Asp.net - Session Disappears Unexpectedly?
Apr 26, 2011
The site is a buy/sell site and the page the code comes from is the "add product" page.
The problem is that the session("change") becomes nothing by some reason, i cant find any errors.The payment.aspx have a button that sends me back to the page with a session("change"). The reason i see the problem is that i when i try to edit something the category gets restetted to the first in the list. and when i debug i see that the session is nothing, though it should be something
Heres the code:
Protected Sub Button1_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles BtnSubmit.Click
If Not stats > 0 Then
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Dec 8, 2011
I am storing a session variable that a user types into a textbox. With their valid input, their session gets created and they get a little more functionality than the regular end users of the site.I was wondering if it is possible to find a way to add someone's session variable to the end of a URL. This way we can email a link to one of our clients, they click it, and their session has automatically begun. They already have the textbox to enter their code into, but I was told that it would be much easier for the users to just click a link that will start their session.
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May 28, 2009
On startup of my software which i developed in vb.net, it connects to mssql server. I want to have session id or session number of the connection with mssql. I'm sure it is unique number and i want to use this session in my software for different purposes. My question is
1. is there anything like session id or session unique number when you connection mssql server
2. if yes to 1 then how i can get it in vb
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Nov 2, 2010
Can you write code to tell an event not to fire? Sometimes in my applications events fire unexpectedly. I know this is a broad question, but it must have happened to others out there.
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Jan 26, 2010
I am having an issue with a cookie that keeps getting deleted by the application. When you go into the application, if the cookie does not exist, it gets created. This works fine and everything in the cookie is stored correctly. When I click on a link to go to another page, once everything loads completely, the cookie gets deleted from the file system. Even stranger than that, the values from the cookie remain until the browser is closed. That is the application appears to be retaining the values even though the cookie does not exist on the local file system. The next time you enter the application, the cookie is recreated so any values stored are lost.Now, I have done some tweaking on the code to see what could be causing it. I found that I am adding the cookie to the Response object any time I make a change to the cookie. The cookie is also being added to the Response object when the page load is completed. My initial thought was that adding the cookie multiple times to the Response object could be causing the issue. I commented out the code in the page load complete event and the cookie hung around until the next postback. Then I put in some logic to keep the application from putting the cookie into the Response object more than once, and then I lost the cookie again at the same point as before.All of the code for handling cookies is in my "base page" that all pages inherit from. The page that seems to be loosing the cookie is my search page. I am including the code from both of those pages.[code]
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Feb 16, 2010
I fail to build project in window7 64 bits. I am using VS 2008. Its working fine at vista 64 bits but when I compiled it at window7 64 bits, I get the following error:
C:WindowsMicrosoft.NETFrameworkv3.5Microsoft.Common.targets(1682,9): error MSB4018: The "GenerateResource" task failed unexpectedly.
C:WindowsMicrosoft.NETFrameworkv3.5Microsoft.Common.targets(1682,9): error MSB4018: System.Runtime.InteropServices.ExternalException: A generic error occurred in GDI+.
C:WindowsMicrosoft.NETFrameworkv3.5Microsoft.Common.targets(1682,9): error MSB4018: at System.Drawing.Image.Save(Stream stream, ImageCodecInfo encoder, EncoderParameters encoderParams) .....
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Feb 24, 2009
I'm writing a program to help me understand 3d points and how computers manipulate them to 2d. Every time I run the conversion routine in my program the value I passed to it get's manipulated even though I use the ByVal key word. Here is the code in process order , tell me if I missed something here ?
[Code]...
There is a status box for me to check one of the values :> This is the flow of what I have put together so far. The problem is once I run the program everytime I press the up key to make a call to the GetPoints method the value in MyPoint is changed to reflect the forumula in the getpoints method. I explicitly used ByVal in my variables on the method call so the values in the variable would not be manipulated. I've changed it many times but I can't seem to get the method to run where it does the conversion without manipulating the values in MyPoint. I've done similar things in visual basic .net 2003 , Now I am using the visual basic .net 2008 express edition. I don't if there is a difference in the two or some unknown bug.
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May 22, 2009
I have a modal form with a single instance of the built-in .NET 2.0 tab control. The tab control has several pages, and on one of them is a combo box that isn't populated until the user activates it for the first time. When that happens, I handle the DropDown event and run a process that takes several seconds, then I add the items returned by that process to the combo box.It works fine, except right after the list portion of the combo box is dropped down, it immediately closes as if some other control took the focus. I've narrowed it down to the fact that there is a tab control on the form, and the process that retrieves items for the combo box takes more than 4 seconds. If I create a completely blank form with just the combo box, I don't see this behavior.
Needless to say, this is strange beyond belief. Any idea why the tab control would interfere with the control that currently has focus?
