.net - String Exists In A Collection Stored In .Net Session State?
Jan 8, 2010
I have an ASP.Net app that retrieves a collection of roles for a given user. Each role is a string. There's rarely more than 2-3 roles for any one person.I wanted to store the colelction of roles in Session state to save the time accessing the DB on each request.I basically want to write code that checks if a given string exists in the collection to test if the user has that role or not.My question is...what's the best way to do this? Is an array the best collection to store the role strings in Session with? Or is a dictionary better? I figure an array will take less memory (I don't really need a key + value) although a dictionary might lookup faster.
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Jul 27, 2010
I am creating a presentation on basis of some selected values and maitaning the selected values in a session variable named Session("userPref") in collection form.
Now I am opening a TablePreview.aspx page by javascript window.open() function.
On Page_Load of TablePreview.aspx I am reading some values of Session("userPref") and doing some operatons.
For saving the presentation I have created a page wizardsave.aspx.
Now I am opening the wizardsave.aspx from TablePreview.aspx by window.open() function for saving presentation, but on Page_Load of wizardsave.aspx. I found that some value from collection stored in Session("userPref") have lost.
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Dec 8, 2010
What is the function used to check a session exists or not?
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May 3, 2010
which place(exact folder) the session & session id will be stored?
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Aug 31, 2010
I would have a dataset that I would break into 5 new generic LIST<>. Now the user needs to see one record at a time and navigate through the list
Fields like
From date : Text box with calendar
To Date : Text box with calendar
Manager Reporting To : Drop down list
Buttons on Move Back and move Forward
Now I would have 4 such similar lists which I have to pick up from the audit table. When the user clicks on move back and move forward buttons he should be able to navigate through records in my list that I have fetched in the beginning . I can store itin a session or viewstate till it gets updated again. How do I achieve this.
Should I be writing a webmethod to go back and pick up the next record agian and display
Can I also a gridview instead of textboxes.
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Aug 12, 2010
Imagine I have 3 classes (student has Marks which has subjects)
[Code]....
I got a List<Student> populated with all the student and nested collection of corresponding Marks and subjects.How do I, before binding this list to any grid, filter records to display only those students, who surely have appeared in subjects with name "X" and "Y"?I tried something like:
[Code]....
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Apr 2, 2010
l am facing a problem with session.
If many users access the site, the session gets crashed and data which i store to access across pages is getting lost.
a best way to store data (as session does) so that i can use the data across my web application.
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May 30, 2010
i have done the following
void Session_Start(object sender, EventArgs e)
{
// Code that runs when a new session is started [code]...
basically am using them to store user id and status, so that pages can be validated, by there use.i can stop person from accessing home directly wihtout signing is and so on.can session variable be hacked as they are stored in an external data source and are available to the full website?
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Jun 14, 2010
Is there a way to add List in session? or any other way to pass the values of List in another page?
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Feb 7, 2011
Is it possible to assign the connection string in session variable and is it the good way to declare in session.
provide the sytax for accessing connection string from session variable
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Aug 30, 2010
Example scenario:
User login has a list of associated 'accounts' it has access to... this list of accounts is stored in a database table, say tblAccountAccessControl, something like:
login, accountID
userA, account123
userA, account456
userA, account798
userB, accountABC
userB, accountDEF
etc..
This info is used throughout the web application and determines the 'domain' of information the particular login has access to. For example there are many other tables that have the 'accountID' field and whenever a page pulls data from the table it only pulls data that the currently logged in user should be allowed to see, based on that tblAccountAccessControl data.
The security question:
Do I need to query the database every time I need to get this list of allowed accountID's? I was about to use a plain old query string to pass a particular accountID to another page but quickly caught myself as I realized that would be a major security flaw (the receiving page was going to use that accountID to grab info from the database, and there would be nothing preventing a user from simply typing in a url manually to get data from an accountID they are not supposed to be allowed to view). So I then thought I'll just store the list of accountID's in a session state variable so they will be carried with the user throughout the session.
