Return Value From A Try Catch Block?

Mar 1, 2009

how do i make sure -1 is returned if an error occored?

Public Function ExcecuteNonQry(ByVal sql As String, Optional ByVal connectionString As String = "")
Dim returnVal As Integer = -1

[Code].....

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Sql - Use A Try And Catch Block In .net?

Mar 19, 2011

For the code shown below, how would I use a try/catch block to handle an error if it were to occur?

TOTKILO.Text = KILO.Text * TOUCH.Text * 0.01
TextBox10.Text = TextBox9.Text * TextBox8.Text * 0.01
K = Math.Round(Val(TOTKILO.Text) - Val(TextBox10.Text), 5)

[code]....

I used VB.Net controls and LINQ to SQL to perform all Updates and Inserts, so when an error occurs I want to show "Enter Data Correctly", how do I do that once I catch an exception?

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Asp.net - Catch Block Not Catching?

Aug 8, 2011

I have a simple function which tries to get a value from an Obout grid filter column, and if the value is empty, ignores it and moves on. For some reason this code ignore my catch block and always shows a System.FormatException when the input string is empty More bizarre, if I use visual studio's debugger and set a breakpoint on that line, the catch block functions normally (after I continue from that line). I have already confirmed that my Debug | Exceptions | CLR are not set to catch when thrown. I have also confirmed this same behavior in the production version.

[Code]...

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Asp.net - Try-catch Block Still Be Throwing An Error?

Apr 23, 2010

Why would my try-catch block still be throwing an error when it's handled?[code].......

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Catch Exceptions In Finally Block?

Oct 13, 2010

Is there some special way to catch exceptions in finally block ?

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WebException Not Caught In Try/catch Block?

Feb 3, 2011

I've tried to Google this problem, but haven't found any relevant results.I am trying to handle HTTP 500 errors when logging into a web service (the web service returns 500 when login is incorrect). An WebException is thrown, but I can't seem to catch it properly. The exception is highlighted in green instead of the normal yellow (having trouble finding info on this as well)

[Code]...

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Which Is Faster - A Using Block Or Try / Catch / Finally

Sep 2, 2010

This is a followup question to this Should I stick with the Try/Catch/Finally construct, or go with the Using construct? Sample Code for Try/Catch/Finally:

[Code]...

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Add A Block Of Xml Comment And Create A Try-catch To A Function?

Jul 7, 2011

We've created a little plugin to add a block of xml comment and create a try-catch to a function. (we simply add this to each and every function we write).But with the latest devexpress update I'm having a problem with the following code.[code].........

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C# - GridView SelectedIndexChange With Try Catch Block Faulty In 2.0?

Dec 14, 2009

I am using ASP.NET 2.0. When i place a TRY CATCH block in my event it always go into the CATCH section, in my case it re-direct the page to Default.aspx. But if I remove the TRY CATCH block the code get's executed fine and it does what it suppose to.

CODE:

There is no error message when i place a break point by the "Catch ex As Exception" Am I reading the selectedRowIndex DataKey value incorrectly maybe?

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Change The Auto-fill On Try Catch Block In .net?

May 1, 2011

In visual studio when I type the word try it automatically adds the catch and and try for me.

I want to add after the catch something like Msgbox(ex.message)... I'm tired to type the same thing over and over.

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MDI Global Error Handling - Nothing In Try Catch Block

Nov 21, 2008

I normally use the following for global error handling:
Code:
Dim currentDomain As AppDomain = AppDomain.CurrentDomain
AddHandler currentDomain.UnhandledException, AddressOf MYExceptionHandler
AddHandler Application.ThreadException, AddressOf MYThreadHandler
I normally don't have a MDI application, and When I force an error, neither of the events get fired. I don't have anything in a try catch block. How do I do this with a MDI application?

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Null Reference Exception In Catch Block

Oct 18, 2011

I'm trying to catch an invalid entry in a textbox that I use to enter numbers using the subroutine below.

In the Catch blok I want to change the ForeColor of the textbox that contains the invalid entry.

This did function but now gives me a null reference exception on the line where I change the ForeColor.

Private Sub SaveParm()
Dim Temps(2, 2) As Double
Dim Cname As String = "Text0"

[Code]......

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Try-Catch Block Not Allowing Negative Numbers?

Sep 24, 2009

I have a program in which users are entering numbers into text boxes. I'm checking for proper data entry using a TRY-CATCH block. It works great and delivers an error message if the users enter anything non-numeric.

The problem is that now I need the users to enter negative values, but the TRY-CATCH is seeing the negative sign as non-numeric.

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Unhandled Exception Message Happens Even In A Try/Catch Block?

Apr 25, 2011

This is part of my block which handles incoming messages via TCP. Sometimes it sends scrambled messages which are unpredictable and i need a Try + Catch block for it:'

[Code]...

I can either get "Input string not in correct format" or "typecast not valid". But this is simply supposed to be routine to run into and be able to handle. but that stupid error message keeps popping up I've heard of JITDebugging, should I use that?

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Closing A Form On The Load Event In A Try Catch Block?

Dec 12, 2009

okay i have this code

Private Sub Form_OpenGradeBook_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load

[code].....

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Generically Implement Exception Logging If I Have Already Got Many Try-catch Block?

Apr 20, 2012

I am writing ASP.Net Web-form in VB.

I have a system which have already handled exceptions by try-catch blocks everywhere.How do I quickly and generically implement exception logging like overriding something instead of inserting logging functions in every single catch block?

