Accessing Public Class Variables In Asp.net Without Session?
Feb 15, 2012
I am using this example I found to learn how to load class files and access variables through them. This is in a file called Class1.vb in the App_Code folder (this is not an app project):
Imports Microsoft.VisualBasic
Public Class my_class
Public Shared Sub my_sub()
[Code]....
How could I access the vartest variable without using a session, since if this is accessed by multiple functions at the same time the variable can be overwritten I assume. Is it possible to go the other way, where a variable is sent to a class file?
I am currently working on a project of "interpreting" C# into VB. The project involves adding images to a database, retrieving images from the database and presenting them in thumbnails. Right now I have the following Public Class with the Variable that needs to be assigned:
I have created a public shared subroutine in a class file in asp.net 2 (vb.net) web site app_folder.The subroutine retrives some values from a sql database via an sql query and assigns the datareader field values to several variables The problem is I can't seem to assign the variables from the subroutine to the variables and textbox controls in the asp.net page I am calling the subroutine from. The textbox text value just appear blank.By the way, if I response.write the variables in the subroutine they appear populated by the sql data reader.
I would love to implement the asp.net routing but i have a basic question.
In my Generic handler i have the following Global class
Public Class MyHandlerRouteHandler : Implements IRouteHandler Public Function GetHttpHandler(requestContext As System.Web.Routing.RequestContext) As System.Web.IHttpHandler Implements
I currently have two forms, and I need to share the value of a variable in one of them.
I declared the variable to be 'Public Shared', and assigned a value to it. However,
when I inspect the value it appears as 'Nothing'. Here is the snippet:
Public Class A Public Shared sVar As String = Nothing Private Sub A_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
I have these list of RS-232 strings declared in my public class Public Class TouchInterface Dim WatchTVbtnCmd As String = "rs232command1" Dim VolUpbtnCmd As String = "rs232command2" Dim VolDownbtnCmd As String = "rs232command3" Dim SystemOffbtnCmd As String = "rs232command4" Dim RadiobtnCmd As String = "rs232command5" Dim MusicbtnCmd As String = "rs232command6"
I then have this private sub. For the sake of this thread, what I would like to do is get the name of the label that was clicked which in the code below is already done, convert it to string (not sure if this needs to be done), this is also done in the code below. Next I want to compare the labelnamestring to all the variables in the public class to find out which one it is equal to and then disply that variable which should be my rs232 string in the message box. I have also added "Cmd" to the variable names above so I also need to work out how to add the text "Cmd" to the string to properly compare.
Private Sub Musicbtn_Click_1(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles WatchTvbtn.Click, VolUpbtn.Click, VolDownbtn.Click, SystemOffbtn.Click, Radiobtn.Click, Musicbtn.Click, GardenVolUpbtn.Click, GardenVolDownbtn.Click, GardenRadiobtn.Click, GardenOffbtn.Click, GardenMusicbtn.Click, GardenMediaCenterbtn.Click Dim labelname As Label = DirectCast(sender, Label) [Code] .....
I'm not sure of the syntax necessary to access a class's attributes inside of a Dictionary declaration.
[Code]...
So if I want to test it and use MsgBox() how do I trickle down to pull, say, name in food > cheese1 > info > attributes2 > name?
EDIT:I just realized that Array in info needs to be a Dictionary for an associative array, so please ignore that error and just assume it is a Dictionary for this question's sake.
I have an ASP.NET application that I am developing. I'm using session variables within the app.In Firefox & Chrome, they all work.But in IE (ver 9), there's one variable that's not working. I'm not sure if it's a storage or a retrieval (or both) at this point. The variable in question that I'm storing is a List(T) type. It's the only one of it's kind that I'm using. Can't help but think there's a correlation there.One other old post mentioned the possibility that cache is causing the problem, but I didn't understand the answer very well.
Dim Rec_IDs As New List(Of String) Rec_IDs = Session("Rec_IDs") and Dim Rec_IDs As New List(Of String)
I am using a sqlDataReader to get data and set it to session variables. The problem is it doesn't want to work with expressions. I can reference any other column in the table, but not the expressions. The SQL does work. The code is below.
I have an ASP.NET 2003 web application. There is a .vb module file within that application. Is there anyway I can pass a session variable into this .vb module from a aspx.vb page?
what is the best way to save variables from one session to the next.when the program starts i want the defaults to be the same but as they are changed in the program the stored value should update.
I loading an array with data from my data base and then putting into a session Variable. I do not get any errors on that code. When I try to put the session Variable back into an array in my .aspx page I receive the following error message: [code]
I'm planning to use some session variables on an intranet ASP/VB.NET page, and want to make sure that I'm not missing out on anything important I should know, or that I have my information mixed up. So here's what I (think) I know about session variables.They:are stored on the server, so if I have a lot of users then they'll each be using some more memory which could lead to a slowdown.are inaccessible by the user unless I expose access. hang around/persist across user requests (i.e. each time the user makes a request from the page the data will still be there - until it times out). This also means that I need to make sure that the variable doens't have "left over" data in it.
Is there anything that I've got totally wrong, or anything I'm missing? I'd prefer not to get bitten by a bug down the road because I think I understand what's going on.
I am trying to create an application similar to a quiz engine. I was wondering if I need session variables to store information between different pages or I can pull the data directly out of textboxes.I am using C-sharp,dot net and WPF.
