Watertight Exception Catching?
May 5, 2010
Take the following code...
[Code]....
The aim here is to throw an 'AfterInitException' if there's an exception after Init has finished. My concern is that some low level error might result in an exception being thrown when, say, setting up the call to DoStuff and before the try/catch block within DoStuff has been set up. So an 'AfterInitException' would not be thrown even though the exception was thrown after Init!This might help...
[Code]....
...but then this is more messy and perhaps there could still be a low level exception which arises in clearing up the call to Init or setting up the try/catch block that follows it!
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Similar Messages:
Mar 14, 2011
I am trying to catch an exception but occasionally get an inner exception. I want to output both into a label. I often get Object reference not set to instance of an object if there is no inner exception.
Catch ex As Exception
exError = ex.Message.ToString
If Not ex.InnerException.Message Is Nothing Then
exError &= "<br/>" & ex.InnerException.Message.ToString
End If
Return View()
End Try
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Feb 18, 2011
i have a problem where i have an exception being thrown that i am capturing in global asax. As part of this exception handling i redirect the user to a specific page because of this exception.
i also have ELMAH error handling with the email module plugged in. I do not want to receive emails for this exception. I also don't want to add this type of exception to ELMAHs ignore list, in case i want to do granular work around the exception (ie, only if it matches certain properties, happens on certain pages)
i want to:
write an Application_OnError that redirects a user to a page (i know how to do this part, more for procedure i've left it here) In the Application_OnError stop ELMAH fromrecieving this error after i've caught it
i am currently calling Server.ClearError() inside my App_OnError method, but am still receiving these emails....
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Oct 1, 2010
I have a classical asp.net web service (asmx) and a web method in it. I need to throw a custom exception for some case in my web method, and I need to catch that specific custom exception where I call the web service method.
[Code]....
However, I cannot do that because when I add the web service reference on the client, I have service class, input and output classes, but I do not have custom exception class.
Also another problem is that, I have also problems with serializing Exception class (because of Exception.Data property implements IDictionary interface)
Is there a way to do this in my way, or am I in a completely wrong way, or is there something I miss about fundamentals of web services?
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Feb 22, 2011
I have a simple button ADD
And ADD_Click code is:
protected void Add_Click(object sender, EventArgs e)
{
string strConnectionString = ConfigurationManager.ConnectionStrings["SqlServerCstr"].ConnectionString;
SqlConnection myConnection = new SqlConnection(strConnectionString);
myConnection.Open();
string hesap = Label1.Text;
string musteriadi = DropDownList1.SelectedItem.Value;
string avukat = DropDownList2.SelectedItem.Value;
SqlCommand cmd = new SqlCommand("INSERT INTO AVUKAT VALUES (@MUSTERI, @AVUKAT, @HESAP)", myConnection);
cmd.Parameters.AddWithValue("@HESAP", hesap);
cmd.Parameters.AddWithValue("@MUSTERI", musteriadi);
cmd.Parameters.AddWithValue("@AVUKAT", avukat);
cmd.Connection = myConnection;
SqlDataReader dr = cmd.ExecuteReader(System.Data.CommandBehavior.CloseConnection);
Response.Redirect(Request.Url.ToString());
myConnection.Close();
}
What i want is, if anybody adding a data with same HESAP (primary key) i want a alert() function with this words. "Already there is a same data" or any words. Doesn't matter.
How can i do that?
NOTE: I want just the same HESAP value getting and catching an error.
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Aug 5, 2010
I have the following code
[code]....
and while that presents a friendlier error message to a user, I've forgotten how to show me the "real" error.
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May 13, 2010
The situation is I have two xslt files: one is called from my ASP.NET code, and there, the second xslt file is imported.What I'd like to accomplish is to pass a parameter to the first one so the second xslt(the one that is imported at the first xslt) can read it.
My c# code looks like this:
var oArgs = new XsltArgumentList();
oArgs.AddParam("fbLikeFeatureName", "", "Facebook_Like_Button");
ltlContentBody.Text = xmlUtil.TransformXML(oXmlDoc, Server.MapPath(eSpaceId + "/styles/ExploringXSLT/ExploreContentObjects.xslt"), true);
And I'm catching the param at the first xslt this way: <xsl:param name="fbLikeFeatureName" />
And then, passing it to the second xslt like this(previously, I import that file):
<xsl:call-template name="Articles">
<xsl:with-param name="fbLikeFeatureName"></xsl:with-param>
</xsl:call-template>
Finally, I'm catching the param on the second xslt file as following: <xsl:value-of select="$fbLikeButtonName"/>
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Mar 10, 2010
Using VS2008 SP1, .NET 3.5 SP1, C# Web Application Project
As we know, Web Application Projects (unlike Web Site Projects) compile the entire site for deployment. We have discovered a situation where the visual studio compiler doesnt catch and error. Then when we deploy the dll to the website (or even just run it in the built in web server) it catches the error and displays it as a "compilation" error during runtime. This is obviously disturbing. Let me explain the error:
Take a single web page in a new C# web app project, such as the default.aspx. Add a checkbox. Create an event handler for the checked changed event. Note that it modifies the .aspx file to add oncheckedchanged="yourmethodhere" in the checkbox item. Compile and everything is fine.
