ADO.NET :: Checking For Empty Object - Or No Object At All
Feb 7, 2011
I have a simple linq query that queries the database, where QueryString = a value.
[Code]....
My issue is, if the query does NOT return any results, as the the data does not exsist in the table, hence returns 0 rows, it throws up an error which i understand. However, i have tried a few ways to check if the object has been created in the firstplace but to no vail. I have used Isnothing and DBnull but could not get it to work.
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Oct 19, 2010
How do i check for empty array?
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Aug 27, 2010
private void FillDetails(string pId, out string Name, out string Address)
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I have method called Filldetails(),This method uses stored procedure to retrieve information for product name and address based on productid passed from productdetails table.I am working on globalization project.We have this product information for US country but there is no product information for germany country.So dataset is empty for germany.As result I am getting error object reference not set to an instance of the object.
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Oct 12, 2010
I have a view that gets populated via this code
[Code]....
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Nov 22, 2010
I am using a view to create some new categories in the DB but the object the [httpost] create method receives is empty, now this does not always happens. I did double check with other catalogscontrollers and so far the implementation is the same... It only happensds when i try to create a new category the CategoryController
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the ViewModel
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Feb 17, 2010
I've created my dataset in my App_Code folder. I tested it so it works, But then when I add in my page an ObjectDataSource, it can find any object the list is empty. I looked for online some solution but I didn't find something which worked. It works when I add the code manually, but i would like to understand how come, which part I misunderstood.
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Dec 28, 2010
Using C#, ODP.NET and ASP.NET Web Services:
ClassA is a custom class generated from a "type" in oracle database.
ClassB is a custom class generated from a "table of type ClassA" in Oracle database.
The exposed service includes a login procedure which gets a username as input parameter and returns object B. Debugging the login procedure I can see that the data is retrieved from the database but not printed in the wsdl..
[Code]....
My ClassB definition is as follows:
[XmlInclude(typeof(ClassB))]
public class ClassB : INullable, IOracleCustomType, IXmlSerializable
...
similar definition holds for ClassA as well. the generated wsdl is :
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May 26, 2010
I am trying to pass a key value from one page to another, using VB.net and Visual Studio 2008 Professional. I am creating a session variable in one aspx page and trying to retrive the value in the second aspx page (Dircted to by a button with the postbackurl set) However, the session object is empty when I try to access it in the second page. If, however, i put a debug hold on the code which retrieves the variable, and examine the session object from the "locals" debug window, i see contents. When I then resume the application the code retrieves the value correctly. I am executing my code using the development server that comes with Visual Studio. Could it have something to do with that?
First Page:
[Code]....
Second Page:
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Nov 15, 2010
In 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]....
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Apr 20, 2010
im tryin to create a login form.
and am receiving the following error:
Object reference not set to an instance of an object
[Code]....
and heres my aspx page:
[Code]....
Stored procedure:
[Code]....
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Dec 23, 2010
this 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)
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Apr 21, 2010
can you please help me to brainstorm the possible causes of this error. I've got a paged repeater with localisation bound programitcally to an sqldatasource using a stored proc. I can post code if needs be but it's rather long. I'm looking for typical causes of this error + will make note for future reference!
erver Error in '/WebSite4' 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:
[Code]....
Line 233:Line 234: Repeater1.DataSource = PagedResultsLine 235: Repeater1.DataBind()Line 236: doPaging()Line 237: End Sub
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Feb 1, 2010
I am trying to get the value of the id field in my gridview but I keep coming up with this error when i do selectedValue or selecteIndex
Exception Details: System.NullReferenceException: Object reference not set to an instance of an object.
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[Code]....
[Code]....
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Mar 6, 2010
I'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.
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Apr 19, 2010
In the same Code behind file I have:
// This works
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Nov 2, 2010
I have a website written in C# that was running fine on one server. We moved it to another server and have a couple issues. I am mainly a VB.NET coder but can do a few things in C#. This is not a project - it is a website and can open it in VS2008 no problem. This is an admin site for the whole website where the user can add customer comments, etc. When logging in, it works fine. I can go to one of the admin pages after logging in and works. If I go to two other different pages, I get this error:
Object reference not set to an instance of an object.
