Web Forms :: NullReferenceException On List Add

Mar 4, 2010

I am getting a NullReferenceException thrown when trying to add to theList object. Clueless at this point about how to solve.

[Code]....

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As a test, my boss asked me to convert a (not very critical) ASP.NET site from 1.1 to 4.0. Well, it's not extremely difficult and things are going well so far. However, I've hit a small snag. I keep getting a NullReferenceException when I run this code:

[Code]...

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i hav e1 drop down list where is is to filter shif code , ddl text field contaoins shift desc and value contains shift code.

when i select particular shift description it has to show all the 7 days shift description on text boxes iam using informix database

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[Code]....

Source File: C:srcAicWappPersonnelShiftTime.aspx.vb Line: 33 Stack Trace:

[Code]....

here is my code..

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[Code]....

The Source Code of the File is:

[Code]....

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When I submit invalid data to test my form validation I get a NullReferenceException on the folloing line of code in my view:

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I can't seem to find anything that's null.assessment.AssessmentDescr is populated with the expected string.assessment.Score is populated with the value 0.Any ideas as to what might be causing the NullReferenceException? Seems to me that Html.TextBox has everything it nees to render the TextBox.

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I followed the directions from MSDN on transferring data between asp.net pages.But when using the 'PreviousPage' property to access the previous pages controls, I get a null ref exception that PreviousPage is not set to an instance of an object.Here is my code:

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[code]...

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we have an MVC app that is after some time getting to some kind of bad state. I found only a couple of posts with a similar error message and they pointed to not changing up the routing table (after appstart). However this app doesn't mess with the routing table after appstart so that would appear not to be the cause of our problem. Recycling the app makes the error go away... for a time. Got 3 sites (all running of the same codebase) that this is effecting.

Just incase I'm doing something naughty in my application class heres a bit of source:

[Code]....

And the class that inherits from: [Code]....

Stack trace follows:[NullReferenceException: Object reference not set to an instance of an object.]
System.Web.Routing.RouteCollection.GetVirtualPath(RequestContext requestContext, RouteValueDictionary values) +97

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I'm trying to call a dataadapter funtion to pass browser information to a database table upon logged in. I have also tried not assigning the function to an interget by setting the fucntion to not return a value. However in either case I get the System NullReferenceException.

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I have some inline code in an aspx file that executes:

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Does the following code below look right?

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Code:

[code]....

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When I click on my btnMissionary_Click which is suppose to add a datatable row I am getting the following error:

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Here is my form
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[code].....

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Nov 12, 2010

Since I upgraded from MVC 2 to MVC 3 RC, using TryUpdateModel causes a NullReferenceException. This problem only occurs when running my action method as part of a unit test. Running it on the actual server works as expected. Here's a stack trace of the exception:

System.NullReferenceException: Object reference not set to an instance of an object. at System.Web.Mvc.JsonValueProviderFactory.GetValueProvider(ControllerContext controllerContext) at System.Web.Mvc.ValueProviderFactoryCollection.<>c_DisplayClassc.b_7(ValueProviderFactory
factory) at System.Linq.Enumerable.WhereSelectEnumerableIterator[Code]....
2.MoveNext()
at
System.Collections.Generic.List[Code]....
1
collection) at
System.Linq.Enumerable.ToList[TSource](IEnumerable`1
source) at
System.Web.Mvc.ValueProviderFactoryCollection.GetValueProvider(ControllerContext
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... my own code from here on....

In case it matters, my controller has the following signature:

[Code]....

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Feb 16, 2010

I am getting an exception like"NullReferenceException was unhandled by usercode-Object reference not set to an instance of an object." in (IEnumerable)Viewdata.Model.

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Oct 26, 2010

This is what I'm trying to run:

[Code]....

When I browse to www.mysite.com/mycontroller/myaction/myid, everything works ok. But visiting www.mysite.com/mycontroller/myaction produces:Server Error in '/' Application.Object reference not set to an instance of an object.Description: 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.

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I got a master page with a server control in it. Randomly the server control is inaccessible from codebehind. This doesn't happen on a specific action (eg a Button click or so). Currently I have no clue what this could be. I don't think it's output caching since this is not explcitly activated and the error happens far to seldom for that. But I'm going to disable caching in the master page explicitly with next deployment.

The control is defined in markup. The accompaning codebehind is:

PGFMainNavi.HasAccessToFunction = HasAccessToNaviItem;
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System.NullReferenceException: Object reference not set to an instance of an object

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Mar 28, 2011

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[Code]....

The only thing I can think of is that pageType is null when it's being used as a dictionary key, but apparently that is not possible.

The code that calls it is simple:

protected override void OnLoad(EventArgs e)
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I also thought that the error might be with the _section.Pages, but section is never null and never sets anything. If .Pages[page] returns null, the MyPage constructor simply returns. So what am I missing?

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Jul 9, 2012

I am trying to get rid of the IE added header and footer such as Page Title, Page 1 of 1, Url, Etc..

I am using the following code. My goal is when a user click on the PRINT button within my application, I would call SetIEON, print the page and SetIEOff.