But then I remembered there are tools out there that allow you to easily intercept and modify asp.net viewstate information and I'm not sure if that would included session state variables, but I'm guessing they would. Is there a way to create a secure query string? If I used session state would that session state information be exposed and modifyable by utilities out there? Am I just stuck having to query the database every time I need this info to assure security? What about encrypting it and then storing in session state variable (just thought of that one)?
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Jan 1, 2011
Parser Error
Description: An error occurred during the parsing of a resource required to service this request. review the following specific parse error details and modify your source file appropriately.
Parser Error Message: Server tags cannot contain <% ... %> constructs.
Source Error:
[Code]....
Source File: /Dec-12/myprofile.aspx Line: 101
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Feb 5, 2010
Can I set the connection string for custom session state mode in global.asax file? I cannot hard code the connection string in the webconfig file. ,I will get the connection string at runtime,Can i set the connection string for custom sessionmode/sqlserver session mode in the global.asax file(like in application statrevent, or aquirerequeststate event.If YES How to do that?
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Dec 7, 2010
Have not run the ASP.NET Development Server for a while. Today I copied a production website to my workstation and ran it with VS 2008. The following error message popped up. What is the problem with the ASP.NET development Server on my workstation? The website on the Production server still ran okay.Unable to make the session state request to the session state server. Please ensure that the ASP.NET State service is started and that the client and server ports are the same. If the server is on a remote machine, please ensure that it accepts remote requests by checking the value of KEY_LOCAL_MACHINESYSTEMCurrentControlSetServicesaspnet_stateParametersAllowRemoteConnection.
If the server is on the local machine, and if the before mentioned registry value does not exist or is set to 0, then the state server connection string must use either 'localhost' or '127.0.0.1' as the server name.
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Feb 11, 2011
I have this code that loop through table controls how do stick the seleted information into a session variable. Then i have to pass it into another page table control.example code
[Code]....
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Jan 17, 2011
I would like to know if the way i'm dealing with session variables is the right way, and also how to fix this error i'm getting:
FormatException: Input string was not in a correct format.
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Nov 18, 2010
I read the solutioin for this error, at the following link :http://forums.asp.net/p/1046935/1576341.aspxbut I am still not clear what exactly causes the error. I have two doubts :1. Can anyone please elaborate a bit on this issue, with any example ????2. Is there any drawback of this approach ?
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Feb 16, 2010
In ASP.NET, I'm a bit confused about role of cookies in session state. Whats is the difference between normal session state and cookieless session state?
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Mar 9, 2010
i have a listview control with two textboxes in each row. i am to fill those and save their values in one/more than one database tables using a stored procedure.
i currently create a comma-separated string (using a string builder) of all the values, and then pass it as a parameter to the SP.
in the SP i extract the values, and put them into my tables.
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Feb 4, 2011
I have a web app with loads of pages and most of them require some session variables in order to function.i want to put some defensive code in my master page's page_load or init events to detect if the user has a session (meaning any session variable instead of a particular variable) and if not redirect them to the homepage to start all over. whats the best way to do this? should i use session_end instead?a simple solution for this would be best.EDIT:so i am guessing the master page is the place i want to add this to?
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Oct 2, 2010
User Interface: 2 Labels; 1 Buttons
Requirements: Create a Web Page in ASPx that will do the following:
1)One label will provide a count of how many times Button 1 has been clicked in the current session.
2)One label will provide a count of how many times Button 1 has been clicked by all users of the application. The Application Code for the Button should start at 100 (set this in the Global.asax file). this is what i have so far but i cant seem to get the application state to work properly.
aspx.vb
Partial Class _Default
Inherits System.Web.UI.Page
Dim clickcount As Integer
Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
If Session("ClickCount") Is Nothing Then
clickcount = 0
Else
clickcount = CInt(Session("ClickCount"))
End If
If Not IsPostBack Then
If Request.Cookies("UserName") IsNot Nothing Then
Label1.Text = "Welcome Back " & Request.Cookies("UserName").Value & "."
