Web Forms :: Access Page Object Reference In Class?
May 27, 2012I am trying to develop logic to add dynamic controls to page via class method. So I want to know how can we access the ASP.Net Page object reference in class method.
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Web Forms :: Object Reference Not Set To An Instance Of An Object Error When Remove Reference To Site Master Page
Sep 30, 2010in my default.aspx page i have a dropdown List and a textbox with a submit button below that there are 2 listbox... and the dropdown list holds the names of the listbox
my logic here is to select an item from the dropdown list and put some text in the text box and submit the form which will add an item to the listbox selected.. but when i do this i get an error saying Object reference not set to an instance of an object. i tried to figure out the problem and found that when i remove the reference to the Site Master Page it works fine and when i undo and apply my reference back to the Site Master Page i get the same error.
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Forms Data Controls :: Cannot Access Header Row Error / Object Reference Not Set To An Instance Of An Object
Jul 2, 2010I tried to get the heade row text with the following code, but it failed.
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Error returned was "Object reference not set to an instance of an object." on this line:
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Forms Data Controls :: How To Access A LinkButton Inside A Repeater/Object Reference Not Set To An Instance Of An Object
Jan 16, 2010why I get this error:
Object reference not set to an instance of an object.
when I try to access a LinkButton inside a Repeater as follows:
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C# - Access To An Object Created In Page From A Class?
Jan 18, 2010I have a page, Default.aspx, with its own code-behind file like this:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
public partial class _Default : System.Web.UI.Page
{
public int[] anArray;
}
What I'd like to do is access to "anArray" from a C# class (not tied to a page) declared in App_Code folder. What can I do?
Edit: As said in the first comment, I really apreciate your about refactoring my connection objects. However, what I'm really doing here is to rewrite an old PHP application in order to get comfortable with basic C# and ASP.NET, so this code will never go really live. So, I'm still intersted in a way (if any) to access an object declared in a code-behind code from a standard C# class.
Edit2: I removed the OdbcConnection object in order to focus to the real problem: how to refer to an object istantiated in a code-behind file from a C# class situated in App_Code?
Web Forms :: "object Reference Not Set To An Instance Of An Object" Error When Access The Dynamic Control
Nov 25, 2010I got this error "object reference not set to an instance of an object" when i want to display the values of dynamic generated drop down lists by pressing a button to show the values in Listitem.
i have master page in which i use :
1)ScriptManger
2)UpdatePanel
3) treeview menu
Server side Code is:
[code]
Web Forms :: Error When Using A BasePage Along With A Master Page/ Object Reference Not Set To An Instance Of An Object
Mar 6, 2010I'm new to programming in ASP.NET, but I'm making my way through Wrox's Beginning ASP.NET 3.5 in C# and VB.NET.
I'm at a section where I'm creating a BasePage. I successfully created a BasePage by creating a new class file in my App_Code folder called BasePage.cs with the following code:
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If I run that code everything works out fine. The page loads and all is well. But, if I try to do the same thing to a page that uses my MasterPage.master file, I get the following error:
Object reference not set to an instance of an object.
Description:
An unhandled exception occurred during the execution of the current web request. review the stack trace for more information about the error and where it originated in the code.
Exception Details: System.NullReferenceException: Object reference not set to an instance of an object.
Why is that? In the example code from the book (that also uses a MasterPage.master file), everything excutes and runs just fine. But in my test, I get the above error. I've tried comparing my pages to the books included source pages, but I can't find any differences.
Web Forms :: RadioButton In Page - Object Reference Not Set To Instance Of Object
May 7, 2015I use radiobutton in my page
<asp:RadioButtonList ID="RBLType" runat="server" RepeatDirection="Horizontal" TextAlign="right"
CssClass="Drbgalary">
<asp:ListItem Value="دارای گالری" Text="دارای گالری"><span style="color:#676767">دارای گالری</span></asp:ListItem>
<asp:ListItem Value="دارای محصول" Text="دارای محصول"><span style="color:Red">دارای محصول</span></asp:ListItem>
</asp:RadioButtonList>
[code]....
but I run page below error happen.Object reference not set to an instance of an object.An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code. Exception Details: System.NullReferenceException: Object reference not set to an instance of an object. Source Error:
Line 91: if (_dr["storetype"].ToString().Trim() == "دارای محصول")Line 92: {
Line 93: RBLType.Items.FindByText("دارای محصول").Selected = true;Line 94: }
Line 95: else {
Why Use Reference Of Abstract Class To Create Object
Jul 22, 2010Why do we use the reference of abstract class (or base class) to create object of it's sub-class. eg: TextWriter is the abstract class for StreamWriter & StreamWriter.