However, when my code gets to SetIEOn at

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See code below.

'Removing the header and footer in the Windows Registry

Public Sub SetIEOn()
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[Code] ...

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Crystal Reports :: CrystalReportViewer.ReuseParameterValuesOnRefresh Throws NullReferenceException

Feb 10, 2010

I am installing a website that uses CrystalReport to display reports on a customer's server. When trying to display a report I got an error at the following line:

<CR:CrystalReportViewer runat="server" AutoDataBind="True" EnableDatabaseLogonPrompt="False" EnableParameterPrompt="False" ReuseParameterValuesOnRefresh="True" DisplayGroupTree="False" .... />Error:
[NullReferenceException: Object reference not set to an instance of an object.]
CrystalDecisions.Web.CrystalReportViewerBase.set_ReuseParameterValuesOnRefresh(Boolean value) +28
ASP.memberpages_MyPage_aspx.__BuildControlCrystalReportVPI() in d:Web_apldomainMemberPagesMyPage.aspx:10
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ASP.memberpages_MyPage_aspx.__BuildControlContent(Control __ctrl) in d:Web_apldomainMemberPagesMyPage.aspx:8
System.Web.UI.CompiledTemplateBuilder.InstantiateIn(Control container) +12
ASP.memberpages_sitetemplate_master.__BuildControlSiteTemplate_Content() in d:Web_apldomainMemberPagesSiteTemplate.master:90
ASP.memberpages_sitetemplate_master.__BuildControlSiteTemplateForm() in d:Web_apldomainMemberPagesSiteTemplate.master:39
ASP.memberpages_sitetemplate_master.__BuildControlTree(memberpages_sitetemplate_master __ctrl) in d:Web_apldomainMemberPagesSiteTemplate.master:1
ASP.memberpages_sitetemplate_master.FrameworkInitialize() in d:Web_apldomainMemberPagesSiteTemplate.master.cs:912307
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System.Web.UI.MasterPage.CreateMaster(TemplateControl owner, HttpContext context, VirtualPath masterPageFile, IDictionary contentTemplateCollection) +1978576
System.Web.UI.Page.get_Master() +48
System.Web.UI.Page.ApplyMasterPage() +18
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +543
I tried to set the same attributers programmatically in the Page_Load event:
protected void Page_PreInit(object sender, EventArgs e)
{
CrystalReportVPI.AutoDataBind = true;
CrystalReportVPI.EnableDatabaseLogonPrompt = false;
CrystalReportVPI.EnableParameterPrompt = false;
CrystalReportVPI.ReuseParameterValuesOnRefresh = true;
...
}

Here the NullReferenceException is thrown only in the »CrystalReportVPI.ReuseParameterValuesOnRefresh = true;« line. The same page runs on another customer's server with no errors. The server's environment is: Windows Server 2000 CRRedist2005_x86.msi dotnetfx.exe 2.0.50727.42 Has anyone encountered problems like this? Any idea how to solve it? I already searched for answers on different forums with no result.

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I am getting a "System.NullReferenceException" when I call

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Apr 9, 2010

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[NullReferenceException: Object reference not set to an instance of an object.]
STPIntranet.MvcApplication.Session_Start() in C:Documents and SettingscsallemiMy DocumentsVisual Studio 2008Projects<ProjectName>Global.asax.cs:50
[TargetInvocationException: Exception has been thrown by the target of an invocation.]
System.RuntimeMethodHandle._InvokeMethodFast(Object target, Object[] arguments, SignatureStruct& sig, MethodAttributes methodAttributes, RuntimeTypeHandle typeOwner) +0
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System.Web.AsyncEventExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +66
System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +155

It is failed in my Global.asax.cs file where I try to populate a custom User object (has a username and email property). In line 50 where the error is occuring I make a call to a class called SecurityUtil to get the username from WindowsIdentity.GetCurrent() and then get the email by making a call into our active directory. I almost want to say that the necessary libraries are not getting added in either my project dll or web.config file because of the null pointer. Also, the error line is point to my local file structure (C:Documents and SettingscsallemiMy DocumentsVisual Studio 2008Projects) and not the file structure residing on my iis 6.0 machine.

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I am getting a NullReferenceException when the following code is executed. I have also noticed that the nested table appeared on a new page when I added in the code that wrote cells to the main table. It doesn't occur if I take out the two loops that write cells to the main table.

<%@ Page Title="" Language="C#" MasterPageFile="~/Main.master" %>
<%@ Import Namespace="iTextSharp.text" %>
<%@ Import Namespace="iTextSharp.text.pdf" %>
<%@ Import Namespace="System.IO" %>
<script runat="server">
protected void Page_Load(object sender, EventArgs e)
{
Document doc = new Document(PageSize.LETTER);
// Here is some stuff needed to put the pdf into the users response stream

[Code]....

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May 13, 2010

I have written a basic ASP.NET user control. It looks like this:

<asp:ScriptManagerProxy ID="ScriptManagerProxy1" runat="server">
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<asp:UpdatePanel ID="UpdatePanel1" runat="server" >

[code]...

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