I have an ASP DataGrid and I'm applying sorting to it. Well, as I was looking at an example, they had a function similar in function, different in name, to[code]...
I am trying to fix an ASP.NET application that is also written is VB and uses session variables to store the information from the logging page. In Firefox, the application runs just fine, but in IE (I am using IE 8), when I summit the logging credentials, the session variables become empty (takes me back to the logging pageThe weird thing is that when I move the privacy settings in IE (doesn't matter if high to low, or low to high) and enter the logging information again, the runs great. Also if I restart IIS 6.0 the application runs great. What's going on?
I've got a problem losing session variables in an ASP/VB.NET application. The application allows searching for an item or it can show an item if provided with a unique link (in the browser). It holds information about the item in session variables. In the webpage showing an Item a user can click a button which opens a window with additional information about the item - obtained from a session variable. When I search for the item using the search engine and click the button - it works OK.
When I copy the link to a browser: the item is shown, however clicking the button returns a 'null exception' - the session variables with information about the item are lost. Moreover when I provide the link for the second time the button works, the variables are there!
I have a gridview and use a session to pass the variables from the page to an edit page. This works perfectly, until you search for a number. When you search the correct record displays in gridview, but when you click edit, it passes the wrong record.
Private Sub gridview1_RowEditing(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.GridViewEditEventArgs) Handles GridView1.RowEditing Session("wr_id") = GridView1.Rows(e.NewEditIndex).Cells(2).Text & "~/~" & _ GridView1.Rows(e.NewEditIndex).Cells(3).Text & "~/~" & _ GridView1.Rows(e.NewEditIndex).Cells(4).Text & "~/~" & _ [Code] .....
I realize not all of the code is pasted in here, because it would take too much space. Any Ideas? I'm guessing it has something to do with e.NewEditIndex
I was thinking about writing some VB 2005 code that would be able to open an excel file and keep it open while I do things in separate functions/subs basically just check boxes, so each check box is its own sub but HOW do I do that with out opening and closing the excel file for every check box sub, since every time I make a check box the sub comes up as private?
I have a web application that allows a user to view family members.
When the user clicks on a family member, it displays the member's basic info. There is also a grid displaying that family member's related family members. (e.g. User can click on the Father link. From that popup, they can then click on the Father's Father link, then click on the Father's Father's Grandson link, etc.).
To reduce the number of popups that appear on the screen, I want to prevent the user from continually clicking on family links past three members.
What is the best way to keep track on how many data forms have popped up? Or can this reliably be done with a web application?
I have an MVC application which sets some session variables based on internal static IP addresses.I have built an ApplicationController to override the OnActionExecuted sub in MVC for data that I need to use throughout my application.However, the code below, which is just a snippet of my code but is edited for my post, only partially works. On initial page load, the session variables aren't saved, but after a page refresh they are. The issue I have is that these need to be saved on the initial page load.
If Session("Item1") = Nothing Then If IpAddressShort <> "" Then Dim locInfo = cmsRepository.GetInfoBasedOnLocation(IpAddressShort).SingleOrDefault() If locInfo IsNot Nothing Then
[code]....
Theoretically, if I'm correct, if there is no Session("Item1") set/if Session("Item1") is empty, then the rest of the snippet should run and set those variables.How come this isn't setting those variables on the first time the page load?
Is there a way to set session variables during login that are then available to reports? We have a reporting services server where we move and denormalize data from our transaction system for reporting purposes. In order to allow our users to login with the same user name and password from the transactional system we have set up custom forms authentication and after much trial and error it is finally working. In addition we have the authorization accessing our transactional system so that any changes in user authority is immediately reflected in Reporting Services.
Our problem now is that we would like to add some additional features such as locking down parameters depending on user authority/groups in our transactional system. We have found a way to do it but it's inefficient, basically we have stored procedures that will query our transactional system to check for access. The problem is that these queries will often be run for every report request even though the answer is unlikely to change. It would be nice to have access to session level data that can be set once during log in and then accessed from the reports.
I have to make a VB project for one of my college Co-Sci classes. However, I am having issues doing what I think is logically possible. Part of our project entails creating a user defined class, then create a form that then instantiates an instance of the object type. After that we are to list the item in a listbox. That is all well and good and works fine.
What I need help with is looping through each object in the listbox, getting some data from the object, then moving to the next.
I have been trying something similar to c++. For example, an object contained in a c++ array can be accessed like this:
array[index].someObjectMethod().
How would someone do something similar to that for objects contained in a VB listbox? I imagine it starts something like this:
In my Site.Master.vb file, I have a custom User object:[code]Now in one of the content pages, I want to be able to see if a user is logged in. I figured if the object u was declared in the Site Master, I could use it in the pages that derive from the Site Master. For example, I want to do:[code]
I define some global variables of a class as follows:
Private Class MyClass Private var1 as Decimal Private list1 as List(Of string)[code].....
But I found that after this form is closed, all above variables, var1, list1, list2 still exist in memory. I thought they should be collected by gc since the form is already disposed as I confirmed.
Add: I have monitored half an hour after the form is closed. But these variables are not collected by gc. I have an automatic update procedure on the form which uses above variables.Since the above variables still hold values, the automatic update procedure is always called which causes exception. (One quick fix is to check if form.isDisposed in update procedure. But I do not think this is elegeant. Besides, these variables occupy memory.)