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Catch Block In Text.vb And Display The Results In Default.aspx?

Feb 26, 2010

Catch block in text.vb and display the results in default.aspx

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How To Catch Return Hit (enter) On TextBox

Jun 13, 2012

How to catch return hit (enter) on TextBox?The following does not work. I am keep getting error "KeyPress event can't be found".[code]

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Return Inside Try/catch/Finally?

Sep 15, 2009

I have a (begginner) question on VB.NET. Is this good code (I mean, is it "bullet proof")?. It seems to work, but I understand the Return is executed AFTER the Finally. So how does it call a method on an allready disposed of object?

[Code]...

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Show The Line Number Of The Line Of Code That Caused An Exception Within A Try...Catch Block?

Jan 29, 2009

Is there a way to show the line number of the line of code that caused an exception within a Try...Catch block?

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Thrown Custom Exception Is Immediately Caught In The Same Catch Block It Is Thrown From?

May 13, 2012

This may be a debugger issue, but here goes:I have this piece of code:

Private Function Connect() As Boolean
Try
sessionBegun = False[code].....

My intention is to 'convert' the low level exception into something more meaningful, so I throw an exception of my own creation. I want this to bubble up to a place where I can handle it.However what is happening is my debugger breaks and tells me that an exception of type "QuickBooksConnectionException" was thrown.I know that, I just threw it, why are you catching it? From what I've read, this ought to work, and there doesn't appear to be an analogous Java throws keyword, so perhaps it is my debugger.

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"On Error Resume Next" In Catch Block

May 26, 2009

I'm converting a VB6 project to VB.net.

I'm reading a dataset, if there are any issues with data, I log those errors to a table, but I need to continue reading the dataset with next record.

I am familiar with try/catch/finally for error handling. I'm reading the dataset in the try block, log the error in the 'catch' block. Now my question is - how do I continue with the loop again, since 'On Error Resume Next' statement is not supported in catch block VB.Net?

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Try...Catch Block "pauses" While Debugging?

Feb 8, 2010

I have a database application with error handling in a separate module.

[Code]...

But while debugging (and "Address" field is left empty), the program breaks and I get an exception at the "Throw New Exception" line even if the error should be trapped by the "Try...Catch" block.
At runtime, everything works well and the correct error is displayed.

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Exceptions - Can The "Throw" Statement Exist In A Block With No Try/catch Statement

Oct 5, 2009

how 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?

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Error - Catch Cannot Catch Type 'Microsoft.Office.Interop.Outlook.Exception'

Mar 25, 2011

I have a program in VB.Net that receives mails from Outlook, extracts attachments and inserts the attachments into a table through a query. I would like to put the query/queries in a Try/Catch block, but cannot do so as Outlook exceptions cannot be caught, and it gives me an error, and unless I put a very specific exception, I cannot catch it. Is there a workaround?

Edit:

Try
Catch ex As Exception
End Try

Exception is underlined and when I hover on it, it says: "Catch cannot catch type 'Microsoft.Office.Interop.Outlook.Exception' because it is not in 'System.Exception' or a class that inherits from 'System.Exception'". This is affecting all my other code which I'd like to put into a Try/Catch block.

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Restructure Try / Catch To Eliminate Error On Myreader.close Command In Catch Part?

Jun 19, 2012

The following code causes a "Warning" that Variable is used before value assigned.How do I restructure this Try/catch to eliminate error on the myreader.close command in the Catch part? Code appears to work fine but I dont like Warnings. [code]

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Button_click Event Will Not Stop Execute After Error Catch Using Try - Catch Statement

Apr 1, 2011

i have problem when i click a ADD button, there is one null value in the textbox .. so the try catch statemnt is to catch that null value error but after that the catch is success but the button click never stop excute the statemnt till the end of the button event.

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Nested Try...Catches - If An Exception Occurs In The 2nd Sub's Try...Catch, Which Catch Gets Excecuted?

Mar 4, 2009

I have this scenario: in a Sub I have a Try...Catch statement.Within that Try..Catch I call another sub.In that 2nd sub is also a Try...Catch.(see below for example).Now if an exception occurs in the 2nd sub's Try...Catch, which Catch gets excecuted? The 2nd one, the 1st one or both?

Private Sub sub1()
Try
..do stuff[code].....

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If Throw An Exception From Within A Catch, Does The Finally (from The Catch) Still Execute

Jun 2, 2009

If I throw an exception from within a catch, does the finally (from the catch) still execute? i.e.

Try
..some code with an exception in it...
catch ex as Exception
throw new SpecialException("blah blah" & ex.Message, ex)

[code]....

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Catch Log4net Exceptions / Use Try / Catch Approach

Jan 23, 2012

I need to catch log4net exceptions (its own exceptions not app exceptions logged by it). I wish there's a way of doing it this way: [code] I have this code implemented and there's no errors in compilation but i force log4net to have an error (pointing to a non existing database in the config file) and nothing is threw.I've tried the listener aproach: [code] and it's writing the errors to log4net.txt, the forced ones i mean.This last aproach has a couple of drawbacks: it won't append every error to the file, if the error is the same it doesn't write it, i can't get the listener to write every error to that file, only one (I don't know how to fully configure the trace listener, it might be that). Thus it won't append the date and hour to every line wich is a necesity for me. Finally i can't give structure to it (xml). Even if the listener work i need to use the try/catch aproach, since i'm using ExceptionHandling from Enterprise library to log the errors in my app.

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