Calling A Session Variable In A Class Object In Asp.net?
Aug 29, 2011How can I access the values stored in a session object with a class in asp.net?
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Asp.net - Checking For A Session Variable... Returns (Object Reference Not Set To An Instance Of An Object)
Jan 12, 2011In the Session_Start of the Global.asax i have
Sub Session_Start(ByVal sender As Object, ByVal e As EventArgs)
Session("login") = False
[code]....
Why i am getting error the error Object reference not set to an instance of an object. at line
If Current.Session("login") Is Nothing Then
while checking for the login state as follows?
If GetLogin = False Then
'Do something
End if
I mean i have already created the instance on the Session_Start... Haven't i?
.net - Session Variable In Class Produces NullReferenceException?
Feb 2, 2012I have a class with a subroutine as follows:
Public Sub SetPermissions()
If IsNothing(HttpContext.Current.Session) Then
Exit Sub
Else
[code]....
I know that my session variable is not yet set, hence a null value, that's why i'm trying to handle it with IsNothing, but my code still bugs out on me.
Calling A Method Over Variable Of Type Object In Vb And C#
Jul 5, 2009in vb I can do that
sub SetFocusControl(byref ctl as object)
ctl.Focus
end sub
in c# the compiler complaint that object doesn't have a Focus method
void SetFocusControl(ref object ctl)
{
ctl.Focus();
}
how can I do the same in c#?
Class Inheritance Object Variable Or With Block Variable Not Set?
Sep 26, 2011i had a class called Tag with a structure like:
public class Tag
private _members
public properties
public shared database_methods
end class
this class was tailored for mysql database. i'm currently adding access 2007 support so i split tag into tag and tagdata with structures like:
[Code]...
Calling Class Functions After Declared As An Object?
May 4, 2012I want to see if there is a way to do this... I'm Using vs2010 with the WP7 SDK. (VB.NET)
I am declaring this in the global scope.
public objGame as object then say i have classes: Game1 and Game2 for the sake of the example we'll just say both classes have an Update() function
I want to set objGame = Game1 (or Game2) and then be able to call objGame.Update()
Instantiate Object From Class Using String Variable For Name Of New Object?
Aug 11, 2009dim myCollection as new Specialized.StringCollection
dim myFoundThings as new ArrayList
dim index as Integer
dim newResultMemberName as String
[code]....
This is part of some code that will run without user interaction once it's spinning away, and I need to create a unique object from some items found in a StringCollection, naming the objects using information found in the strings stored in that StringCollection.
Calling Class (When Include Excel Automation) From Button Object
Apr 7, 2011I am messing around with some Excel Automation just to get my feet wet and want to call some specific cells in my spreadsheet just for testing. I have one form in the project including a button. My question is how do I tell the button where to navigate to the cell to be tested?
My code for my Excel class is as follows:
Public Class Waybill
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Dim oExcel As Object = CreateObject("Excel.Application")
Dim oBook As Object = oExcel.Workbooks.Open("C:\TesterXL.xls")
[Code] .....
Use CType To Change An Object Variable "obj" To Custom Class That Reference Using A String Variable Like Obj.GetType.Name?
Feb 9, 2011The code below works for the class that I hard coded "XCCustomers" in my RetrieveIDandName method where I use CType. However, I would like to be able to pass in various classes and property names to get the integer and string LIST returned. For example, in my code below, I would like to also pass in "XCEmployees" to my RetrieveIDandName method. I feel so close... I was hoping someone knew how to use CType where I can pass in the class name as a string variable.
Note, all the other examples I have seen and tried fail because we are using Option Strict On which disallows late binding. That is why I need to use CType.I also studied the "Activator.CreateInstance" code examples to try to get the class reference instance by string name but I was unable to get CType to work with that.When I use obj.GetType.Name or obj.GetType.FullName in place of the "XCCustomers" in CType(obj, XCCustomers)(i)I get the error "Type 'obj.GetType.Name' is not defined" or "Type 'obj.GetType.FullName' is not defined"
'+++++++++++++++++++++++++++++++
Imports DataLaasXC.Business
Imports DataLaasXC.Utilities
[code]....
