Web Forms :: Error / Different Object With Same Identifier Value Was Already Associated With Session
May 7, 2015what is this error and how to solve
a different object with the same identifier value was already associated with the session:Â
Similar Messages:
Web Forms :: Session Ended - But Server Error/ Object Reference Not Set To An Instance Of Object?
Nov 15, 2010In the VS2005 environment, when I test my session to make sure the page redirects to the main page (itself) if the session is null, it works. There is no error.
The function I use for this is:
[code]....
However, when it is in the production environment in IIS 6.0, when the session has timed out, and I then do a postback by doing some slider control, I see the page reload but immediately thereafter, it throws a Server Error exception of : Object reference not set to an instance of object.
Looking at the stack trace, the event occured:
AJAXEnabledWebApplication1._Default.Slider1_TextChanged(Object sender, EventArgs e)
however, why is it that the Slider1_TextChanged event fired even even after during page_load, the page was told to do a response.direct ?? shouldn't the entire page have gone through a full-page refresh life cycle ? why did it continue on to attempt to raise the Slider1_TextChanged event?
Web Forms :: Error When Converting Session To String / Object Reference Not Set To Instance Of Object
May 7, 2015I am getting object refernce error at line:if (Session["Tax"].ToString() == "9")
protected void Page_Load(object sender, EventArgs e)
{
if (Session["Tax"].ToString() == "9")
{
lblTax.Text = Session["Tax"].ToString();
}
else
{
lblTax.Text = "0";
}
}
Is anything wrong I have done?
Web Forms :: Session Identifier Is Not Updated Properly ?
Dec 15, 2010I have an ASP.NET 3.5 Web Site.The application has to pass the IBM Rational AppScan before we can push to production.
I am getting the error:
Severity: High
Test Type: Application
Vulnerable URL: http://mytestserver/myapp/login.aspx
Issue: session identifiers is not updated
What can I do to fix this?
Security :: Prevent Session Identifier In Application?
Mar 4, 2010Hacker's attack the session ID in asp.net application. How can we protect the session identifier from hackers.
View 1 RepliesWeb Forms :: Request Form Identifier Expected Error
Dec 23, 2015I tried to use your code for ScrollBackposition in Chrome but gives an error in this statement. Identifier expected. Does scrollY needs to be defined as a HTML tag.
 var scrollY = parseInt('<%=Request.Form["scrollY"] %>');  Â
State Management :: Creating Each Session Key As A Unique Identifier?
Jun 28, 2010First of all here is my code chunk.
[Code]....
Right now I am creating this session with the session key "PhonePart" which is also the name of object I am passing in as a parameter in first method. In subsequent methods, I use the the same name to retreive and clear session value. My problem is, this approach works fine If I instantiate a single object of the class where these methods are defined and using that object call the methods, but when I create another instance of the same class and calls for instance method AddToSession and pass that instance, it overwrites the session value stored by the first instance of the class as the session key is the same that is "PhonePart".
Considering this scenario, is it possible that I somehow grab the name of the object as string in the calling method say "AddToSession" and create a session with that name? If Yes, then I can do the same in subsequent methods and retreive session value and also clear the session specific to that instance name without affecting the other session values stored by other instances.
Forms Data Controls :: Getting An Identifier Expected Error Under The Closing Tag Of This Expression?
Apr 11, 2010I am getting an Identifier expected error under the closing tag of this expression but the code seems to be ok.
[Code]....
Error "Object Reference Not Set To An Instance Of An Object" With Using Session
Dec 17, 2010I am getting thid error 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. Source Error:
Line 18:
Line 19: <%
Line 20: string thedate = Session["indate"].ToString();////;;;;????
