Why can't I do this?
if ((bool)Request["genericError"] != true)
{
return;
}
Compiler gives me:
Cannot convert type 'string' to 'bool'
Request["genericError"] should be an object, so why does the compiler think its a string?
I'm looking for the reason for this, not how to sidestep it (using Convert)
I get a casting error on line #8 below which reads "db.UserID = Session("UserID")". What would be the correct way to cast this? The datatype of the DB field is GUID.
[Code]....
Currently in an .aspx file, I am storing a value (filename that was created in that session) in an hidden text box. When the user clicks on the "Print" labeled Hyperlink control, it opens the file that was stored in the hidden text box control. But when the user goes to different screen (in the same session), I loose the filename value that is stored in the hidden text box control. So I would like to store the filename variable in a session variable. So that if the user leaves this .aspx file and comes back to this .aspx file I can load the value into the hidden text box from the session variable.
View 11 Repliesi create a sproc for validation username and email address lilke below:now i use this sproc like below:
[Code]....
Error 6 The best overloaded method match for MisaghDataContext.usp_ValidUserNameEmail(string, string, ref bool?)' has some invalid arguments
can we grab a global variable or Session or View State variable in the javascript or using jquery?
I have a web application which uses a session variable to store the logged in userid. If no user is logged in, of course this variable will be empty and the contents displayed on my website are meant for guests. If there is a user logged in, the user specific controls/access/links will then be a displayed.
I am now having issues with my hosting where on shared application pool, the worker recycle is triggered every 90 minutes, this will clear sessions causing all my users to be logged out. I opted for a dedicated application pool, which got worse because I am only allocated 50MB memory limit and if this is reached, the worker recycle is triggered and I lose my sessions again. I have tried as much as possible optimization techniques, e.g. dispose where possible, close connections, disable viewstate for static controls etc but my memory per instance keeps building up from page to page without any signs of improvement. I don't use loops nor store huge objects like bitmaps etc but my sessions are now gone even faster than 90 minutes in shared application pool before.
I have considered using SQL Session State but there isn't a simple guide on using this with MySQL. I am getting desperate and considering using a public variable, a string as a replacement to store logged in user id instead of in a session variable. I am pretty sure this will solve my issue with sessions being recycled but are there any negative consequences of doing this? One problem I can think of is if the user closes the browser, the system will never know that the user is now logged out and this public variable should be nothing. In this scenario, will the GC eventually clear this abandoned public variable.
System.InvalidCastException was unhandled by user code
Message=Specified cast is not valid.
Source=App_Web_donate.aspx.cdcab7d2.wqdohvu3
StackTrace:
at Donate.LoadUserDetails() in C:UsersSimonDesktopLocal SitesCats ProtectionNewDonate.aspx.vb:line 261
at Donate.btnDonate30_Click(Object sender, EventArgs e) in C:UsersSimonDesktopLocal SitesCats ProtectionNewDonate.aspx.vb:line 205
at System.Web.UI.WebControls.LinkButton.OnClick(EventArgs e)
at System.Web.UI.WebControls.LinkButton.RaisePostBackEvent(String eventArgument)
at System.Web.UI.WebControls.LinkButton.System.Web.UI.IPostBackEventHandler.RaisePostBackEvent(String eventArgument)
at System.Web.UI.Page.RaisePostBackEvent(IPostBackEventHandler sourceControl, String eventArgument)
at System.Web.UI.Page.RaisePostBackEvent(NameValueCollection postData)
at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)
InnerException:
I have made the important bits Bold I have the following code which is generating this error:
[Code]....
I am not entirely sure what is causing it. Its completley intermitent. I am storing all the details of a user filling in a form in a structure, and then assigning that structure to a session variable. This means if they page back, and then page forward again, I can pre-populate the form with the details they have already filled in for their conveinience by using the above code snippet. It appears that it works for a good minute, but if I leave the browser alone any longer than roughly 60 seconds, and then try and page forward to the form again, the exception will fire. While writing this post, the exception has occured in again in firefox, but interestingly, Google Chrome doesn't seem to have this problem. It looks like I can leave chrome alone for as long as I want and it will still work.
What would be the proper syntax in ASP.NEt 3.5 C# to assign a TextBox value to a temporary or session variable to be manipulated (added, subtracted, multiplied, divided) at different points in the application? I want to add a decimal number to this variable in almost every instance as well.