Now change the name of the method in the .aspx file, say for yourmethodhere to yourmethodhere_1 and compile again. Note you havent change the code behind, so you SHOULD get a compile error. But you dont. Now if you deploy or debug it, you will get a compilation error during runtime.
Note: If you do exactly the same thing in a web SITE project, the validation compile that it does when you choose to "build" the project DOES catch this error. In other words, only c# web APPLICATION projects have this problem.
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Aug 28, 2010
Thisis the code I use to display an aspxloadingpanel with an ms update panel:
var prm = Sys.WebForms.PageRequestManager.getInstance();
prm.add_initializeRequest(initializeRequest);
prm.add_pageLoaded(pageLoaded);[code]....
However when an error occurs on this page, the loading panel continuously remains on the screen...How can I catch errors so that instead it would actually show the error.
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Jan 23, 2011
I have a website that serves all its pages using a single 404 page. it displays hotel profiles form business and depending on different profile levels offers more or less functionality and information.
Through the DB a masterpage is selected and usercontrols are applyed to that.
I have a contact page like this : 404.aspx > masterpage.Master > contact.ascx
My form action looks like this default.aspx?404%3bhttp%3a%2f%2fwww1.testsite.co.uk%3a80%2fcontactus
and when I click the button this where I send up with an error "Validation of viewstate MAC failed" error.
I have read stuff on these for 4 hours but still have no idea where to start.
Do I need to
Catch the form action URL (postback URL) in the baseclass and change it back to [URL] - If I do this are the form firled values still intact
Do i need to do something to change the form.action url before the page is built, if so is this done in the masterpage preinit event as this is what the form tag is
What I know works is that the usercontrol is aware of the postback, but not the form values.
I want to be able to add a 404 based contact us form on any one of 1000s of profiles and be able to catch the values. Idearly I would like to do this in the codebehind of the usercontrol as this keeps the code seperate
I am sure this must be possible and normally I can work stuff out, but here I am totally stuck. I am trying to do this in VB.
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Dec 19, 2011
I have some code that is throwing unhandled DivideByZero exceptions in a WebMethod. These exceptions are not being caught by the global logging in Application_Error in global.asax. why exceptions thrown from a WebMethod are not handled by Application_Error?
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Feb 12, 2010
Imagine a web service with a method that returns a Customer object, that takes a customer ID as a parameter, i.e.
[WebMethod]
Customer GetCustomer(string customerId)
Now imagine that you're writing an ASP.NET app and you've generated a proxy for the service with the async operations. You create an instance of the service, wire service.GetCustomerCompleted to your handler, OnGetCustomerCompleted, and call service.GetCustomerAsync("12345"). In OnGetCustomerCompleted you apply logic to detect that no customer was found and throw a custom exception, or you want to throw the exception found in e.Error, e.g.:
void OnGetCustomerCompleted(object sender, GetCustomerCompletedEventArgs e)
{
if (e.Error != null)
throw new ApplicationException("GetCustomer failed", e.Error);
if (String.IsNullOrEmpty(e.Result.FirstName) && String.IsNullOrEmpty(e.Result.LastName))
throw new CustomerNotFoundException();
}
(I've omitted the bits of code that sets up a Customer object and persists it through the calls.) You launch the call to GetCustomerAsync in Page_Load and expect to retrieve the result in a handler wired to Page.OnPreRenderComplete. My question is, how do you catch the exception in your page? I know you can catch it with Global.asax's ApplicationError, but what if you don't want to navigate away from your page?
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Feb 5, 2010
I have a repeater control and in its footer temlate is a button (or 2 in the example) and I want to catch its click event but seem to not be able to.
I tried in the repeater itemcommand event and also I tried defining a subprocedure for the 'occlick' event but neither works..
[code]...
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Jan 1, 2010
i need to restore Database.mdf; I create a blank new database exactly the same name as the .mdf file. However, I could not restore the database.
The error message prompted was:
TITLE: Microsoft SQL Server Management Studio Express
An exception occurred while executing a Transact-SQL statement or batch.
(Microsoft.SqlServer.Express.ConnectionInfo)
ADDITIONAL INFORMATION:
Cannot open backup device 'C:inetpubwwwrootTCPSystemApp_DataDatabase.mdf'. Operating system error 32(error not found).
RESTORE HEADERONLY is terminating abnormally. (Microsoft SQL Server, Error: 3201)
click: [URL]
BUTTONS:
OK
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Aug 3, 2010
I am working on a 3-tier asp.net application. Currently I'm stuck up in a situation where I need to handle a specific type of exception (User Defined) in DAL and Show alert to the user if that exception occurs in DAL.
I tried following things:
1) I raised that exception from the DAL and catch it in BLL and throw a new BLL exception to for that DAL exception and finally catch it in the UI layer to show the alert to the user. I've successfully implement this in my project. But there are some issues in this approach. First of all I feel this is not right way to do this as it may lead to performance related issues. Secondly, the application contains more than 500 pages and classes. so I need to attach additional catch block in every method to catch the BLL exception. which is the last option i'd like to take.