Line 21: Response.Write("Starting SAS");
Line 22: try
Source File: c:Documents and SettingsAdministratorMy DocumentsVisual Studio 2008WebSitesWebSite1SASrun.aspx
upload.aspx
<%@ Page language="c#"Debug =true Codebehind="upload.aspx.cs" AutoEventWireup="false"
Inherits="Stardeveloper.UploadAccess.UploadForm" %>
<script runat="server">
void Button2_Click(object sender, EventArgs e)
{
Session["indate"] = Request["txtDate"];
Response.Redirect("SASrun.aspx");
}
</script>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" >
<html>
<head>
</head>
<body>
<body style="background:#80B584">
<form runat=server>
<a href="default.aspx"><b>Main Page</b></a> · Upload Files
<div id="message" runat="server" />
<table align="left" border="0" cellspacing="0" cellpadding="3">
<p style="font-family:arial;color:White;font-size:20px;">Upload new files.</p>
<tr><td><b>MTMDetailed:</b></td><td><input type="file" class="stdInput" name="uploaded_file1"></td></tr>
<tr><td><b>File TRI_FP:</b></td><td><input type="file" class="stdInput" name="uploaded_file2"></td></tr>
<tr><td><b>indate :</b></td><td><input type="text"id="txtDate" name="inputdate"/></td></tr>
<tr><td align="right"><input type="submit" value="Submit"></td></tr>
<asp:Button id="Button2" runat="server" Text="Submit" onClick="Button2_Click" />
</table>
</form>
</body>
</html>
This is part of the code where error is coming from................
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:
[Code]....
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 :: Accessing Control In Usercontrol / Error: Object Reference Not Set To An Instance Of An Object
Apr 19, 2010In the same Code behind file I have:
// This works
Label lblTopNavBarInfo = (Label)Master.FindControl("lblTopNavBarInfo");
lblTopNavBarInfo.Text = "Currently Serving: + FirstName + " " + LastName ;
// This compiles but throws an error in the browser
LinkButton lnkBtnProductsOwned = (LinkButton)LeftNav_CustServ1.FindControl("ProductsOwned"); // The Control is visible
lnkBtnProductsOwned.Enabled = false; // Error: Object reference not set to an instance of an object.
Web Forms :: Error When Adding To Listbox / Object Reference Not Set To An Instance Of An Object
Feb 19, 2010I have just recently converted my VB code to C# and now having this error when I try to add an item to my listbox, and the value is coming from the item page. I get the error at this segement:
lstboxCart.Items.Add(cartItem.Display());
My listbox is supposed to add the product's name, quantity, and price onto one row.
Here's what I have so far:
[code]...
[Code]....
[Code]....
My guess is that the source of the problem could be in the foreach loop from my cart class, shouldn't I be using that for arrays only? If I need to post any markup code or any other class, let me know.
Forms Data Controls :: Get Error : Object Reference Not Set To An Instance Of An Object
Dec 2, 2010I have a nested gridview
i get error:Object reference not set to an instance of an object
when i try to get the text in the footer template of the inner gridview when clicking on the linkbutton!!!
[code]....
Forms Data Controls :: Error : Object Reference Not Set To Instance Of The Object
Feb 3, 2010I am using C# and VS 2008 attached with access database, where Date1 is the PKey in Text defined.
I am getting the above error when i am trying to insert it into the access database.
here is my code
aspx :
[Code]....
Code Behind :
[Code]....
Web Forms :: Object Reference Not Set To Instance Of Object Error Happen When Use 2 Linkbutton
Apr 27, 2016I have two datalist that bind from database and use linkbutton on these datalist
<asp:DataList ID="DLclass" runat="server">
<ItemTemplate>
<asp:LinkButton ID="Linkbtnclass" runat="server" CssClass="lbldasteM"
CommandArgument='<%# Eval("Name") %>' OnClick="Linkbtnclass_Click"><%# Eval("Name") %></asp:LinkButton>
<div id="MM31"></div>
[Code] ....
Here I want when click on linkbutton it change text's color so I wrote below code:
protected void c(object sender, EventArgs e)
{
this.GetCustomersPageWiseMC(1, (sender as LinkButton).CommandArgument);
BindDataListD(DLclassC, "classTI_documentry");
DataListItem item = (DataListItem)(sender as LinkButton).NamingContainer;
foreach (DataListItem dlItems in DLclass.Items)
[Code] ....
For Linkbtnclass_Click it worked correctly and when I click on linkbutton it change color but for LinkbtnclassC_Click when I click on linkbutton it make this error:
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.
Source Error:
Line 537: {
Line 538: LinkButton lb1 = dlItems1.FindControl("Linkbtnclass1") as LinkButton;
Line 539: lb1.ForeColor = ColorTranslator.FromHtml("#646464");
Line 540: }
Line 541:
Web Forms :: Reading Cookies - Object Reference Not Set To Instance Of Object Error
Aug 4, 2012I am using following code for remember me check box
protected void Page_Load(object sender, EventArgs e)Â {Â
if (!IsPostBack)Â {Â
if (Request.Cookies["username"].Value != null && Request.Cookies["password"].Value != null) {Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â
txtuser.Text = Request.Cookies["username"].Value;Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â
txtpwd.Attributes["value"] = Request.Cookies["password"].Value;Â Â Â Â Â Â Â Â Â Â Â
[Code] ....