[Code]....
It turns out this is in the main.master page and it is used by the other pages that load fine. The ApplicationTitle variable is set right in the web.config file and like I said, it shows on the other pages.
My question is why would this code work fine for some pages and not two others? All of these admin pages are under a folder called Admin and the web.config file is in the root folder of the website. Its almost like these two pages cannot see the web.config file in the root folder? Why would that be if thats the case?
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We have an applicaiton that was converted to the new framework using the wizard in Visual Studio 2008. When we install the applicaiton in production and change the iis settings to use the 2.0 framework we start to see these errors in the event viewer on the web servers. We are using SQL Server Session State and have 3 web servers in a load balancer. Object reference not set to an instance of an object.</Message><StackTrace> at System.Web.SessionState.SessionStateModule.PollLockedSessionCallback...
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I have a webservice, it has few webmethods. when i create a client proxy and invoke the methods to check its response, i am getting this error. Can someone tell me what things can i check to know the cause of this? The error is not saying much hence blocked on this.
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Dec 22, 2013
 I am trying to implement the code URL...I have a database table with Integer type.Here is the running code line: Code in GridView:
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<ItemTemplate>
<%# Eval("RegionNavn")%>
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<EditItemTemplate>
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[code]...
On Edit Click, the DropDownList in the GridView brings the previously selected value.On Update Click, the error is:Â "System.FormatException: Input string was not in a correct format."
dCmd.Parameters.Add("@KystverketRegionID", SqlDbType.Int).Value = int.Parse(ddKystverketRegionID.SelectedValue);
Â
When I use the following code:
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May 7, 2015
I am getting object refernce error at line:if (Session["Tax"].ToString() == "9")
protected void Page_Load(object sender, EventArgs e)
{
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lblTax.Text = Session["Tax"].ToString();
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lblTax.Text = "0";
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}
Is anything wrong I have done?
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May 30, 2013
I have this part in the Gridview.
<asp:TemplateField HeaderText="Student">
<ItemTemplate>
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</asp:DropDownList>
[Code]....
After the change, when it is to bind data, I get this Exception message. Why?Object reference not set to an instance of an object.
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Feb 19, 2010
I 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.
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Mar 12, 2010
I am receiving Object reference not set to an instance of an Object when binding Child dataGrid in the ItemCommandEvent of Parent dataGrid.
[code].....
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Dec 2, 2010
I 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]....
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Jun 17, 2010
Again, I am new to the ASP.NET world, and I come from a Windows Forms background. I'm working with an ObjectDataSource that retrieves a collection of business objects. With the collection, I am going to be binding it to a CheckBoxList and other various controls. The business object that I am using is an Employee.
To get all of the employees, I create an ObjectDataSource and set the "Select" method. I then set the DataSourceID of the CheckBoxList to be that of the ObjectDataSource. When I load the page for the first time, I see all of the employees. Now, the user goes through this page and selects all the employees they want to see information about (by checking the box next to the employee name). Finally, the user hits the button called "Display." Upon postback how do I get a list of those employees? I've tried the following solution, but I'm not sure if it's the best practice in obtaining all those employees again. Here's my solution...
In the CheckBoxList, I set the DataTextField to the Employee's name. I also set the CheckBoxList's DataValueField. This property is a little different. I set this to be a UNIQUE IDENTIFIER, which can distinguish this employee from other employees. Now, when the user hits the button "Display" I use my ObjectDataSource again and MANUALLY call ObjectDataSource.Select(). I cast the returned value as a List<Employee>. Finally, I iterate through all list items in the CheckBoxList...
[Code]....
If the item is selected, I parse through my list of employees that was returned from the bjectDataSource.Select(). I use the item.Value and compare it to each employee's "key." If the key is found, I know that the employee is selected. I put this employee in another list called EmployeesSelected.
Finally, I take EmployeesSelected (which is a List) and set my GridView's .DataSource and call .DataBind() on the GridView.
Is this the "best practice" of re-obtaining the Employees that are selected on my page, or am I making this too complicated?
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