.net - Try Catch Finally Blocks.. Do I Still Need Them When Handling Errors In The Global.asax

Jun 2, 2010

I am handling errors via my global.asax in this method:

Dim CurrentException As Exception
CurrentException = Server.GetLastError()
Dim LogFilePath As String = Server.MapPath("~/Error/" & DateTime.Now.ToString("dd-MM-yy.HH.mm") & ".txt")
Dim sw As System.IO.StreamWriter = New System.IO.StreamWriter(LogFilePath)

[code]....

In my code I currently have no other error handling. Should I still insert try, catch, finally blocks?

View 1 Replies

Try / Catch In Global.asax While Logging Errors To Db Needed?

Nov 3, 2010

So I handle all exceptions in my project within my Global.asax page. For example, on a random page I could have:[code]So my question is in the Application_Error method, do I need the try/catch block when trying to write to the database? I'm thinking I would in case something goes wrong with the connection, etc. - but is this really necessary? Also, what would I do in the catch block if there is an error? At that point I would be catching the error of logging an error which is confusing in its own right.

View 1 Replies

Handling Errors In Try/catch Blocks?

Jun 11, 2011

What is the convention in VB when a sub requires that a try/catch block succeed in order to function, but the catch block doesn't bubble the exception up?

I could put all of the code into the try block, but this seems messy since most of it doesn't need to be tried, it just needs the try to have succeeded.

For example, should the catch block exit the sub? This would work in my current situation, and if it is the proper procedure, let me know, but what about the more general scenario where both both success and failure require additional processing?

View 1 Replies

Use Global.asax To Catch Missing PDFs?

Sep 16, 2010

I'm trying to use the Global.asax file in the root application of the website to catch requests for pdf files in the root that don't exist any more. I've configured iis to send pdf requests to asp.net. The whole thing works perfectly on development. It also works on the live system with missing .aspx pages, but not .pdf. Instead an "Error Code 64: Host not available". I'm using the Global.asax file to avoid the web.config and child applications (1.1 & 2.0) inheriting settings.[code]...

View 1 Replies

General Exception Handling Without Global.asax File?

Mar 21, 2012

I was wondering if there was a way to catch all unhandled exceptions in a visual studio project. My project does not have any files named global or global.asax so I was wondering if there was some other way to catch any and all unhandled exceptions? So far I've tried to put exception handling around specific blocks of code, but it doesn't have any effect.

View 3 Replies

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?

View 2 Replies

C# - Use Case For Try-catch-finally With Both Catch And Finally

Feb 17, 2010

I understand how try-catch works and how try-finally works, but I find myself using those (usually) in two completely different scenarios:

try-finally (or using in C# and VB) is mostly used around some medium-sized code block that uses some resource that needs to be disposed properly.
try-catch is mostly used either

around a single statement that can fail in a very specific way or (as a catch-all) at a very high level of the application, usually directly below some user interface action.

In my experience, cases where a try-catch-finally would be appropriate, i.e., where the block in which I want to catch some particular exception is exactly the same block in which I use some disposable resource, are extremely rare. Yet, the language designers of C#, VB and Java seem to consider this to be a highly common scenario; the VB designers even think about adding catch to using.

Or am I just overly pedantic with my restrictive use of try-catch?

EDIT: To clarify: My code usually looks like this (functions unrolled for clarity):

Try
do something
Aquire Resource (e.g. get DB connection)
Try

[Code]....

which just seems to make much more sense than putting any of the two catches on the same level as finally just to avoid indentation.

View 10 Replies

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]....

View 6 Replies

Add This Code To Global.asax?

Dec 14, 2010

I need to add the code below to my global.asax file. It begins with a Sub Application_BeginRequest . My global.asax already has a section that begins with Protected Sub Application_BeginRequest(ByVal sender As Object, ByVal e As System.EventArgs) I'm assuming that I should not have two sections with Sub Application_BeginRequest I tried putting the core of the new code into my existing Sub Application_BeginRequest and it returns no errors but it when I try to view the website in VWDE 2010 it times out. Something is causing it to run or load slowly.

This is the code that I'm adding:

<script runat="server">
Sub Application_BeginRequest(ByVal sender As Object, ByVal e As EventArgs)
Dim url = String.Empty

[code]....

View 1 Replies

Using IHttpModule Over Global.asax?

Mar 4, 2009

I've been given the thrilling task of re-writing our exception handling system. Whilst I will state that handling exceptions from an application-wide point of view isn't something we want, typically it's unavoidable when our team are understaffed for the sheer amount of work we need to push out the door, so please, no flaming the globalised solution to exception handling here

View 3 Replies

Asp.net - Rewrite URLS Using Global.asax

Apr 2, 2012

I'm trying to make some friendlyurls in my vb.net (.net 4) project and I'm trying to do it using something I read about global.asax and Application_Beginrequest but I can't get it to compile.

[Code]...

View 2 Replies

Global.asax Code Not Firing?

Nov 9, 2008

i have a project with 1 main form, in form load i call 4 subs which call data from an api. I have added a splashscreen from the add form menu. The splashscreen displays first while the main form loads(calling api data)What i would to do is have a progress bar on the splashscreen with the progress of the mainform load.

Private Sub Form1_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
SplashScreen1.ProgressBar1.Value = 0
updategeneral()

[code].....

View 9 Replies

Maintain PageViews In Global.asax (asp.net)?

