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prevent catch

Posted By:      Posted Date: September 22, 2010    Points: 0   Category :ASP.Net

How can I prevent catch on my entire application?


How can I prevent catch on my entire application?

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Empty Catch in Global.asax to prevent exception from stopping a web application?



I'm using a static Timer in my Global.asax to run a method at regular intervals. When the method throws an exception, my application is stopped. I have used an empty catch to prevent exceptions from stopping the application something like below code. Is there a disadvantage to use such an approach?


 protected void Application_Start(object sender, EventArgs e)

 public class TimerStarter
            private static System.Threading.Timer threadingTimer;

            public static void StartTimer()
                if (null == threadingTimer)
                    threadingTimer = new System.Threading.Timer(new System.Threading.TimerCallback(CheckData),HttpContext.Current, 0, 50000);

            private static void CheckData(object sender)
                   // a method that reading xml file from another url              
                    // empty catch to prevent stopping the application




How to prevent uncommittable transaction and catch the error message when error occurs?


The situation is I have a daily batch job running SSIS package using the SQL Server Agent. In the daily batch job, the program will generate many dynamic SQL statements and put all SQL statements in a temp table #updateSQLTable. Then, use a cursor to loop through the temp table #updateSQLTable and execute the SQL statments.

The following is the code segment in the cursor:


begin tran t1

--start generating dynamic SQL statements


--after generating dynamic SQL statements

declare @updateSQL nvarchar(4000)

    FOR select updateSQL from #updateSQLTable where updateSQL is not null order by updateSQL
    OPEN mycursor
    FETCH NEXT FROM mycursor
    into @updateSQL

        BEGIN TRY
            --execute the generated dynamic Insert/Update SQL
            EXEC sp_executeSQL @updateSQL

        END TRY

SQL Server 2005 Try and Catch Exception Handling

I'm pretty excited to see that there is some real error handling for T-SQL code in SQL Server 2005. It's pretty painful to have your wonderfully architected .NET solution tainted by less-than-VBScript error handling for stored procedures in the database. The big difference being the addition of TRY..CATCH blocks. Let's take a look:

reader.getordinal("column_may_not_exist") how to catch the exception?



would any body please help me to catch the exception if the column doesnot exist as my table columns are not static.

sometimes its throwing me indexoutofrange exception as the column doesnot exist

thanks for the help guys

Debug Leaky Apps: Identify And Prevent Memory Leaks In Managed Code


When is the .NET Garbage Collector unable to reclaim memory? The answer might surprise you. Stay tuned.

James Kovacs

MSDN Magazine January 2007

Prevent loading big images ..



i need to prevent loading big images e.g max 100KB

but i only store url

1. user put url with image (i remember this string in database not image itself)

this cause that i can not check image size before store url in database

because user can store url and after this operation put bigger file at that location)

2. my web page generate some different image based on first image

and i need to load portion of image 

to stream and set buffer size to 100KB + 1 Byte

if stream is larger than 100KB that user put bigger file 

how can i accomplish that?

FileStream can not use URI as location only disc location

what should i use instead?

please help,

Karol Bieniaszewski

Prevent Concurrent Logins ? [ Already logged in or currest session is still active implementation] ?


Hi Experts ,

I searched over the web but no luck so far and thought of getting some help form gurus .

Did any out really implemented a way to handle concurrent logins ?

Please not that i'm no using either forms authentication or Roles/Memberships , I do have custom authentication for my website .

I'm sure it is someway related  with global.asax file handling something in application events and session events but unable to figure this one out .

Any pointers will highly be valued and appreciated .

Thanks a tonne in advance .

How to CATCH "Invalid postback or callback argument" exception?



How can I catch this exception? I do not want it to stop my page execution. Can/Should I do that?

Server Error in '/' Application.
Invalid postback or callback argument.  Event validation is enabled using <pages enableEventValidation="true"/> in configuration or <%@ Page EnableEventValidation="true" %> in a page.  For security purposes, this feature verifies that arguments to postback or callback events originate from the server control that originally rendered them.  If the data is valid and expected, use the ClientScriptManager.RegisterForEventValidation method in order to register the postback or callback data for validation.
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.ArgumentException: Invalid postback or callback argument.  Event validation is enabled using <pages enableEventValidation="true"/> in configuration or <%@ Page EnableEventValidation="true" %> in a page.  For security purposes, this feature verifies that arguments to postback or callback events originate from the server control that originally

how to write a stored proc to prevent multiple users in uploading the reports at a time? plsss help



I wanted to know how to prevent more than one user from uploading the report at a time .I am new to .net ,plss help with the code that would be great.Details are below:

This is a Windos based app written in c# . When User A  clicks Upload option on  one server  from the menu  to upload the files  and at the same time when User B clicks Upload option on different server , User B should be alerted a message saying "User A's uploading is in progress,pls wait" . How to achieve this, plsss help with the code.. I am thinking this logic should be kept in a stored proc, How do I write that proc? plss help


Thanks in advance!