View 3 RepliesI have the dataset. in this i am having total 20 tables with huge amount of data..I want use this data over all the page..so where i can keep this data..
before i used viewstate but the viewstate data is render to page every postback ..so this time the page size is increasing(interanlly viewstate is rendered to page)..so performence wise it was very slow..
Now i change my logic insted of viewstate to i used Globel Dataset on Page Level.. now the performence wise better than viewstate..
i used Like shared dsControls as Dataset at top of the page..so every time i use this dataset..
my quesation is session is better or Globel variable is better way use in my situavation..
I added the following code to global.asax to load up several session variable when a session starts. I'm assuming that when a page goes to use the variable that I should be
1) checking at the page level that the value is valid not 0 when its not expected to be 0, not a zero-length string when its expected to have a length
2) have code at the page level that sets the values if the values have not been set as when the Session timeout, ideally putting the code in a class derived from Page and then deriving all of my pages from the new class so that the code does not have to be repeated in every page
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I have some code in my page load event where I just want to fire once when the user opens the Browser. The only issue is if you open a new tab with the same website the session variable does not reset. Is there a way to reset the session variable when you open a new tab or do you have to take the whole web browser down for it to clear the session variable.
In Global Page:
[code]....
I have been spending a better part of a week trying to track down why I am not able to clear all session variables in a web app (vs 2010, vb.net). What I have tracked it down to is that when I remove or abandon sessions that my html pages or codebehind access, it works, but for some reason in any of my class files where I use "Public Shared strConnection as String = HttpContext.Current.Session("strConnection").ToString" to access a session variable, it finds the old one and not the current one. I have to wait for it to time out, go in again, and it will find the new one.
I do not use Linq, and there is only one place in the whole web app that I place the connection string in a variable whcih is when a person logs in. It points them to the correct database. The sqlconnection is set for all of my listviews in Page_Init to make sure that they aren't using any session variable that they create on their own. Interestingly enough that if I use debug to go in each time, exit debug, enter debug again trying to access a different database, it works correct each time. I assume that debug is correctly killing the session variable for the classes for me.
I have some cascading dropdownlists using the ajax toolkit I have a set up datatables in an xsd file. Then use these in a webservice to populate all the fields ... this all works great but now i need to pass an additional paramter to the first dropdownlist ( a date) but don't know how to do this? The method is below...
[Code]....
The other code is:
[Code]....
The first change would be to the tableadapter to add a param to the code i.e
AuditWebDS.TeamsDataTable teams = teamsAdapter.GetTeams(calldate);
but how do i get the calldate param to the webservice method... i tried a session variable but it comes up with session is null ? Is there another better way?
I am new to asp.net Can you please guide me what is session and session variables ? Please I don't need a comparision of asp session and asp.net session because I don't know anything about asp. I have saw many articles on types of session as well. But still I cant understand exectly what is session and what are session variables in asp.net ?
View 9 RepliesI have following code in my class file which returns me the Date field in format like 4/4/2010 12:00:00 AM from SQL SERVER
public IEnumerable Mthgetcomplaintdate()
{
var v = objderma.USP_Patient_Dermatology_Complaints_RepDate(PatientID); ;
return v as IEnumerable;
}
But on my aspx page i want to display only the Date part not time.One way is i will iterated throgh my dropdownlist which am binding with the above method and i convert it using Toshortdatestring() method.But i want to cast the whole Ienumerable result using some method? I have read about cast<> ,but could not understand how to implement it exactly.
I'm working on converting the TailspinSpyworks shopping cart Joe Stagner wrote in C# to VB using an evaluation version of VS 2010. I have the following public function:
Public Function GetShoppingCartId() As [String]
If Session(CartId) Is Nothing Then
Session(CartId) = If(System.Web.HttpContext.Current.Request.IsAuthenticated, User.Identity.Name, Guid.NewGuid().ToString())
End If
Return Session(CartId).ToString()
End Function
For Session in Session(CartId) I'm etting the following error: 'Session' is not declared. It may be inaccessible due to its protection level. For User in User.Identity.Name I'm getting the same error: 'User' is not declared. It may be inaccessible due to its protection level
It has been reported to me that a user logs into our web application and after supplying the correct credentials for themselves, are taken to the next page where they see a different customer's name at the top of the screen.
All the data at the top of our web pages is stored in session variables. The login page executes a Session.Clear statement in the Page_Load event. The user enters a username and password which is validated against our supplied database via an SQL statement. Once the user is proven to be valid, session variables are set to hold the Customer's name, as well as a few other details about them.
