Edit: The line of code that gives the exception is "foreach (Column column in table.Columns) " and that's because the Table table object is null. How would I load a Table object? My code seemed to be the right approach but it doesn't work as expected. :D I'm pulling a list of all columns in a given SQL table, and then loading them to a ...
Hi All, I've got an ASP.Net application, which starts throwing NUllReferenceExceptions, after a long period of running. The code in question is used early on in each individual session, where we're trying to establish some kind of referrer information. The thing is, I can't fathom out what can throw this exception. The method in questi...
Hi All, I have a GridView and, using a fairly common method, I'm using a FooterRow and TemplateFields to provide the missing insert ability. So far so good. The footer contains a TemplateField with a LinkButton to provide the postback that does the insertion. In the handler for the LinkButton's click, the Insert() method is called on...
This one is sort of esoteric. I ran into a NullReferenceException while trying to open a form (in the winforms designer) in a winforms project in visual studio 2008. The stack trace points to the fourth line of the following code: public static class Logger { public static void LogMethodEnter() { var frame = new StackFr...
I have the need to develop a custom HttpHandler in SharePoint. To start, I just coded up a simple example: http://pastebin.com/HXLjR2xT. On line 35 or 36 of that code I get a NullReferenceException thrown if I call my HttpHander page from jQuery. But if I call the page directly in my browser, I get the results I expect. I have seen some ...
Ever since I started programming this question has been annoying me, not "where is my code null" but specifically is there any way to get the type of the object that is null from the exception? Failing that, can anyone provide a blog post or msdn article that explains the reason why the .NET Framework doesn't (or can't) provide these de...
I did look at the related posts that were answered, but still get the NullReference exception in InsertOnSubmit(). I have an auto generated LINQ class Transaction from which I create a derived class that overrides ToString(): public partial class MyTransaction:DataAccess.Transaction { public MyTransaction():base() { } ...
I'm running into a very strange behavior in C#/.NET 3.5... I am writing a class which hooks into upload pipeline of a content management system. The CMS executes this hook via reflection. For some unknown reason the following code fails by throws a NullRef ("Files" is an HttpFileCollection). foreach (var fileKey in args.Files.AllKeys...
Hello, I am trying to extract data from XML. I generated C# classes using XSD of this XML file. I am trying to get the data from XML file and save it C# class. I am running into NULLReferenceException Was Unhadled by User; "Object reference not set to an instance of an object." error. My XML File <clue_personal_auto xmlns = "http://...
For a class assignment, we are writing a custom syscall which pulls certain information about the existing process tree. The syscall is working fine for the most part and gets the appropriate information. However, a few processes it, in crashes with the error message, "Unable to handle kernel NULL pointer dereference at virtual address...
I have a long running program that exectues some mySQL-Queries every 5 minutes (timed thread). After it has run for approximately 10 hours a NullReferenceException is thrown with the following stacktrace: at MySql.Data.MySqlClient.NativeDriver.GetResult(Int32& affectedRow, Int32& insertedId) bei MySql.Data.MySqlClient.Driver.GetResul...
I have defined a performance counter as: PerformanceCounterCategory pcc = new PerformanceCounterCategory("Network Interface", ipAddress); string instance = pcc.GetInstanceNames()[1]; //first card PerformanceCounter bandwidthCounter = new PerformanceCounter("Network Interface", "Current Bandwidth", instance, ipAddress); in my code, b...
A NullReferenceException is thrown by the runtime when I convert XElement into XmlNode using the following function: public static XmlNode GetXmlNode(this XElement element) { using (XmlReader xmlReader = element.CreateReader()) { XmlDocument xmlDoc = new XmlDocument(); xmlDoc.Load(xmlReader); xmlDoc.Child...
When we run this line: Brettle.Web.NeatUpload.ProgressInfo progress = GreyBoxProgressBar1.ProcessingProgress = new Brettle.Web.NeatUpload.ProgressInfo(1, ""); We get this exception: Timestamp: 22.10.2010 12:27:00 Message: System.NullReferenceException: Object reference not set to an instance of an object. at Brett...
Hi, I'm developing an ASP.NET website in viusal studio 2008, the thing is that I changed a line in the code, this change trows an exception (NullReferenceException) at runtime, after I change the line back it still trows the same exception, I want to follow the stack trace to look into the error and solve it, can you guys give some tips?...
I have the following sentence: var customers = from customer in Context.ps_customer select customer; As you can see, it is the most simple sentence in the world. Well, it throws a NullReferenceException, and I don't have any idea why. in fact, the exception is thrown at List<ps_customer> clientes = customers.ToList<p...
Hello all! First time posting. :) I'm a pretty new developer so I'm not well versed in common ASP.NET problems. 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 NullReferenc...
I'm trying to switch between 2 templates on the basis of a data trigger. But I app crashes with the "Object reference not set to an instance of an object." If I comment out the setter for the template it runs fine. Here's my XAML: <Style x:Key="ListViewItemStyle" TargetType="{x:Type ListViewItem}"> <Setter Property="Template" V...