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Jul 9, 2010
I'm having a problem with a Visual C++ 6.0 DLL that I want to use in my VB.NET (3.5 SP1) project. I'm working with VS2008 on Win7 64bit. When I reference the DLL and build the project I get the following 3 errors:
The "ResolveManifestFiles" task failed unexpectedly.
System.ArgumentException: Illegales Zeichen im Pfad.
bei System.Security.Permissions.FileIOPermission.HasIllegalCharacters(String[] str)
bei System.Security.Permissions.FileIOPermission.AddPathList(FileIOPermissionAccess access,
AccessControlActions control,
[Code] .....
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Feb 3, 2012
BackgroundServer: Windows Server 2003 R2 SP2 Standard x64 (physical server).Executable â.exeâcompiled with Visual Basic 6.0 SP6.The executable is registered on the server with PI.exe /regserveremWe have no idea of what exactly it is that triggers the problem. But after a undefined time/load/operations on the server the registration of the executable is lost or When calling the executable following error message is returned: "Retrieving the COM class factory for component with CLSID {E6A1ECAC-AB5F-4E31-96F5-A0A0CA5EB134} failed due to the following error: 80080005The error is easily fixed with following commands: API.exe /unregserverAPI.exe /regserver
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Sep 2, 2010
I have an Enum file, as shown in first code block. Though it's first time I use an enum file, so maybe it's not correct to use it like this.. My purpose is just to be able to reference a global parameter from anywhere, so I can just type DataInterval.M1, and it will be treated as an integer... or.. will it not ? urther I have a property in my DataSeries class, of type DataInterval. And in this class I also have a bunch of methods Get/Set etc. to do different work on the dataseries (Inherits List(Of BarData)). roblem: The interval property keeps changing unexpectedly every time the GetNextCloseTime function is called.
''' <summary>
''' "Time Frame" of data series
''' </summary>
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Dec 18, 2009
I have a modal form that does double duty.When a user wants to add a new object to a database, I open the form blank and they fill it out. When the form closes, all of the data is passed back to my main form and is used to create the new object in the database.When a user wants to edit an existing object, I open the form and pre-populate all of the fields with the object's data.I'm running checks on the form as they edit the fields, only enabling the "OK" button (which will update the database) if the form has actually been changed. If they make a change and then undo it, the "OK" button is reset to Enabled = False.At the bottom of the form are a ComboBox, two buttons and a ListBox. The intent is to allow the user to select an item from the ComboBox and "Add" ("Add" button) to the ListBox, or select an item in the ListBox and "Remove" ("Remove" button) it FROM the ListBox.
This function works fine when the form is loaded blank.When the form is loaded with data, however, (and in the testing I've done, the ListBox has no items in it to start, which is valid), adding an item from the ComboBox to the ListBox causes the Modal form to close with a DialogResult of Cancel.I've tried to trace the source of this issue, but stepping through each line in debug mode gives me no clue as to why this is happening.I COULD remove all of the checks and update the form each time the user presses "OK" (in the case of no changes, the database data would be overwritten with the same data), but that seems kludgy and less elegant. Plus, I'd like this logic to work.
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Jun 4, 2012
I wrote a custom windows service (VB .Net) to run some processing on data files in the background of one of our servers. The service basically finds the next file to process, breaks it apart and makes a PDF or two - nothing super complicated. It utilizes a timer, if a file is not found, it waits a bit and checks again (repeat indefinitely). The service has run for a week or two with no issues/pausing/stopping. I have plenty of error handling for this and I have not been able to break it... until today.
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Apr 1, 2010
Whenever I enter text, even a single character, into a textbox in any Form in my application it causes the form and its parent to close. I've checked for the following so far:
Errant/mis-assigned event handlers that may be interpreting a keystroke as a Form cancel I am using keypreview in several windows but debugging shows this to not be a cause Happens in any form of the application Happens even with brand new text boxes dropped on the form Tried removing the WithEvents declaration from text box declarations (VB.NET)
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Aug 30, 2011
I have a strange problem on one machine that my VB.Net (.NET 3.5 - VS2008) app is running on, it runs a custom sized Powerpoint presentation in an IE control within my VB app. However, on one of the machines my app is installed on, the presentation always pauses on slide 2.
This is a kiosk type app, where there is no user interactivity. On all the other machines running this software, there is no problem. So it must be something related to the machine itself.
The PC is an XP Pro machine and was originally running IE6, which displayed the problem, I ugraded it to IE8 to see if this would fix it, but the problem persists. The machine is running Powerpoint 2003 (don't recommend upgrading the machines OS/Software- this is out of the question, as it is a business spec machine - even getting IE8 installed was a battle!)
The presentation itself has no complexity, all 15 slides are basic text and photos, no animation, no video etc. As far as I can tell, the problem is nothing to do with my software, or the Powerpoint slideshow, as this operates fine on similar machines and reinstalls made no difference, it must be a problem with the machine/installation itself. I've tried running the slideshow on the problem machine, in PowerPoint itself, rather than in my app, and it runs fine. I've also tried running it in an IE window, without running it through my app, and again, it seems fine.
