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]...
The environment:
Development:
Windows 7 64bit running microsoft visual studio to develop an ASP.NET web application in C#.
Production:
Windows Server 2003 : Microsoft.Net V3.5 : IIS
Application:ASP.NET web application with forms authentication using an Active Directory provider to authenticate against our domain controller. Once authenticated users can select reports which populate a gridview with data from an SQL database.
Background:The web app works flawlessly on development and production. Users can navigate to, authenticate, and access all information on the web app.
Due to sensitive connectionString and active directory provider information in my web.config file we have decided to encrypt those parts.
After researching different methods we chose to do a machine level RSA encryption.
The method which we are following in CMD:
1. cd c:windowsmicrosoft.netframework"version"
2. aspnet_regiis -pc "containerName" //this creates the key container
3. aspnet_regiis -pa "containerName" "NTAUTHORITYNETWORK SERVICE" //this creates an ACL for the NETWORK SERVICE user to be able to access the
container and decrypt the web.config file
4. aspnet_regiis -pef "connectionStrings" "C:inetpubwebsiterootdir" -prov "provider" (where provider is the name of the encryption provider in
web.config) //this uses the encryption provider to encrypt the data then storing the key in the container that we created in step 2.
5. Repeat this process for any other sections of web.config with sensitive info.
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 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'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 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)
I 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.
I am devloping ASPX pages and I want to prevent caching of pages. So i have used the following code:
<% @OutputCache Location = "None" Duration="1" VaryByParam="none" %>
But this code is working only for the desktop browsers. This is not working in mobile browsers.
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'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[Code]....
How to prevent browser from caching image, Trsponse.Cache.NoStore didn't work
since asp.net contains multiple threads that are executing at the same time.so if 2 threads access an object (simple or complex) that i got from the the asp.net httpcontext Cache.can't this lead to state problems on that object if these 2 theads tried to modify/read it at the same time?so what kind of precautions should i implement?for example i am thinking maybe locking the object while working with it? (wont this cause performance problems?)or maybe when i retrieve some object from the cache i should create a copy from it?
or maybe i dont need to worry about this issue at all?
How do I prevent nullreference exception (Object reference not set to an instance of an object.) on
[Code]....
specifically on referencing ClientID of the control in JavaScript
I have an ASP.NET application that was working fine on my server up until last night when I installed a bunch of windows updates, now it's throwing this exception : System.Security.SecurityException: Requested registry access is not allowed.Unfortunately there is some things that makes this hard to debug. I added the debug="true" attribute to the web.config file to get the line where the exception is lauched. The line identified in my code is an End If and the code just before seems benign :
<body id="body" runat="server">
<div class="conteneur-confirmation">
<%
[code]...
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?
[Code]....
I am using microsoft visual web developer 2010 to build and publish my website, I am facing a security problem. My website has authentication service for my clients, each one he has his own user name and password. After I introduced a new member, my database collapsed, may be this last member is a hacker. Is their a way to improve security vulnerabilities to prevent future attacks. May be through web.config, could be encrypted.
View 11 RepliesError:
Security Exception
Description: The application attempted to perform an operation not allowed by the security policy. To grant this application the required permission please contact your system administrator or change the application's trust level in the configuration file. Exception Details: System.Security.SecurityException: Request for the permission of type 'System.Web.AspNetHostingPermission, System, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089' failed.Local its run fine. when i place in iis. it throw this exception.
I have created user web control library project and these controls i'm using in my web application. These User controls just works fine in my local machine but when i moved this project(including Library) to our Local server , it is throwing security exception
Error 1 Cannot register assembly "LocalServerLibraryDemoLibraryDemoLibraryinDebugLibrary.dll". Request for the permission of type 'System.Web.AspNetHostingPermission, System, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089' failed. Library
Anybody knows why this error occuring...?