.net - Create A Variable Of An Instance Object Of A Class At Runtime?
Sep 29, 2011I am trying to create new variables inside a class after creating its object at runtime. The problem is that I don't know the variable names or the value beforehand so I have to create the new variables at runtime.
[Code]...
This is a more elaborate explanation of my code. If you observe that in the Eval function I have tried to evaluate Fval(abc). Now the object array abc is not declared in the Test class because it existence is not known beforehand. What I want to do is create an object array abc of length 2 and populate it with some values and when Fval(abc) is called then then the value of index 1 should be the return value of Eval fucntion.
Session Object Reference Not Set To Instance Of An Object
Jul 28, 2011Object reference not set to an instance of an object.[code]Now I currently have no session set on this page. So the session is NULL but i am just wondering why my if statement is taking care of this problem, why does it even try to get to the next part i.e. Response.Write ?
View 3 RepliesAsp.net - Can't Get Session Variable
Jan 14, 2011Partial 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.
Session Variable Not Being Available?
Jun 5, 2009I have an aspx page with a button, the user clicks the button a session variable gets set, I then read the session variable later. here is an exaple of my button:
<
td style="width: 100px" align="center">
<asp:Button ID="btnCiv" runat="server" Height="32px" Width="50px" Font-Bold="true"
[code].....
Everybody seems to come up empty after the initial setting of data.
Using A Vb Session Variable In Php?
Jul 6, 2011I programmed my website using visual basic code (via microsoft expression web) and need to post information to a remote location using a php page. How do I take variables from my visual basic code and transfer them to my php code? I was thinking sessions would work, but I haven't figured it out yet.
View 7 RepliesAsp.net - Label Using A Session Variable
Oct 10, 2011My vb.net application needs to use a session variable. I don't really know how to use it in ASP.net. I've been trying to use what my books have, but I can't get this label to work. I need the user input to be validated against the database and if their code is in the database, the textbox should disappear and a label will appear saying Welcome. The way I wrote it, I get an error saying the server tag is not well formed and in the codebehind it says that the ID of my label is not declared. Can anyone spot any problems with the code I wrote?
[Code]....
C# - Session Variable For Particular Page / URL
Feb 3, 2011I 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!
View 2 RepliesCan't Get Session Variable To Work?
Feb 14, 2011Sub Authenticate()
Dim username As String
Dim password As String
[code].....
Session Variable Member?
Jun 2, 2009I'm using a compiled .dll provided by someone else -- I know little about it, other than it has a session variable that I must access in a way that is strange to me. Not sure what to call it -- have googled for words that I thought might be right, but so far no success.
View 2 RepliesAsp.net - Way To Do A Logout - Destroy The Session Variable
Mar 3, 2009Here is the situation: User logs in via username/password stored in an MSSQL database If the user is authenticated, the system makes a session variable with username/SHA1'd password and boolean if the user is logged in or not (for subsequent pages) I need to be able to destroy the session variable. I want a confirmation box as well.
This is what I have so far:
<script type="text/javascript">
//<![CDATA[
function doLogout() {
[CODE]...
Since it is an ajax request won't reload the page (the functionality works fine, the request destroys the session), I think I need a different approach to do this. I would really like to be able to do it all in ASP.NET if possible.
C# - Does Session Variable Shared Across Different Browser
May 24, 2012Does session variable shared accross different browser? If not is there away that I can share information accross browser similar to the functionality of caching but the scope is wider.
View 3 RepliesC# - Keep A Session Variable When The User Is Logged In?
May 7, 2009I keep a Session variable when the user is logged in. So that when the user click on btnLogout it must clear all my sessions and Log the User out for GOOD!!!
It does clear my sessions but if i click the BACK button in IE right after i logged out then i am still logged in! Meaning it goes back to screen where the user was still logged into.
My code on log out
protected void btnLogout_Click
{
Session.Clear();
Session.Abandon();
[Code]....
Is there maybe an option in code i can do that will disable the user from pressing the BACK button in the Web Browzer?
Define A Type For Each Session Variable?
