For example, I am using wenclient.DownloadfileAsync to download a file asynchronously.
In the DownloadFileCompleted event handler, I can check if I have any exception or not by using AsyncCompletedEventArgs.Error property.
If I re-throw this exception, however my executable is stopping running immediately.
I am wondering how to handle this kind of exeception? How to pass this exception back to the
calling thread?
i'm using asp.net 2.0 form with ajax. i have an ihhtpmodule which can thrown an exception at Application_EndRequest step. my problem is that if this happen in an async postback (i mean a postback of an update panel) i can't manage the exception (with manage i mean set a custom error message server-side) becouse it's too late for the error handler of the ScriptManager.
(the alert will print a message as:
Sys.WebForms.PageRequestManagerParserErrorException: The message received from the server could not be parsed. Common causes for this error are when the response is modified by calls to Response.Write(), response filters, HttpModules, or server trace is enabled.
Details: Error parsing near 'MyButt" />
|<html>
<head>)
at the moment my idea is to clear the response in the module and find a way to use the scriptmanager to send the correctly response of an error/exception. it's this possible? or samebody has another option of how to manage this case? note:i can't edit the aspx to manage this client client side with custom javascript
We have an ASP.NET page which uses an update panel for partial page postbacks. On the server side, the postback performs some database work and updates several UI elements. The database code is all contained in several transactions, so the state will still be consistent if an exception is thrown. We're working on some error handling code now, and my first thought was to log the exception thrown, reload the last consistent UI state, and show some sort of modal popup or other ui element with a brief error message for the user (this is an intranet page, so we're automatically notified of the bug, and the users know where to find us.
View 1 RepliesI devide my website on 3 layers :
DAL(Data Access) - simple extract data from DB using LINQ
BLL(Business Logic) -
cache data and in try/catch block call function from DAL and throw it to UI :
try
{
}
catch (Exception ex)
{
//Log error
throw ex
}
UI (User Interface) - simple working without handling any exception,
So if error occured in BLL i will be redirected to Error.aspx page with message that something wrong.
how and where handle exceptions, or may be exists common patter where handle and how to inform user about errors ? Can anybody share bes practice.
I have this sample code for async operations (copied from the interwebs)
[Code]....
Other async approaches I tried required the aysnc page attribute, they also seemed to cancel if other page elements where actioned on (a button clicked), this approach just seemed to work.
I'd like to add a cancel ability and exception handling for the longRunningTask class, but don't erm, really know how.
I have a simple web page in ASP.NET / C#. Currently to fully render the data I require calling a block of code that runs on background threads and can take multiple minutes to complete. I've got it to the point (using the async attribute on the page declaration) to execute and return fine with the html once it's done. What I'd like it to do is allow me to return immediately with a 'loading page' of some sort and then have that page be updated when the background work has been completed. Right now I get nothing on the page while the background work is being processed.
View 3 RepliesI want to make an async call to the server when an achor tag is clicked and then have the browser advance to the href without waiting for the async call to return a result. I am using System.Web.UI.ICallbackEventHandler. My server code is not executing. The server code only executes if the GetCallbackEventReference call specifies a clientscript value which means the page has to wait before advancing. What am i doing wrong?
My client code is:
<script type="text/javascript">
function ReceiveServerData(arg, context) {
}
function DoAsyncTask(arg)
{
CallServer(arg, '');
return false;
}
</script>
Since data saving is a time consuming, I would like to call data saving method using Ajax and that too Async what i mean is as soon as the user click submit button it just display the confirmation page and data saving bit keeps going on in the background.
Is this possible using Ajax tool kit?
My javascript code is calling a asp.net webservice, so i have a call to the webservice something like this:MyWebservice.GetData(param, ResponseReceived, ResponseTimeOut, ResponseError);When the webservice returns data, ResponseReceived method is called.However sometimes the user might navigate to another url before the webservice call actually returns, in such a scenario FireFox throws an Error saying 'An error occured oricessubg the request. The server method GetData failed'So my question is how can i kill the async call when the user navigates to another page or makes another request to the webservice? I know in a normal XMLHttpRequest i could have called Abort method, but not sure how to make it work with the above webservice proxy.
View 2 RepliesIn our application we have a scenario where we need to display a panel using modalpopupextender after performing an async call on the server. We were using the Show method for displaying the popup. It used to work fine without any async call. But when an async call was introduced during the request processing the popup is not getting displayed.
View 7 RepliesHow do force full page rendering in async call process?
[Code]....
how to handle the Exception
View 9 RepliesHow can I coerce an exception message that has bubbled from my business layer into an alert box in javascript?BTW, I'm using ASP.NET MVC 1.0.