TextWriter writer = new StreamWriter();
why can't we simply use :
StreamWriter writer = new StreamWriter();
Web Forms :: Master Page Control In Child Page Error "Object Reference Not Set To An Instance Of An Object"
Aug 31, 2010i have create dynamic menu control , i have master page and login page , once the user login , i want to show the dynamic menu in my master page. below i try to call masterpage control in my child page ,but i throughs the error
Object reference not set to an instance of an object.
my master page code
public partial class MasterPage : System.Web.UI.MasterPage
{
protected void Page_Load(object sender, EventArgs e)
{
}
public string MyProperty
{
set
{
// lblUser.Text = value;
lblUser.Text = value; // here i got the error
}
}
}
My child page code
protected void btnwork_Click(object sender, EventArgs e)
{
((MasterPage)this.Master).MyProperty = "Text changed from Sub Page";
}
Intellisense/Reference To Static Class Object Lost
Jul 21, 2010We have a Static class that 's called CData in our asp.net c# app.It handles all the data layer CRUD functionality on our pages.
Problem is, were are losing the intellisense reference in our pages to it.For example: we would expect to type CData.(dot) and have a list of methods and properties available to us.
Nope. Not there.
I kind of thought it was because the file was getting too long at 3000 lines of code, since some other static classes were working ok.
So then I thought that I'd try wrapping the CData Class in a namespace. That worked, but of course I had to put an include statement of the top of each page that's using CDATA, also, now some of the other developers are getting errors in there pages complaining about missing methods that are in CDATA, but their pages are not seeing.
Get A Reference To The Current Class (ascx Or Aspx) Given A Member Object?
Mar 14, 2011Given an instance of a control SomeControl that is in a some file (could be a usercontrol/ascx, or an aspx) how can I get a reference to the class to which it belongs?
In a usercontrol, SomeControl.NamingContainer seems to be reliable.
In a page that inherits from a MasterPage, this will return a reference to the ContentPlaceHolder, not the actual class that defines the aspx. What I would want in that case is SomeControl.Page
Parent will return the parent control in the heirarchy so isn't much use.
Is there any method for getting this directly regardless of what kind of thing it is?
Web Forms :: Gridview, Paging And Object Reference Not Set; Error - Object Reference Not Set
Jan 21, 2010I am using grid view as mentioned below, it is giving me error "object reference not set", but if comment allowpaging and pagesize lines, it works. let me know whats wrong I am doing?
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C# - Access The Login Control Error "Object Reference Not Set To An Instance Of An Object"
Mar 24, 2011I'm working on ASP.NET app and in the master page C# code I want to access the login control, so I have the following code:
Login login = new Login();
login = this.Master.FindControl("login") as Login;
But, I get exception "Object reference not set to an instance of an object" when this line
login = this.Master.FindControl("login") as Login;
is executed. I can't see what can be wrong...
Page.User.Identity.IsAuthenticated Returns Object Reference Not Set To Instance Of Object?
Dec 23, 2010this works fine on my local site but as soon as i upload the site to my live server i get stem.NullReferenceException: Object reference not set to an instance of an object
on the first line of this:
if (!Page.User.Identity.IsAuthenticated)
{
pnlSignIn.Visible = true;
pnlSignOut.Visible = false;
}
Object Reference - Get An Object Ref Error Show Class Name With Error?
Jan 24, 2011When I get an Object Ref error, it can sometimes be a real pain to find out which variable is causing the error (when you can't debug). Is there a way for this error to throw the classname that isn't assigned?
View 2 RepliesWeb Forms :: Usercontrol Reference To Page Object?
Apr 20, 2010I am developing a usercontrol, in this case a toolbar. Some of the buttons on the toolbar will interact with other objects on the page which are not part of the toolbar. (In this case a map) So the toolbar code behind wants to say something like this:
[code]....
My problem is that MyMap does not exist in the design environment of the usercontrol and therefore produces an error when it is referenced. So my question is, How is this typically handled? Can the usercontrol reference another control that does not exist within itself?
Web Forms :: How To Reference A Object On Another Aspx Page
Oct 26, 2010I have a basic ASP.NET (4.0) web site (in VS2010)
I have a few aspx forms with in it..
on default.aspx I have a aspxbutton1
on report.aspx I have a aspxlabel
All I need to know is HOW do I reverence the label from the default page and visa versa..
In the web world things are not the same.. This is just an example .. to prove the point.. but I am trying to copy the settings from one object on page 1 to an object on page2.