Sep 18, 2011Im trying to grasp session varibles, i understand what they are etc but i would like to know how to define a type for each session variable.Iv written it like this
Session("Title") = txtTitleContent.Text
How can i tell it what type of value is going to be in it, because at the moment im only playing about with strings, but what if i have an integer and want to pass it back to the back end to save it will throw an error saying "conversion from string to integer is not valid" should i use Cint to deal with this?
Destroy A Session Variable Set By ASP.NET With Javascript?
Feb 27, 2009As the title states, I have a session variable that is set during a login script with asp.net and vb.net code-behind. Can I call a javascript function when a link is clicked that will destroy that session variable? If it is possible, can I use jQuery to make that process easier?
View 4 RepliesHow To Place Session Variable In VB Insert
Aug 8, 2011I am using VWD 2008 express edition to edit the code below. The HTML Insert Code is as follows: I have no code behind.
<Fields>
Line
24 <asp:TemplateField
HeaderText="RecordID"
SortExpression="RecordID">
[Code] .....
My objective is to populate the DetailsView with a single field in ASP.Net VB, when Inserted, a Record will be created with only a key field.
Session Variable Counter Not Adding On?
Feb 24, 2012I have a master page with the following vb code in the code file...
Public Sub Page_Load(ByVal Sender As Object, ByVal E As EventArgs)
If Not IsPostBack Then
If Session("key") Is Nothing Then
[code]......
Session Variable Is Showing As NULL
Jun 30, 2011I'm using some session variables to store and pass data across several pages of an ASP.Net application. The behavior is a bit unpredictable though. [Code] Ok so far so good, on a normal page load. If the user completes the form action, hits the next page, and decides OH NO, i needed to change field xyz, and clicks back, corrects the data, then submits, the session variable is showing as NULL. Why would a cached session behave this way? I'm not destroying/clearing the variable, unless I fail to understand the scope of session variables.
View 1 RepliesSession Variable Not Taking Effect In Asp.net?
Sep 29, 2011I have a session variable in my asp.net application. The session variable holds a value from the database, that reflects a customized HTML color value.In my application, I have an asp button with server side code
btnContinue.BackColor = System.Drawing.Color.FromName(Session("ContinueColor"))
Issue: However, when I run the application, the color value is not being reflected in the button. I did double check, and the session variable does hold the correct value.There are other objects, that use session variables to display colors, and they are working fine.
Update: When I force a color "btnContinue.BackColor = Drawing.Color.Blue", that works perfectly fine.
When Calling New On An Object - Can The Object Being Created Refer Back To Its Caller
Nov 11, 2010I hope the question makes sense, anyways. I'm looking to know if in VB.NET, when we call an object's constructor, is there some kind of a reference that points back to the caller? I'm interested because of a corner case where I want the object being created to first be able to validate the existence of some data in the caller before it allows itself to be created. If this validation fails, I plan on throwing an exception. This corner case will never happen at runtime unless the object being created is used improperly by a programmer. The object being created is not inheriting the object I want it to validate, so I can't do anything with the MyBase qualifier.
It's bit of a "future-proofing" issue that I have a (bad) habit of doing. Not critical -- I can always leave stern comments behind as a last resort. Wanted to know if this was possible.
.NET Multithreading / Calling Invoke On A UI Control From A Class In A Separate Class File?
May 13, 2011Example:
Two files - TestClass.vb, myForm.vb
TestClass.vb looks as follows:
Imports System.Threading
Public Class TestClass
Private myClassThread As New Thread(AddressOf StartMyClassThread)
[code]....
The result:Application runs, no errors or exceptions.Displayed is the listbox and the Start button.I press the start button and a msgbox says "Not Invoked" as expected and upon clicking OK to that msgbox "Start Button Pressed" is added to the Output listbox control.Immediately following that the msgbox pops up again and says "Not Invoked". I was expecting "Invoked" as a separate thread is trying to use the Output listbox control.Of course this results in the Output.Items.Add being attempted which results in no visible result as the thread is not allowed to directly update the UI control.
Value Of Session Object Go Away
Apr 9, 2010In ASP.NET/VB.NET 2005 I've created a small web app with two forms.
In Default there is a button and a text box and a link.
When you press the button whatever is in the text box is put into the Session. [code]....