View 1 RepliesI have a asp.net 2.0 application connecting to a SQL database. Sometimes while browsing through the application, we stumble across the OutOfMemory Exception. I am currently using VS 2005. What is the best way to tackle this exception. Maybe something like a memory profiler...or something like that.
View 4 RepliesI've written a custom FilterAttribute that implements IExceptionFilter. But this only catches exceptions in the controller actions. What is the best way to handle exceptions in views and html helper methods on a Windows 2008 64-bit Server running IIS 7
View 4 Repliesi got this exception when i done the code given below..
"Unable to evaluate expression because the code is optimized or a native frame is on top of the call stack."
--code--
try
{
if (retVal == 0)
Response.Redirect("Success.aspx");
}
catch(Exception error)
{
Response.Redirect("errorpage.aspx");
}
finally{
}
from searching in net i found it to be a bug and if its success then we should end response... ie " Response.Redirect("Success.aspx", false); ".it works fine.. is this a good method or there is any other efficient method to handle this exception
I have a textbox that invokes a function on text changed. When the function encounters exception, I want to throw the exception back to the caller. But the problem is the caller is from .aspx file, not .cs file. How can the caller handle the exception?
[Code]....
[Code]....
I am using Session variable throughout in my application and my timeout is 1 hour. Here I need to catch the exception for session expires in any global way across my application.
View 3 RepliesIn my code i am running an exe file through a process call. How to handle exception generated by the exe file.
View 1 RepliesI am converting the entered values in textbox into decimal values to saev in sql table. In case user does not enter any value i get a Format exception. How do i handle this..
My code is as below
DMLObj.Add("ItemID", Convert.ToInt32(drpitemname.SelectedValue).ToString());
DMLObj.Add("SupplierName", Convert.ToInt32(drpvendor.SelectedValue).ToString());
DMLObj.Add("Quantity", Convert.ToDecimal(txtqty.Text).ToString());//qty.ToString());
DMLObj.Add("Unit", Convert.ToInt32(drpunit.SelectedValue).ToString());
[Code] ....
My web application some times gives error 'The handle is invalid. (Exception from HRESULT: 0x80070006 (E_HANDLE))' on server. I never comes on production server. Then I just upload the bin folder again on server and it starts running fine. I don't know what is the actual reason behind this.
Some experts suggested Min pool size =1, I applied that but no luck.
I have attached error image.
string connectionstring = WebConfigurationManager.ConnectionStrings["AdventureWorks"].ConnectionString;
SqlConnection con = new SqlConnection(connectionstring);
DataSet ds = new DataSet();
DataRelation dr = new DataRelation("show", ds.Tables["HumanResources.Employee"].Columns["EmployeeID"], ds.Tables["HumanResources.EmployeeAddress"].Columns["EmployeeID"],false);
ds.Relations.Add(dr);
foreach (DataRow row1 in ds.Tables["HumanResources.Employee"].Rows)
{
Response.Write("customertitle:" + row1["Title"].ToString());
foreach (DataRow row2 in row1.GetChildRows(dr))
{
Response.Write("customer add" + row2["ModifiedDate"].ToString());
}
}
Object reference not set to an instance of an object. 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.NullReferenceException: Object reference not set to an instance of an object. Source Error:
[Code]....
Line 31: Line 32: DataSet ds = new DataSet();Line 33: DataRelation dr = new DataRelation("show", ds.Tables["HumanResources.Employee"].Columns["EmployeeID"], ds.Tables["HumanResources.EmployeeAddress"].Columns["EmployeeID"],false);Line 34: //ds.Tables["HumanResources.Employee"].ParentRelations.Add(dr);Line 35: ds.Relations.Add(dr);
Source File: d:databaseDataset showing selected
field of 2 tables.aspx.cs Line: 33
Stack Trace:
[Code]....
[NullReferenceException: Object reference not set to an instance of an object.] dataset__with_two_tables.Page_Load(Object sender, EventArgs e) in d:databaseDataset showing selected field of 2 tables.aspx.cs:33 System.Web.Util.CalliHelper.EventArgFunctionCaller(IntPtr fp, Object o, Object t, EventArgs e) +15 System.Web.Util.CalliEventHandlerDelegateProxy.Callback(Object sender, EventArgs e) +33 System.Web.UI.Control.OnLoad(EventArgs e) +99 System.Web.UI.Control.LoadRecursive() +47 System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +1436
I want handle exceptions in update panel control with c#.
View 1 RepliesMy web app is using a sliderextender to allow the user to change the distance. After the slider handle is moved and the mouse button is release, I would like to call a function to query the results and rebind my datalist.
How can this be done?
my slider control is:
[Code]....
Is there anyway I can handle both json and html return types when posting jquery ajax:
For example, this ajax call expects html
[code]....