This is a fairly simple application, consisting of only of about 10 different pages. I am only tracking about 5 session variables per user. The session variables are initialized to either 0 or "" in the global.asax file in the Session_start routine. Upon clicking a "log out" link on any page, the login page is displayed again (executing the Session.Clear statement).
We have roughly 400 users logging into this site about once or twice a week each. The site is hosted on a server running Windows Server 2008 R2 Standard and IIS 7.
Of all 400 users, this strange session behavior has only been reported to me on a couple of occasions.
I have tried to duplicate this behavior and have not been able to. Has anyone ever heard of this? Where should I be checking for solutions? I have already checked my SQL statement and database for user authentication to make sure it is working correctly.
I have a session variable with year stored in it and in my if condition I want to check if the current year is one less than the year in the session variable like this:
[Code]....
This isn't allowed though. It says operator '-' cannot be applied to operands of type object and int. How would I do this subtraction?
I have a three step wizard. On the first step I use a repeater to create a series of buttons that an individual can select from. When the user selects one of the buttons the value of the button is saved to session state. They are taken to the next step and shown a similar list of buttons that are based on what they previously selected. Thus, if you choose "Hamburger" you might receive the options of "onion", "lettuce", "tomato" while if you choose "Hot Dog" you might receive "sauerkraut" and "ketchup".Lets say an individual chooses Hamburger. This is saved into session state like so:
Public Sub Button_ItemCommand(ByVal Sender As Object, ByVal e As RepeaterCommandEventArgs)
' ******** Lets pass on the results of our query in LinqDataSource1_Selecting.
Session("food_select") = RTrim(e.CommandName)
Wizard1.ActiveStepIndex = 1
End Sub
Now, this works fine and dandy. But lets say I select hamburger and then realize I'm really hankering for a hot dog. I go back to the first wizard step and click on the hot dog button but when the wizard progresses to the next step I still see the options for hamburgers! The session variable has not been updated.
Given this Global.asax.cs:
using System;
using System.Web;
namespace Foo.Web {
[code]....
User hits webapp and is shown Introduction.aspx
User continues using webapp for a few minutes (ASP.NET_SessionId: ublbhu45ji31e055ywqu0555)
User falls idle (doesn't perform any postbacks) for a few minutes
User performs postback
User is shown Introduction.aspx
Second inspection of user's ASP.NET_SessionId cookie still shows ublbhu45ji31e055ywqu0555
Why is the user shown Introduction.apsx the second time inside the same ASP.NET Session? I'm familiar w/ the risk in setting session variables just before a redirect in the same postback, but that doesn't apply here, right?
Partial Class Preferences_MyPreferences
Inherits System.Web.UI.Page
Dim userID As String = Session("UserID")
This is just a page in asp.net. I want to be able to grab the Session("UserID") but every time I try, I get this error:
Session state can only be used when enableSessionState is set to true, either in a configuration file or in the Page directive. Please also make sure that System.Web.SessionStateModule or a custom session state module is included in the \ section in the application configuration.If I put that Dim userID inside say the Page_Load Event, then it works fine. Why does it have to be inside an event? I want to dim it once, and use it throughout the page.
i am redirecting from a 3rd party site to my application where i am getting the responses of credit card no,cvv no and exp date into my application.but the session data that had come from the previous page is being lost.i have tried using application instead of session and its working fine will there be any disadvantage of using application over session
View 9 RepliesI need to Initialize a value in a Javascript by using a c# literal that makes reference to a Session Variable. I am using the following code
<script type="text/javascript" language="javascript" >
var myIndex = <%= !((Session["myIndex"]).Equals(null)||(Session["myIndex"]).Equals("")) ? Session["backgroundIndex"] : "1" %>;
However the code above is giving me a classic Object reference not set to an instance of an object. error. Why? Shouldn't (Session["myIndex"]).Equals(null) capture this particular error?
I am using ASP.NET..........
It is possible to create a session variable on page load just for a particular page/url?
The problem that I have is: The user comes to page 1 and the session variable becomes A, then he opens page 2 in a new tab and the session variable because B on both page 1 and page 2.
So when the user needs the session variable on page 1 it does not work because the variable have changed!
string Landcode = Session("landcode");
gives a fault message: Error 2 The name 'Session' does not exist in the current context I see the word session in the intellisense. And the session variable is declared in the global.asax.
void Session_Start(object sender, EventArgs e)
{
// Code that runs when a new session is started
string landcode = Request["strLandCode"];
}