MVC Null Reference Exception With TextArea Name?
Apr 29, 2010
I have a TextArea html helper method I'm calling in a foreach loop. Basically, when I initially load the View it works fine, but when i reload the View and load postback data, the same TextArea throws a NullReferencException and yet the variable I'm using in the TextArea as the name of the TextArea is not null. I've attached a picture below for demonstration:
if it's difficult to see, the blue arrow below is pointing to the variable used to name the TextArea. Again, it works on initial load, but it errors out on postback when the page is reloaded. I'm not sure what's going on.
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Sep 1, 2010
I'm getting a null reference exception whenever I try to databind this datatable to the Gridview. I know for sure that the datatable has data. I've checked it.
[Code]....
I get the error when it gets to the last line here..
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Jul 15, 2010
I am getting this exception even though no values to my knowledge are null, apart from the model.SuburbID itself.
Here is controller code for getting the suburbs:
[Code]....
Here is the view code:
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Jan 19, 2010
My controller calls a class in my model which is getting data from a REST web service. The class in the model then passes the data back to the controller using an IList, like so:
[Code]....
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Dec 6, 2010
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[Code]....
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Jun 30, 2010
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Jul 10, 2010
I have created a masterpage where I require user login. The content pages are only displayed if the user is authenticated.
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Dec 10, 2010
I am getting the Null reference exception in
[Code]....
also when I used the Quickwatch, I get this error message.
getElementById The name 'getElementById' does not exist in the current context
I am also using Master Pages.
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Nov 13, 2010
i get a null reference exception for this code.//was trying to retrieve cookie, who's name is attached as query string.
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Jul 9, 2012
This is my button event code
protected void ImageButton2_Click1(object sender, ImageClickEventArgs e)
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Dec 15, 2010
let me see if I can explain this clearly. I have a gridview control
and I am trying to use the Edit function. In my gridview, there are numerous rows. I pick one to change and click Edit. I then see the boss name in my gridview and click "Change". When I click Change, I'm expecting two fields to appear, one is a label, the other is a DropDownList. I get this error when I click:
System.NullReferenceException was unhandled by user code
Message=Object reference not set to an instance of an object.
Source=App_Web_lzmklgbg
StackTrace:
at Training_TRManageOrg.LinkButton1_Click(Object sender, EventArgs e) in d:projectsediting.aspx.cs:line 108
at System.Web.UI.WebControls.LinkButton.OnClick(EventArgs e)
at System.Web.UI.WebControls.LinkButton.RaisePostBackEvent(String eventArgument)
at System.Web.UI.WebControls.LinkButton.System.Web.UI.IPostBackEventHandler.RaisePostBackEvent(String eventArgument)
at System.Web.UI.Page.RaisePostBackEvent(IPostBackEventHandler sourceControl, String eventArgument)
at System.Web.UI.Page.RaisePostBackEvent(NameValueCollection postData)
at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)
InnerException:
Gridview HTML:
<asp:TemplateField HeaderText="Director">
<EditItemTemplate>
<asp:Label ID="Label1" runat="server" Text='<%# Bind("director") %>'></asp:Label>
<asp:LinkButton ID="LinkButton1" runat="server" OnClick="LinkButton1_Click">Change</asp:LinkButton>
<asp:Label ID="Label4" runat="server" Text="Director" Visible="False"></asp:Label>
-
<asp:DropDownList ID="DropDownList2" runat="server" DataSourceID="trDirector"
DataTextField="name" DataValueField="id" onselectedindexchanged="DropDownList2_SelectedIndexChanged"
Visible="False"></asp:DropDownList>
</EditItemTemplate>
<ItemTemplate>
<asp:Label ID="Label1" runat="server" Text='<%# Bind("director") %>'></asp:Label>
</ItemTemplate>
</asp:TemplateField>
Code Behind:
protected void LinkButton1_Click(object sender, EventArgs e)
{
DropDownList DropDownList1 = ((DropDownList)FindControl("DropDownList1"));
DropDownList1.Visible = true; // this line is where the exception occurs
Label3.Visible = true;
}
I figure I must be overlooking something so I'm asking what am I missing?
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Oct 19, 2010
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I tried to acced the usercontrol in Databind method of ListView , it is accessible here but viewstate is empty at this point, i saved the value in viewstate in SelectMethod of objectDatasource but i cant access viewstate in ListView Databind. Its empty. Its a simple code and no rewriting to viewstate elsewhere.
Important: My Codebehind files are in a seperate project and .ascx files in seperate project
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Aug 20, 2010
I developed a page in VWD 2008 and it works perfectly locally, but when I deployed it on the server every Page.FindControl() call is causing the NullReference Exception "Object reference not set to an instance of an object. " Can anyone help me out? Code is below
[Code]....
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Mar 8, 2010
I' m using a web custom control to upload images and mark them as primary. all the flow is working fine but it fails to mark images as primary in a diffrent category(there are four categories in which we can load a image-,catalog,primary,misc).It works in - category but not in others when I debug it is failing at a condition in grey . If it is not an element of the Datalist item it would not even enter the loop. I' m lost and unable to find the reason.
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Sep 2, 2010
Null Reference Exception was not handled by user Object Reference not set to instance of an object
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May 19, 2010
i have null reference exception in grid view, in the
string s = ((Label)GridView1.FindControl("Label6")).Text;
i tryed this to e.Values["EventId"].ToString()
but still the some why is that?
the full code :
[Code]....
