I'm developing a asp.net website, i having a problem in one page i using ModalPopupExtender to show a asp:Panel, this panel have a updatePanel with e FormView and nested ListView and ataPager when this was done the Microsoft.Ajax js file throw exception"element is null or non object" at Sys.UI.DomEvent.addHandler.
View 1 Replies
I have an ASP.NET page with code-behind in VB.NET. On the ASPX page I have a Repeater with an asp:ImageButton inside the repeater and I want to catch the clicks on the button. As far as I read I have to use FindControl and then handle the copy of the original control:
Codebehind:
Dim imagebutton1 As ImageButton = repeater.FindControl("btnImage1")
AddHandler imagebutton1.Command, AddressOf ReportTransfer
...
...
Protected Sub ReportTransfer(ByVal sender As ImageButton, ByVal args As CommandEventArgs)
...
End Sub
ASPX page:
<td>
<asp:ImageButton runat="server" ID="btnImage1" ImageUrl="~/images/icons/icon_small.png"
CommandArgument="3" />
</td>
</tr>
</ItemTemplate>
It throws "Object reference not set to an instance of an object" on the AddHandler line and I have no idea why it is doing it (I'm a bit new with VB.NET)
i have an ascx user control with jQuery in script tags to do some UI work in the .ready jquery function but i'm getting the Microsoft JScript runtime error: Object expected error and i'm not sure why. here's my code:
[Code]....
What is the point of throwing an exception? It it anyways going to be caught in the Global.asax Application_Error method.
Lets say in the following code we throw an exception.
try {
using (var dc = GetDataContext())
{
// We are doing some data inserts here.
}
catch ( Exception ex)
{
throw ex;
}
My Question: Even if we do not use try catch and throw here, any exception which will be raised here will be caught inside Application_Error method in Global.asax. Then what is the point of try, catch and throw in this case?
I have an asp.net application with separate classes for business logic and database interaction and then of course the UI. I am building a form to add a widget to a widget list table in the database. My UI collects the information and submits it to the business class. I'm going to write the business class to first double check that the widget has a name (I know I should do this in UI with validation, and I will, but this is just in case validation is forgotten) and if it does, go ahead and send the information to the database class. The database class will then attempt to write the info to the correct table using a try catch finally block. Any errors caught here are logged and then rethrown so I can inform the user. So, knowing that my database class may rethrow an error, my business class code will also be written in a try catch finally block.
So at this point I have a number of possible outcomes that I want to inform the user via the UI:
1) Everything was fine and the widget was added.
2) Something happened with the database write and the user should try again later.
3) The user forgot to name the widget.
My question is: should I write my UI in a try catch block and then throw a custom Exception with an Exception.Message in the business layer if anything goes wrong, or just have my business logic return a string that is the message? I'll want to know if the process was successful or not, because I'll want to format the actual message differently, so I'd have to use if...elseif to determine if the message was bad or not.
It seems like throwing a custom Exception in the business layer may be a good way to tell the UI something bad happened. If the UI doesn't catch anything then of course the operation was successful. Then again throwing an exception for missing data seems a bit hefty.
i have just noticed something strange in some asp.net markup.
I have a standard form with a couple of textboxes and a submit button.
When clicked the code behind will attempt to perform some logic and then return.
If the input values are not valid it used to throw an exception.
The moment i wrapped the controls in an AJAX update panel and try to submit bad data, no exception is thrown and the panel returns like nothing was wrong.
Does anyone know how to return this to the previous behavior whilst keeping the update panel?
I am using AjaxToolkit 4.0 which suggests to use ToolkitScriptManager in place of ScriptManager. But when I am using ToolkitScriptManager, it throws javascript exception when Page_ClientValidate() in called from javascript. However, this error is not coming when ScriptManager is used. Can anybody tell me how to make Page_ClientValidate() run when using ToolkitScriptManager?