How do I prevent displaying membership of an AD group in Colleague Tracker web part?


I'm a big fan of the Colleague Tracker web part in MOSS 2007 My Sites, especially the option to show 'Membership Changes'. This is often useful in highlighting that a colleague has been added to a certain AD group.

We now want to hide the membership of certain AD groups from the colleague tracker. For example, if an AD group called 'Project X' is created, we don't want membership of the group broadcast throughout the My Sites where colleagues are tracking colleagues.

My first thought was that we could use AD to 'deny read' on the 'Project X' AD group to all SharePoint related service accounts. This does not appear to have worked, although perhaps the configuration is more complex? The best approach would seem to be to prevent the group membership data ever being imported from AD to the SSP, hence my 'deny read' approach.

Has anyone successfully implemented this, or does anyone have any better ideas?


Using the BDC API how to catch the returned code when executing a stored procedure?

using BDC API, how can i catch the return code a stored procedure returns?

I tried Entity.Execute to execute a generic method. However, it returns an empty Entity table.

I know you can do it by setting up an output variable. I prefer returning an integer for tracking errors.

Any ideas?



How to detect and prevent new browser instance


Hi Folks,

I have a problem w/ a web app which is probably fairly common, but I cannot find any solutions anywhere. Hopefully someone will have an idea.

The web app in question provides a UI for editing a client (in the business sense, not the browser sense), identified by a ClientID.  I store the ClientID in Session, which gets passed from page to page, along with a number of other pieces of data in Session.  Works great.

The problem is that if the user opens a new browser window using Ctrl N or File->New Window (in IE), the new window comes up with the same page as the current page, with the same session info. Then if the user navigates to a different client in the 2nd window, the ClientID in session refers to the new client. If they go back to the original browser window and save, the original client gets saved using the 2nd ClientID, and all hell breaks loose, because now the data from the two jobs are intertwined.

I have enabled trace and verified that the new browser window uses the same SessionID as the original.  If an entirely new instance of IE is opened, it has a different SessionID, so is not a problem.  I have not yet investigated other browsers, such as Chrome or Firefox.

Is there any way to determine if a browser instance is opened for a web app which is already open in

Catch button click event in different .aspx page.


I have a button which starts processing.
I want that when ever a button is click from page1.aspx .. a count down timer should start and displayed on page2.aspx.
I am thinking of using iframe to join 2 pages.

Please let me know your suggestions.


Combobox SelectionChanged: Prevent firing for every keystroke?

Is it possible for this event to fire only when the user clicks an item from combobox with the mouse or when they hit enter on it like the old 2.0 combobox worked? I have tried messing aroudn with the new selectionchanged event but I cannot figure it out. I looked on the forums here for help but only found someone returning the even to fire only when items they type are in the combobox. Thanks all help appreciated.GINtech Systems Owner

To prevent possible data loss before loading the designer, the following errors must be resolved: In

To prevent possible data loss before loading the designer, the following errors must be resolved: The class Form can be designed, but is not the first class in the file. Visual Studio requires that designers use the first class in the file. Move the class code so that it is the first class in the file and try loading the designer again. Instances of this error (1) 1. Hide Call Stack at System.ComponentModel.Design.Serialization.CodeDomDesignerLoader.EnsureDocument(IDesignerSerializationManager manager) at System.ComponentModel.Design.Serialization.CodeDomDesignerLoader.PerformLoad(IDesignerSerializationManager manager) at Microsoft.VisualStudio.Design.Serialization.CodeDom.VSCodeDomDesignerLoader.PerformLoad(IDesignerSerializationManager serializationManager) at System.ComponentModel.Design.Serialization.BasicDesignerLoader.BeginLoad(IDesignerLoaderHost host) Thanks! This post is from Matthew Cenance.

Add Release-Only try-catch to CLR languages

Deploying a software, it's a common practice to encapsulate top-most function calls and/or event handlers with general try-catch blocks to deliver an error description to the user instead of just having him/her see the software exiting unexpectedly when unexpected exceptions occur. Unfortunately, during debugging it is most annoying to reach these log entries or message boxes instead of having Visual Studio halt where the exception occured. At the time of writing it is possible to designate particular exception types to halt the debugger when they are actually thrown. But it becomes a nuisance when there are many exception types to be marked this way. Plus, it becomes contra-productive if there is a scenario when expected exceptions of the marked types occur regularly and "Continue" has to be selected again and again in the debugger. Thus, I'd like to suggest to add a new, Microsoft specific, "try" keyword to all of the CLR languages (plus C++), perhaps something like "__try". This new kind of try should create a try-catch block only when compiling in Release mode. (This behaviour might apply to other configurations as well. I suppose the Configuration Settings dialog to provide an additional checkbox column to provide an option to select whether a particular configuration will create a try-catch block or not.)   See here for
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