When I execute the application first time
'Object reference not set to an instance of an object'
error occur..
How to check the cookies or exist or not in local machine?
Web Forms :: DropDownList FindByText - Object Reference Not Set To Instance Of Object Error
Jul 12, 2013In manager.aspx page I have gridview that bind product information from database in this gridview I define linkbutton EDIT that when users click on it they go to Edit.aspx page and in this page users can see their product information and Edit them
In Edit.aspx page I use some textbox and dropdownlist and bind them from database
int data1 = Convert.ToInt32(Request.QueryString["Id"].ToString());
SqlCommand _cmd = new SqlCommand("viewProduct", _cn);
_cmd.CommandType = CommandType.StoredProcedure;
_cmd.Parameters.AddWithValue("@id", data1);
_cn.Open();
SqlDataReader _dr = _cmd.ExecuteReader();
[Code] ....
When I click on EDIt linkbutton from gridview it go to Edit.aspx page and bind all data from database and ofcourse show data in Dropdownlist untill now every thing is ok
but when I change some Item in this page i.e Name of product when I changed and clicked on button to update table in database it update data in database but below error happen too
Server Error in '/behtop website' 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.
Source Error:Â
Line 79:
Line 80:
Line 81: DDL1.Items.FindByText(_dr["classification"].ToString()).Selected = true; Line 82: DDL2.Items.FindByText(_dr["subset"].ToString()).Selected = true;
Line 83:
And when I back to manager.aspx and again click on Edit linkbutton to Edit that product it didn't load Edit.asp page and above error happen again...
This error happen just when I want edit product information in other time if I don't edit any thing edit.aspx page load successfully...
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.
[Code]....
Error returned was "Object reference not set to an instance of an object." on this line:
[Code]....
Forms Data Controls :: Grid View OnDataRowBound Error: Object Reference Not Set To An Instance Of An Object?
Jul 2, 2010The stored proc fired to populate my grid view gets a column CasNo.The GridView has a DataBound item for CaseNo.
[Code]....
Then Why does this get null value: string caseNo = dataRow["CaseNo"] as string;
[Code]....
[Code]....
Web Forms :: Error Handling For Object Reference Not Set To An Instance Of An Object?
Aug 17, 2010This might have been asked before but I did a quick search and found nothing.
Problem: I want to get the name of the object that has a value of nothing and the type of the object when the "Object reference not set to an instance of an object error" occurs. The type obviously can be Object or specific. I want this information so that I can log a better error message in the error handling module. The only real useful information currently that comes back from the Exception object on a try catch is the line number at which the error occurred which in most cases is adequate except when you have functions calling functions, all in one line.
Web Forms :: Get Error / Object Reference Not Set To An Instance Of An Object For An Array In Vb.net?
Oct 14, 2010I have the following code
[Code]....
But I get Object refernce not set to instance of an object error at
If Not ls_case_no.Length = 0 Then
What if statment should I use? - I want if there is no value in ls_case_no array then the if stmt should not be executed
Web Forms :: Error - Object Reference Not Set To An Instance Of An Object
Jan 5, 2010I'm using asp.net with asp.net configuration and I keep on getting the same error:
"Object reference not set to an instance of an object."
It happens when I'm logged in to the website and i leave a page open for more then 5 minutes without doing anything.. I can't trace it because on debug mode it works fine.. First i thought it might be the session timeout but I've extended it to 60 minutes and still the same error.
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 RepliesCreate A Copy Of An Object In Session To Update Without Updating Session?
Jul 20, 2010I am confused about how to reference objects in session, how to update, and copy.
if I create
MyObject obj = new Object ();
then
Session["object"] = obj;
MyObject temp = (MyObject)Session["object"];
If i change something on temp, will the object in session be updated? do i need to follow changes with Session["object"] = temp?
State Management :: How To Manage Session Data Outside The Session Object
Oct 7, 2010I want to be able to persist data across a session but do this outside of the built-in session state object. Why is a long story that I will not go into here. I just need to know where I can put data other than in the session object that will persist across the specific session.
View 3 Replies