2) in second approach I logged the the DAL exception into a text file. but problem in this approach is that how could the UI layer know that exception has occurred and show the alert to the user. Is there any event in asp.net where i could handle all this activities?
my question is what is the best approach to handle this type of situation? Will Exception handling block help me in this?
I've tried reading many articles on this but i couldn't get an answer for my question? I might not be using right keywords for my search.
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Feb 4, 2010
In ASP.NET,How can i know the Specific details about an exception (like What kind of Exception it is (FileNotFound /Arithmentc etc..) )from a General Exception class object.
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Jul 2, 2010
i have this application structure:
1. Presentation Layer which calls
2. Business Logic Layer which in turn calls
3. Data Access Layer to do the dealing with the database.
Now i have a Contacts page from where i can add a new contact to the database.So to add a New Contact i fill in all the required details and then call a Add Method (residing in the BLL) from the page, which in turn call a Add Method residing in the DAL.this method in the DAL returns the Current Identity of the record which is then return back to the BLL method and finally delivered on the page.this is fine. but what if a get an exception how do i handle it properly because the method in DAL has a return type of int and i dont want to throw another error!! coz other wise i will have to write try catch in almost all the methods.
//something like this
public int AddMethod(ContactClass contactObj)
{
int result = 0;[code]...
rather i want to show the user a user-friendly message which they can easily understand and in the mean while i will send a mail to myself documenting the Error that just occurred.how can i implement my custom exception classes.
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May 18, 2010
Is there any way to uniquely identify a particular exception from the general exception class.
i.e any property or method that retrieves a unique identifier that to identify a particular exception.
I have kept some error values and corresponding error texts in an xml file. I want to read that xml file and have to taken the error ids and fix the corresponding texts to a label. in the case of a system exception we have to identify a particular exception.
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Jul 18, 2010
Difference between Exception and Fault Exception..?
Can i use Fault Exception when i get the Exception.
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Jul 12, 2010
We're getting this InternalSubStringWithChecks exception with our application's healthMonitoring. This exception is like the Padding is invalid and cannot be removed exception where it's being recorded and we're getting a notification email but the end user is unaware that an actual error has happened. Though we don't want our event log filled up with this rubbish! The stack trace is:
Parameter name: length
at System.String.InternalSubStringWithChecks(Int32 startIndex, Int32 length, Boolean fAlwaysCopy)
at System.Web.Handlers.AssemblyResourceLoader.System.Web.IHttpHandler.ProcessRequest
[code]...
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Feb 3, 2010
I have a aspx page with a ascx control inside an ascx control and the required field validator is not hit on the action of the page.
The issue is with the 2nd nested ascx control. The field validators in the first ascx control validate correctly, but with the ascx control inside the ascx control there are issues.
The nested ascx control is a repeater control and this may be the reason, but I am unsure.
I'm not exactly sure what question to ask, but I'll list a few below.
How do I attach the field validators up a level to the 1st ascx control?
Is it possible to put required fields into a nested ascx control?
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Aug 17, 2010
I have simple 3 tier web application and have mostly CRUDE functionalities. Recently I required to add new console application to the existing solution in which I call data layer methods for retrieving data from DB but I get an exception "The type initializer for threw an exception."When I debugged I found that the exception is thrown at datalayer on first line of class where I get connectionstring from
web.config, the code is public static readonly string CONNECT_STRING =
ConfigurationManager.ConnectionStrings["DbConnectString"].ConnectionString;
Now if I hardcode the connection string value like public static readonly string CONNECT_STRING = "Data Source=XYZ;uid=sa;password=XXX;initial catalog=ABC;"
it works fine.I don't understand what is the issue here as web application works fine with this datalayer.
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Mar 1, 2011
To make divs clickable I use this:
$(".clickable").click(function (event) {
window.location = $(this).find('a').attr('href');
event.preventDefault();
});
I'm using an <asp:Repeater> in asp.NET to create several such <div>s.The problem is that all clicks in the div are picked up by this jQuery - I also have an <asp:Button> inside the div, for this I want to catch the click as normal and process it in the repeater_ItemCommand event - But this doesn't fire - the page just redirects to the href found in the hyperlink in the div.
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Dec 13, 2010
I insert this block of html/css/jquery into my page - in Safari and FireFox it works fine, but in IE 7/8 at about the 8th block of this the Style and some Jquery fx doesnt seem to catch; it is exactly the same as my other code, no mods in the ones that arent catching. It is just inserted in a column in my table on my page, actually the literal is there in the column, my literal.Text outputs blocks of:
[Code]....
Specifically the Style of
[Code]....
[Code]....
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Apr 21, 2010
I am LINQ querrying against a datatable. However, I am unsuccessfull with catching null values. Here is my code that is giving me the following error.
[Code]....
I am checking to see if minperc is null. However to check that it still is trying to convert the value to double. Cant figure out a way around it. Here is the error: Cannot cast DBNull.Value to type 'System.Double'. Please use a nullable type.
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