Web Forms :: How To Reference A Master Page Control From A Static Class
Feb 15, 2011my MasterPage I have a label that reflects the name of the module that the user is currently in. I change the label text accordingly using the following ..
private void ChangePageTitle(string PageTitle)
{
Label lblPageTitle = (Label)Master.FindControl("lblPageTitle");
lblPageTitle.Text = PageTitle;
}
Instead of placing this method in the code-behind of every page, I want to put it in a single class and call it accordingly. I thought of using a static class but do not know how to reference the MasterPage.Can I use a static class? or do I place the method in the code-behind of one page and call Object.Method from the other pages?
C# - Application Object Access From Regular Class?
Mar 25, 2011store our DAO objects in the Application object, so there's one object of each available for the whole application.
This Application object is easily accessed in the Page codebehind itself, but how do we access it from a plain class that is not extending anything?
Web Forms :: How To Avoid Null Object Reference Page Load
Nov 18, 2010I have a user control with GridView. GridView template has label that suppose to get custom object value Name.
aspx:
<asp:Label ID="lblImage" runat="server" Text='<%# MyData.Name%>' />
cs:
public MyObject MyData;
During page loading MyData object is null, so I'm getting exception: "Object reference not set to an instance of an object.".
How to avoid the error?
Forms Data Controls :: Unable To Access Label Inside Repeater - "Object Reference Not Set..."?
Aug 27, 2010I have a button on a page with a Repeater and an ObjectDataSource. To give credit where credit is due, the Repeater's paging functionality is courtesy of ScottGu. (However, I'm using ASP.NET 4.0 and SQL Server 2008, as opposed to ASP.NET 2.0 and SQL Server 2005.)
Anyway, in the button's click event, I need to access the Text property of a Label that's inside the Repeater because it's used as an input parameter in a stored procedure. I'm getting a NullReferenceException when trying to access the Label's Text property. I have researched this error and have tried a few different solutions (involving FindControl and the Repeater's ItemDataBound event), but I haven't been able to get it to work. The code is below.
somepage.aspx
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How To Access Session Object Outside The Web Project (class Library)
Oct 29, 2010I am implementing a custom membership and role providers where I need to store all the role/membership information in the user's session.
I am implementing these custom providers inside a class library project (different from the website project) and need to access the session in them. The idea is to store the role/membership related information in the session after retrieving them for the first time from the database.
When I try to access the Session using System.Web.HttpContext.Current.Session
I get this as a null object (Object reference not set to an instance of an object.
Why is the session turning out to be null?
Class Access Session Object But Not When Deploying It To Server?
Mar 16, 2011I have a custom MembershipProvider that I'm using in an ASP.NET 2.0 application. Inside of the class that extends membership provider, I have a function called AttemptLogin() that sets session variables if the user is valid. Inside that function, are a number of session variable assignments similar to the following:
HttpContext.Current.Session["id"] = "12345";
AttemptLogin() is being called by the Application_BeginRequest function in global.asax. This code works fine when I open it in visual studio, and then run it in the built-in development server by clicking "Start Debugging". However, when I deploy it to our testing server (Windows 2003 Server 64-bit running IIS in 32-bit mode), execution breaks when it reaches the code above, giving me the following message:
[NullReferenceException: Object reference not set to an instance of an object.]
CustomMembershipProvider.AttemptLogin() in c:InetpubwwwrootJoshApp_CodeCustomMembershipProvider.cs:1097
ASP.global_asax.Application_BeginRequest(Object sender, EventArgs e) in c:InetpubwwwrootJoshGlobal.asax:14
System.Web.SyncEventExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +68
System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +75
How can I access the session state successfully in this situation? Why does it work locally and not on the server?
State Management :: Cant Access Object Property In Class?
Mar 28, 2010I'm having a problem with a class library I'm building. I have a class called Users and inside this class I have a property called UserInfo that is an object. Both of the classes Users and UserInfo are built using MyGenerations dOOdads. When I create an object instance of the Users class I am able to access the UserInfo property without a problem in my Windows App, however when I using the same library in a website the UserInfo property continues to return a no reference error. Like I said when running it in a WinApp I have no problems at all, I can access the UserInfo property and likewise all of UserInfo's properties. I am also having problems trying to debug the library using the website. And again I have no problems when using the WinApp. The way I've set it up is I have the Class library project open, and then I add the WinApp project and then the website project. When I set the WinApp as the startup project and run it I have no problems, I can set breakpoints and step through the code no problem. But when I set the Website as the startup project and try to debug I get a massage saying the breakpoint won't be hit. I then do what it tells me and right click on the breakpoint and set the location to allow the source to be different. This lets me hit the breakpoint, but every time I hit F10 to step I get "There is no source code available for the current location." For every step I take. This is making it really hard for me to figure out what going on with the code in the website. Sorry for the lengthy explanation. Here's the Users class, again it works great in the WinApp, just not the website.
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