View 1 RepliesThe send method of SMTP is always throwing an exception. The message is : Failure sending mail Here is my code:
MailMessage mm = new MailMessage();
mm.To.Add("Yuvraj.dhot@xxxxx.co.in");
mm.From = new MailAddress("Kumar.Chaudhari@xxxxx.co.in");
mm.Subject = "Ant Subject";
mm.Body = "Body Cha MEssag here ";
SmtpClient ss = new SmtpClient("localhost");
ss.EnableSsl = false;
try
{
**ss.Send(mm);**
Result.Text = "Message Sent";
Result.ForeColor = System.Drawing.Color.Green;
}
catch (SmtpException ex)
{
Result.Text = "Message Not Sent :
" + ex.Message;
Result.ForeColor = System.Drawing.Color.Red;
}
I also tried using
ss.DeliveryMethod = SmtpDeliveryMethod.PickupDirectoryFromIis;
Now it doesn't throw any exception, it executes fine but receiver does not receive any mail in his inbox. How can I fix this? Edit - This is the stack trace im getting.................
I am trying to stop the caching of web pages using the following snippets in the ASP.NET however its not working and showing following error to me,
Response.CacheControl = "no-store";
Response.AddHeader("Pragma", "no-cache");
Response.Expires = -1;
[code]...
I'm testing our OpenNetCF's Padarn Web Server.
In one of their Hands-On-Labs (HOL P101), an exception is being thrown at
private WebServer m_padarnServer = new WebServer();
The exception reads, "Exception in ConfigSectionHandler".
If you have experience with Padarn, have you received this exception before? If so, can you shed some light as to what I may do to debug this error?
I am having this strange case, at first time when the page loades, everything goes fine. But as soon as I click on any link which makes any ajax request, after that, I get this error while trying to read the configuration."System.Configuration.ConfigurationManager.ConnectionStrings' threw an exception of type 'System.Web.HttpException"I am using asp.net mvc 1.0
View 2 RepliesI'm Using Ajax POP UP Extender Control ... and The Panel Which will appear in The POP UP Has Data List ... Inside That DataList i have Image Button For Each Item In Data List.... When I click in any Image Button in That DataList ......I Get That Error At run time Microsoft JScript runtime error: 'this._postBackSettings.async' is null or not an object
... My ASPX Code is
[Code]....
And I put that code inside update panel and ToolkitScriptManager
I have page that works ok on localhost, but it throws an error on server. This pages was working ok before until I added additional grid to updatePanel. Is there any limit how many grids you can have in updatePanel. The error message is below.
Message: Sys.WebForms.PageRequestManagerServerErrorException: An unknown error occurred while processing the request on the server. The status code returned from the server was: 500
Line: 4723
Char: 21
Code: 0
I have a radcombobox in radgrid nested inside FormTemplate:
Code:
<telerik:RadComboBox Skin="WebBlue" Width="250px" Height="150px" runat="server"
ID="TitleCombo" OnDataBound="Title_DataBound"
SelectedValue='<%# Bind("Title") %>' AppendDataBoundItems="true"
OnSelectedIndexChanged="Title_SelectedIndexChanged" AutoPostBack="true" />
then i insert an item to the top of list (at zero index):
Code:
protected void Title_DataBound(object sender, EventArgs e)
{
var item = (RadComboBox)sender;
item.Items.Insert(0, new RadComboBoxItem("Select title...", "0"));
}
It works perfect but, IF the Title field is zero and you Click EDIT LinkButton it throws an exception: Selection out of range Parameter name: value I would say that it's expected as zero index does not exist at the moment when i click edit button. I bind the combo from within RadGrid1_ItemCreated event.
In our application we have to access session objects in business class. We are using HttpContext.Current.Session to get the session value. In some cases it returns the value but mostly its throwing a null reference exception(Object reference not set to an instance of an object). We have the following code Try
If HttpContext.Current.Session("Username") IsNot Nothing then
' Statements to be executed
End If
Catch ex As Exception
'Log to db
End Try
Here HttpContext.Current.Session("Username") is mostly throwing an exception "Object reference not set to an instance of an object" While debugging we found that HttpContext.Current itself is nothing.