End If
End If
Dim clickCounta As Integer = CInt(Application("ClickCount"))
End Sub
Protected Sub PostBackSession_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles PostBackSession.Click
clickcount += 1
lblClkCnt.Text = "Current Click Count is " & clickcount
Application.Lock()
Dim clickCounta As Integer = CInt(Application("ClickCount"))
clickCounta += 1
Application("ClickCount") = clickCounta
Application.UnLock()
AppClick.Text = clickCounta
Dim nameCookie As New HttpCookie("UserName", _
TextBox1.Text)
nameCookie.Expires = Now.AddYears(1)
Response.Cookies.Add(nameCookie)
End Sub
Protected Sub PostBackSession_PreRender(ByVal sender As Object, ByVal e As System.EventArgs) Handles PostBackSession.PreRender
Session("ClickCount") = clickcount
Application("ClickCount") = clickcount
End Sub
End Class
global.asax
<script runat="server">
Sub Application_Start(ByVal sender As Object, ByVal e As EventArgs)
Dim clickCounta As Integer = CInt(Application("ClickCount"))
Application.Add("ClickCount", 0)
End Sub
Sub Application_End(ByVal sender As Object, ByVal e As EventArgs)
Dim clickCounta As Integer = CInt(HttpContext.Current.Application("ClickCount"))
End Sub
Sub Application_Error(ByVal sender As Object, ByVal e As EventArgs)
' Code that runs when an unhandled error occurs
End Sub
Sub Session_Start(ByVal sender As Object, ByVal e As EventArgs)
End Sub
Sub Session_End(ByVal sender As Object, ByVal e As EventArgs)
End Sub
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Jan 19, 2010
How can I store session in a collection (key, value) during one page. I must be able to add and remove items.
Is there an existing control?
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Mar 19, 2011
Is it possible to use mixed cookieless sessions with cookie sessions? I've an application that captured user details and then redirect for payment to an ssl page. I was wondering if this is possible? [URL] redirects to [URL] Note: the session Id in the latter url. So in essence, we use the standard cookie session for the majority of the application but when we transfer to an ssl page we pass the SessionId to the https url to pick up the session. I've tried this locally but it starts a new session.
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Jan 29, 2011
I have this program in which I am trying to store a collection of values into a list and session
Example:
valueCollection = (List<Values>)Session["Value"];
I want to do the front end in a way which will show a table with each row showing a label and textbox. This would be too simple to do obviously but I want it to show 4 rows of the table by default and then the user can select "add another" this will then add another row onto the table with a label and textbox exactly similar to the 4 default. Everytime the user selects "add another" the table increments by 1.
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Nov 5, 2010
Customer were getting "View State Validation Error" due to worker process recycling at our production webserver and to fix that i applied machinekey and then move my Session state Mode from In Proc to State Server to retain session data and not kick out the customer to relogin. I had serialization issue with one object which has to be stored in session but when i moved it out of session i could able to resolve the issue.
But doing all these i was partly successfull in keeping the user in their session when Worker Process recycle event occurs.I was able to refresh the page or make a post back by clicking the refresh button and also able to retain the session values. But the Problem occurs when sending asynchronous request to server which we do periodically every 15 minutes from the moment the user logs in.The web page doesnot update data on website when sending asynchronous request.By Debugging I found at this particular code point it fails to make a postback which is required.
<%=GetHintFromServer%> (When there is no Worker Process recycle i t gets replaced by
WebForm_DoCallback('__Page',message,ShowHint,null,null,false) on postback) Everything works fine when there is no Worker Process Recyling but when it happens looks like sending request asynchronously using javascript fails .Remember When I make a post back by manually clicking submit button everything works fine.
SendRequest(Asynchronous)
function SendRequest(msg, isBusy, chartMsg, vesselMsg)
{
try
{
//confirm("msg"+msg+"isBusy"+isBusy+"chartMsg"+chartMsg+"VesselMsg"+vesselMsg);
_busy = isBusy;
if(chartMsg != null)
{
//confirm("chartMsg"+chartMsg);
_element.SetMessage(true, chartMsg);
}
if(vesselMsg != null)
{
confirm("chartMsg"+vesselMsg);
_element.ShowVesselLoading(true, vesselMsg);
}
_stuckWatchdog = setTimeout( "ClearPendingRequest();", 60000);
var message = msg;
var context = '';
<%=GetHintFromServer%>
}
catch(e)
{
alert( "Exception error on SendRequest(): " + e);
}
}
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