Mar 25, 2010

I need a function in global.asax file which gets called only once when user enter a page url. application_beginrequest gets called 50-60 times in a single page( as to render a page several requests go to server.)

i though of a solution - I can write my fucntion in global.asax and call it on page load of other pages but in that solution I need to call it in every page. I would prefer something which is to be done only in global.asax

View 2 Replies

Why Use Finally In Try/Catch

Nov 25, 2009

OK, I'd like to know the difference between the following two blocks of code:

Block A
Try
Something

[code].....

View 3 Replies

.net - Accessing A Public Class From Global.asax?

Aug 5, 2011

I would love to implement the asp.net routing but i have a basic question.

In my Generic handler i have the following Global class

Public Class MyHandlerRouteHandler : Implements IRouteHandler
Public Function GetHttpHandler(requestContext As System.Web.Routing.RequestContext) As System.Web.IHttpHandler Implements

[Code].....

View 1 Replies

C# :: Why Can't Write Just A Try With No Catch Or Finally

Dec 27, 2010

Sometimes I do this and I've seen others doing it too:

VB:
Try
DontWannaCatchIt()

[code].....

View 10 Replies

Access The Page Object In Global.asax In The PreRequestHandlerExecute

May 31, 2010

I have a huge website (containing around 5000+) pages. There is a theme functionality in the website where user can choose different colors for their profile. Now i want to use the ASP.net theme feature and put different CSS (for different colors) in the theme folder and in Global.asax i want check the user theme and render appropriate link element with the css. But my problem is, i am not able to access the Page element for adding the link in the page. Here is my code

Dim page As System.Web.UI.Page = TryCast(System.Web.HttpContext.Current.Handler,System.Web.UI.Page)
page.StyleSheetTheme = "Black"

But when i run this code I get a Null reference error.

P.s : My application is very huge so its not possible to have a master page or a base class and inherit it in every page.

View 2 Replies

Calling A Sub Procedure From Withing Global.asax Page

May 21, 2009

I have a Sub procedure (say: my_sub() ) in one of my aspx.vb (say: mypage.aspx.vb) pages and I want to call this Sub inside the Session_End event in the Global.asax page.

Somthing like this:

Sub Session_End(ByVal sender
As
Object,
ByVal e

[Code]....

View 3 Replies

Catch Exceptions In Finally Block?

Oct 13, 2010

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

View 2 Replies

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]...

View 7 Replies

Try Catch Finally Doesn't Work?

Mar 23, 2010

I've a class with a timer inside

Private tt As New System.Timers.Timer()
This timer is enabled in the New() of the class
Try

[code].....

View 10 Replies

VS 2008 How To Use Try Catch Finally Statement

Jun 15, 2009

i want to know how to use try catch finally statement.i want to catch this error Violation of PRIMARY KEY constraint 'XPKemployee'. Cannot insert duplicate key in object 'dbo.employee'.

View 4 Replies

VS 2008 How To Use Try..Catch...Finally Statement

Mar 4, 2011

i have this problem about the try,catch,finally statement... i don't know how to use it..i have my converter program here and this should be type by a letter 'cause if you do it will go lag or hang...i try VERIFY button to make sure if it's a letter or number but my teacher said it's not counted...

Public Class Form1
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
If ComboBox1.Text = "Pounds To Kilo" Then

[code]....

View 14 Replies

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]...

View 4 Replies

.net - Show Alert Message Box From The Global.asax (on Application_Error Event)

Apr 12, 2010

Normally I just redirect to a custom error page in on the Application_Error event, but I have a specific error for which I'd like to display an alert message while the user is still on the page which triggers the error. How can I make this happen?

I'm open to a modalpopup or any other type of error message, I just want to ensure the user stays on the page where they encounter the error.

This is in reference to this thread: [URL]

Here is the code I'm currently using:

Sub Application_Error(ByVal sender As Object, ByVal e As EventArgs)
'Code that runs when an unhandled error occurs
Try

[Code]....

View 2 Replies

Routing - MapPageRoute In Global.asax - Cannot Convert String To Long

Jun 7, 2011

I am having an issue where the I am trying to use some Regular Expression in a constraint. The issue is it is evaluating the Regex as a string, and throwing an error. "Cannot convert String 'd+' to long".

.MapPageRoute("Parts",
"{PartName}/{Part}/",
"~/Inventory/Default.aspx",
Nothing,
New RouteValueDictionary(New With
{.Part = "d+"}))

View 1 Replies

Show An Alert From Global.asax On A Page That's Experiencing A SQL Timeout?

Sep 17, 2009

In Global.asax, is there a way to handle SQL Timeouts elegantly, and display a message on the requesting page explaining the error? I know Global.asax has the Application_Error and Error events, but I'm not sure which (if any) I could use to accomplish this.

Related, can I access the page instance which raised the error that Global.asax is handling?

View 2 Replies

.net - Replicate Try/catch/finally Using On Error Goto

Jun 14, 2012

Suppose in VB.NET you have:

Try
Debug.Print("Trying...")
Catch ex as Exception
throw new Exception("Exception", ex)
Finally
Debug.Print("Finally...")
End Try

How would you write this using the "On Error Goto" construct? (please no questions asking why I would want to do this, just curious if it can be done).

View 2 Replies

Trap Any Exceptions With Try Catch Finally If The Reader?

Apr 8, 2011

I have a SqlDataReader and I want to trap any exceptions with Try Catch Finally if the reader =cmd.ExecuteReader() statement fails. If this statement throws an exception do I need to close the reader? If so, where. Wherever I place the reader.close() statement I get an error that the reader has not been assigned a value yet.