I have a static dictionary object which hold some Key and Value pairs in our site.We are getting Indexoutofrange exception some times and we couldn't figureout the problem why it is causing.This error is logged several times in the log file and site went down.Do you have any idea why this is happend?Please provide your advice ASAP as we are facing this issue in live server.
View 6 RepliesA dataview is throwing an out of range exception when a page submit button is clicked. The strange part is if you change the data in the dataview by selecting a different person in the DDL the page works fine. Its only when the page loads and the default person in the DDL is when the DataView throws the exception.
The exception is thrown on the last line when I add DV.Rows(0).Cells(1).Text to the id_num parameter. I know there is a value in the dataview because it is displayed on the page. I can refresh the dataview with another person's information and the code works fine. This really has me confused. Here is a bit of the code behind.
Dim dashDataSource
As
New
SqlDataSource()
dashDataSource.ConnectionString =
ConfigurationManager.ConnectionStrings("SSSConnectionString2").ToString()
dashDataSource.InsertCommandType =
SqlDataSourceCommandType.Text
dashDataSource.InsertCommand =
"INSERT INTO tblAcadReferrals(all columns and parameter info here)"
dashDataSourceInsertParameters.Add("id_num", DV.Rows(0).Cells(1).Text)
Are there any Microsoft products, such as Sharepoint or Outlook Web Access, that make usage of ASP.Net Ajax and the Control Toolkit?
View 6 RepliesI m uploading file to a directory inside my website root directory like this-
[Code]....
I m getting exception-
System.IO.DirectoryNotFoundException: Could not find a part of the path 'C:Documents and SettingsAdminMy DocumentsVisual Studio 2008WebSitesElcomponics Sales-BDsamples�50841010_sd113201031833.pdf'.
Why so?
When i deployed my app on server and accessed it from client system. It is not throwing exception.What is the difference?
Still i want to confirm will it throw the same exception in case i deployed it to server and access it from client.
using vb.net/asp.net 2005
when a user enters a bad email I am doing a check on this and throwing an exception message as follows, this works fine on the test site but for some reason the same code on the live site gives a "internal server error" (http code 500). The code below:
[Code]....
not certain why this is happening, I assume that it's some server or config difference between the test and live sites. has anyone seen this before? For a quick fix i'm registering javascript alert and showing the same text so it works but I would like to figure out why the code above is not working.
Modal not showing up when show is called, also error on loading page. Attaching code below, can anyone help me discover my syntax / logic issues here?
NOTE: Did some research on this before posting, some claimed it can be an issue of where the modal is placed on the page in relation to the update panel I am using. I have tried different placements of the modal extender and I also tried removing the update panel all together in hopes to at least see the modal show, no go...same issue. So with that, the issue shouldnt be around the use of the update panel...
Here is the error:
icrosoft JScript runtime error: Sys.ArgumentNullException: Value cannot be null.
Parameter name: elements
and the code...
I am using Server.Transfer("axpx page", True) in my page.aspx.vb code. This line of code is there in the Try block. The exception "error : canot obtain value" is occurred when this line is executed. This is started all of sudden in the production.I have temporarily fixed this by keeping this line after try - catch block. But I'm not sure why is this problem occurred?
View 8 RepliesI have added linkbutton inside gridview to download, below is my code..
protected void lnkDownload_Click(object sender, EventArgs e)
{
try
{
[Code].....
its giving me following error
"Unable to evaluate expression because the code is optimized or a native frame is on top of the call stack"
This question may sound strange and defy all programmer's logic, but I want to know if there is any way I can do AJAX on a website (ASP.NET MVC) without using the extensions provided by Microsoft?
I've done AJAX using PHP w/ jQuery. This is the first time I'll be doing it with ASP .NET, however the requirement is that I cannot use Microsoft's AJAX libraries or jQuery (or basically anything thats easy).point me to any resources that might help me re-invent the wheel?
I can find loads of articles about using the CD to load the Ajax framework, but I can't find anything regarding not using it.point me in the right direction.
ASP.Net 4