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Jun 7, 2011
Here is the error I get when trying to debug my program: The "ResolveAssemblyReference" task failed unexpectedly.
System.IO.FileLoadException: The given assembly name or codebase was invalid. (Exception from HRESULT: 0x80131047)
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Dec 2, 2009
while looping through a short XML file called from xmltextreader retrieved from a webservice, I'm repeatedly getting the error: The request was aborted: The connection was closed unexpectedly. it constantly dies a row or two from completing the parsing.here's my short code:Code:
'Get the principal-id for Group Dim url As String = "https://xxxxx.acrobat.com/api/xml?action=principal-list&session=" & strCookie xmlRead = WebRequestToServer(url) Do While xmlRead.Read If xmlRead.NodeType = XmlNodeType.Element Then If xmlRead.Name = "principal" Then strGroupID = xmlRead.GetAttribute("principal-
[code]....
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Mar 12, 2010
I made button 4 on my form. When I run the program I find that it disappears.
I look at the visable property and I see that it is true. So what might be the problem. I also have button one that I put a message box it. When I hit the button durring run mode it will not activate. Have I missed up something here?
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May 16, 2012
I have a form with datagridview. I populate my datagrid with my dataset data.
Everything is going fine.
The only issue i found is.
if i lock the system and leave the form with datagridview containing data it it, and after some time (say 10 mins, when monitors goes to standby mode) if i unlock the system i see that the datagrid is empty. but a window with label has no effect its intact.
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Nov 4, 2011
I fill a dropdownlist item with the following commands
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Feb 24, 2009
I have a form that I am using to search for records in a dataset, it has a text box for entry of the search criteria and a 'Search' button to initiate the editing of the entry and .Filter on the BindingSource. This is one form in a project with many, when I show it using .ShowDialog it always disappears, (not visible and not loaded) after the 'Search' button is clicked, I have stepped through and there is no .Hide or .Close that it encounters, it performs all of the logic correctly but control is returned to the main form it was shown from. When I use the .Show method, I do not have this problem.
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Jul 26, 2011
I'm currently coding a multi-form project that requires a NotifyIcon. The first form is the Login form which then opens a 'logging-in' form and then finally another form (they're all opened using FormName.ShowDialog() and they hide themself before opening the next form).Login Form -> Logging In Form -> Final Form.When the final form is opened, the NotifyIcon's visible property is set to true and it appears in the tasktray like normal. But when I use Me.Hide on the final form, the NotifyIcon disappears with the form.Any ideas about what is going on? The program still runs in the background despite no forms are visible (which is how it's intended to be) but without a NotifyIcon, there's no way of making the forms appear again.
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Jan 18, 2010
I have a VB.Net app that uses a MS Access 2003 DB along with OLEDB. My problem is that when I insert a record into a specific table, it sticks around for about 1 minute and then completely disappears. How in God's name does that happen? I'm using a DataGridView that is bound to a datasource. The Dataset that was created as a result of the Database I used from my connection string contains 4 datatables, one of which is used as the object of the code below
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Mar 14, 2012
I have a Windows Forms application which uses a tabpage control. On one of the tabpages (TabPage4) there is a checkbox (CompleteCheckBox), and when anybody checks that checkbox, two textboxes next to it have text put into them, and a checkbox[code]...
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Jun 15, 2007
I'm having problems with my VS2005 .Net2.0 VB.Net Windows forms application.When I start the application and work with it for a while it somehow disappears from the taskbar.To get the Application button back on the taskbar I use Alt+Tab to switch to the application and voila,.. the taskbar button is back.In my code and form I can't seem to find anything strange.ShowInTaskbar is set to trueFormborderstule = SizableIt is an MDI application that is used for administrative purposes on sql databases.
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Feb 13, 2010
I have a combobox on my form. It's DropDownStyle is set to DropDownList. As soon as the control has focus and the list opens up, my mouse disappears. What is causing that?
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Jun 28, 2011
Is there any type of msgbox in vb.net that gives a message and disappears automatically after a certain time?
Or is there any method to hide the msgbox, without user's clicking OK?
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Jun 28, 2011
Is there any type of msgbox in vb.net that gives a message and disappears automatically after a certain time? Or is there any method to hide the msgbox, without user's clicking OK?
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Jul 30, 2010
I am working on a web browser with the url bar in a tool strip.I have noticed that whenever I resized it, the textbox stayed the same.
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Jun 18, 2009
This happened to be once awhile ago and I thought I had the solution, but apparently I don't. Very rare, but what happens is, I'll start a new project, build my controls on the form, go into the code window and write some code. I'll save this all out, but when I reload the project, the code window comes up OK, but the design window is just gone. The code for the form and all the controls is still there in the form.designer window, but the form itself just will not appear, and there is no icon for it over in the Solution Explorer to click on
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