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Feb 16, 2010
I have a class that derives from System.Web.UI.Page and have set my pages to derive from this custom page class instead of Page. At runtime, the controls are never initialized and throw a NullReferenceException. I've changed some class names and namespaces in the pasted code to protect the innocent. The only thing that I currently override in my PageBase is OnPreLoad and I do call the base.OnPreLoad. I'll eventually add more functionality to this PageBase but for now all that it has is this:
[Code]....
I've tried putting this into a class library (with System.Web referenced) and I've also tried moving the class into the web application and had the same results either way. As another strange twist, I have another class with derives from PageBase called IndexPageBase and it doesn't have this problem:
[Code]....
[Code]....
[Code]....
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Aug 6, 2010
I am trying to call web reference "A" in an application.
The web reference "A" will then call a function in another web reference "B" through HTTPS connection (require certificate).
Then I keep getting the following error:
An unhandled exception of type 'System.Web.Services.Protocols.SoapException' occurred in System.Web.Services.dll
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Feb 24, 2010
I am using dropdownlist in my view page with some values which will display corresponding ID(primary key of other table) in my database.If i leave my dropdownlist blank and save it in database then its showing null parameter error. Can you explain how to use this reference type to overcome this error
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Jul 15, 2010
I'm working with an MVC1.0 web app and I've found a bit of an odd anomaly.
I have a search box on the first page (normal text box) and the input from this is passed through to the ViewData and on to the second page.
On the second page, I render a TextArea with this search input text from the ViewData.
Eg:
[Code]....
The problem is, there is an extra line break in the TextArea, just above the original text.
Stranger still is that if I now submit this page and the view is reloaded (after validation fails) - the original string of text has been trimmed and has no line breaks, but the TextArea now has 2 line breaks above the original text.
This can be repeated - every time the page reloads it has another line break.
It's driving me insane - does anyone have an idea on how to fix this?
FYI, you can check it out yourself - on your mobile phone, browse to [URL], punch something in the search box and hit search. You'll notice one line break added the first time the page loads. Then just hit "Find Best Offer" without entering a budget or selecting a category, and you'll see what I mean about the additional line breaks.
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Sep 23, 2010
Im trying to resize an image. I have the original file and then try to resize it and save it to a new image.However, I get an exception because the value of stream cannot be null. This makes sense, but I dont know how to prevent it:
Value cannot be null.
Parameter name: stream
Description: An unhandled exception occurred during the execution of the current web request.
Source Error:
[Code]....
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Apr 8, 2010
This is probably something silly I'm missing but I'm definitely lost. I'm using .NET 4 RC and VS 2010. This is also my first attempt to use UpdateModel in .NET 4, but every time I call it, I get an exception saying Value cannont be null or empty. I've got a simple ViewModel called LogOnModel:
[Code]....
My view uses the new strongly typed helpers in MVC2 to generate a textbox for username and one for the password. When I look at FormCollection in my controller method, I see values for both coming through.
And last but not least, here's are post controller methods:
[Code]....
why UpdateModel would be throwing this exception?
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Apr 16, 2010
I have an ASMX web service running under IIS7 in classic mode. This service has the following code:
try
{
env.ExternalIP = HttpContext.Current.Request.ServerVariables["REMOTE_ADDR"];
}
catch (Exception ex)[code]....
This results in the following stack trace. I only modified the names of usercode call stack here to protect the innocent:
Message: An Exception of type: NullReferenceException occured in method: GetAdditionalServerVar
ExceptionMsg: Object reference not set to an instance of an object.
===Stack Trace===
at System.Web.Hosting.ISAPIWorkerRequestInProc.GetAdditionalServerVar(Int32 index)
at System.Web.Hosting.ISAPIWorkerRequestInProc.GetServerVariable(String name)
I'm at a loss here as this is very basic plain vanilla code.
EDIT.This gets even stranger. I have added some basic code just wondering what server variables I can get at this point. This fails with the same exception when I try and get all the keys:
System.NullReferenceException: Object
reference not set to an instance of an
object. at[code]....
When I was looking at the framework code looks like this could happen when the array which caches the server variables isn't populated and it looks like this occurs when there a null pointer to some Context...which seems like a fairly core piece of the framework code.
I suppose it's time to burn up one of our support tickets with Microsoft.
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Mar 16, 2011
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
i have 1 dropdownlist which contains shiftcode & shift decription. where shift code is datavalue filed and desc is dat text field. ddl is conected to sql datasource.
i am getting this error:
Object reference not set to an instance of an object.
[Code]....
Source File: C:srcAicWappPersonnelShiftTime.aspx.vb Line: 33 Stack Trace:
[Code]....
here is my code..
[code]....
[Code]....
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Nov 3, 2010
For a Table A defined in the DB like this:
A :{ id, selfId, name,} where selfId is a foreign key refered to Table A itself.
I generated the Entity automatically like this:
A :{ string id; A self; string name,} when i update the entity in gridview Edit/Update CommandField
i got the exception:
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. Source Error:
[Code]....
Stack Trace:
[Code]....
I guess maybe this is caused by:
A is to be updated, and when the EntityDataSource construct the new A, the reference "self" is invalid at that moment. I do not want to modify my DB structure and do not want to lose the self reference, The event EntityDataSource_Updating is not triggered while the exception hit. so i can not access my entity at any time. Maybe the worst idea is deal the whole Update Procedure myself. However, is there any better workaround?
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