be found, for example. I made a Combo Box (ComboBox1) and a button, this is what the code was:[code]If a file can't be found, I want a message box to appear, not an Error Provider, I tried this code, but it did not work:[code]
View 2 RepliesVS 2008 Sending SMS Throw Gmail
Jan 10, 2011I think I have a problem with the provider smtp.Is this the problem? why cant I send SMS? [code]
View 21 RepliesWhy Does Code Throw A Generic Error In GDI+
Jul 28, 2011I'm trying to convert a batch of .pngs to .jpgs, as in this question:
[Code]....
The call to jpg.Save, however, with a "generic error" in GDI+. Originally outside of the innermost Using statement, I moved the call inwards as per this answer, but it didn't change anything. I have verified that newfile contains a valid path, and that the program has write access to the directory. What am I missing?
Why Does This Extension Method Throw A NullReferenceException In .NET
Mar 8, 2010From previous experience I had been under the impression that it's perfectly legal (though perhaps not advisable) to call extension methods on a null instance. So in C#, this code compiles and runs:
// code in static class
static bool IsNull(this object obj) {
return obj == null;
}
[code]....
The debugger stops right there, as if I'd called an instance method. Am I doing something wrong (e.g., is there some subtle difference in the way I defined the extension method between C# and VB.NET)? Is it actually not legal to call an extension method on a null instance in VB.NET, though it's legal in C#?
.net - Exception Handling: Is Finally Executed After Throw?
Oct 16, 2009Assume you have the following code:
Instead of doing:
Try
'
[code].....
.net - IsNumeric Throw FormatException While Evaluating An Object?
Apr 5, 2012I'm working with visual studio 2008 developing software for windows CE 6.0, compact framework.I'm having this "strange?" trouble with isNumeric method. Is there another better way to do this job? Why is getting me an exception? (two in facts...both of type FormatException)
dim tmpStr as object = "Hello"
if isNumeric(tmpStr) then // EXCEPTIONs on this line
// It's a number
else
// it's a string
end if
.net - Why Does XmlDocument.LoadXml Throw System.Net.WebException
Sep 12, 2011Why does System.Xml.XmlDocument.LoadXml method throw System.Net.WebException ?if MSDN was right, LoadXml should at most give me a System.Xml.XmlException.Yet I have weird exceptions like:The underlying connection was closed: The connection was closed unexpectedly.
Dim document As New XmlDocument
document.LoadXml("<!DOCTYPE html PUBLIC ""-//W3C//DTD XHTML 1.0 Transitional//EN"" ""http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd""><x></x>")
MsgBox(document.LastChild.Name)
IDE :: Throw Unhandled Exception During Debugging (VB2008)
Apr 24, 2009while my first .net steps I want to understand and test the Method
Private Sub MyApplication_UnhandeledException in ApplicationEvents.vb.
But if I throw an exception the IDE stops and says "unhandled exception" and gives solution tips.
Is it possible to switch off those exception warnings and run through the unhandeled exception handling in ApplicationEvents.vb ?
Throw Exception When Certan Property Or Value Is Negtive?
Feb 9, 2012I'm not getting any errors, or anything I just forgot how to do error checking in the "set" portion of properties
I have 3 Classes, my frmMain,Sales and a Validator Class
Code for the Validator Class:
CODE:
Code for my Sales Class:
CODE:
I need to Throw an Excepton when the Sales price is Zero or negitive and when the trade in allowance is negtive I'm not quite sure how to do that in the Object Oriented Manner.
VS 2008 Anyway To Access Those 'objects' And Just Throw It On Screen?
Oct 22, 2009url...If you check out the images on that website you will notice that in their program, it has the textbox and user icon thing and everything and they have transparencies set.Is there anyway to access those "objects" and just throw it on the screen? How exactly are they doing that? Did they make their own graphics? And if they did, how are they letting it do the transparency, because I know laying a picturebox over a picturebox won't accomplish that.
View 10 Replies.net - Does Not Throw Compiler Error When Setting Dictionary To IList
Jul 6, 2011I am updating a legacy application, and it was reading a dll from another project for a Dictionary(of Guid, String) of items and using them.
The requirements have changed, and the method that was returning the Dictionary is now returning an IList.
This is the odd behavior of this; the intellisense is not throwing a cast error, nor is the compiler. It does not throw an error until runtime when it tries to set the Dictionary to the IList.
Example:
Dim someDictionary As Dictionary(Of Integer, String) = New Dictionary(Of Integer, String)
Dim someList As IList(Of Integer)
someDictionary = someList
why the compiler is not catching this?
Microsoft Intermediate (MSIL) Instructions Throw OutOfMemoryException
Dec 26, 2009from the vb web:
Quote:
The following Microsoft intermediate (MSIL) instructions throw OutOfMemoryException :
*
box
*
newarr
*
newobj
Does anyone knows what exactly does box means? and also is there anyway this statement will cause an outofmemory: Dim a As Boolean
What about if its just an empty object: Dim a As someobj
Throw An Existing Exception While Preserving Its Stack Trace In VB?
Nov 18, 2011If I have an existing exception object (I'm not in a catch block, I just happen to have been given an exception object), is there any way (re)throw it while preserving it's stack trace?
The context for asking is that I'm writing a RunWorkerCompleted handler. If an error happened while running the background task, then this will have shown up in the Error property of the RunWorkerCompletedEventArgs. To keep the code simple I want to use the same error handling code to trap this, or any error that happens later during the handler. That means I need code like this:
Private Sub OnDone(ByVal sender As Object, ByVal e As RunWorkerCompletedEventArgs)
[Code]...
I don't think that using an InnerException here (ie. saying something like Throw new Exception(ex)) will work because then I have the problem that my Catch block has no way of knowing whether the exception it's supposed to be handling is the outer one or an inner one. StackOverflow seems to have various similar questions, but I've not found anything that describes this particular situation.
Throw In Asp.net - Run The DerivedPage - My Log File Lists The Error As Line 7
Apr 14, 2011Below, why doesn't Throw maintain my originating line number? If I run the DerivedPage, my log file lists the error as line 7. Shouldn't it say line 4? It would make sense if I had Throw ex, but I don't. Isn't Throw by itself just supposed to rethrow and bubble up the error? If I remove the Try...Catch block entirely in DerivedPage, then my log file correctly lists 3 as the error line, but I am not able to log any info in case of an error. What can I do to maintain my DerivedPage, and still have my log keep the correct line number?
Public Class DerivedPage Inherits BasePage
Page_Load(o,e)
Try
[CODE]...
Base page:
Public Class BasePage
Protected Overrides Sub OnError(e)
MyBase.OnError(e)
[CODE]...
Log.Error does output the InnerException if it exists. It does in this case. However, the stack trace for the InnerException doesn't contain a line number, just the Exception details.
VS 2005 - Throw An Exception When Print To The Printer Using The PrintDocument
Oct 29, 2009When I print to the printer, using the PrintDocument, I want it to be able to throw an exception if there is a problem. Currently, if I print to a printer that has a jam, is offline, or doesn't even exist, VB still thinks it printed fine. I never get an error. How can I have the printer report back to my program so that if I print to a printer that doesn't even exist, it wont let me do it? I just tried adding a LPT1 printer to my computer (and there is no local printer). I called it some random printer and installed some random driver. Then used my program to print to that printer and never got an error.
View 1 Replies[2005] Throw Exception - Used Methods From Namespace System.IO
Mar 12, 2009I want to throw error, if i used methods from this namespace System.IO
For example,
If i write File.Delete("TempPath") , i have to throw undefined Method..