nullreferenceexception

When I build my solution with a bunch of cloud projects, I see one or more "Error: Object reference not set to an instance of an object" messages in the output. When I try to run one of the cloud projects, I get the popup "There were build errors. Do you want to continue and run the last successful build", but there are no errors in the Error List and the same "Error: Object ref..." errors in the output. When I click package on my cloud project I get a messagebox with "Object reference not set to an instance of an object", also when I right click -> properties on the project reference under

I want to check that session is null or empty i.e. some thing like this: if(Session["emp_num"] != null) { if (!string.IsNullOrEmpty(Session["emp_num"].ToString())) { //The code } } Or just if(Session["emp_num"] != null) { // The code } because sometimes when i check only with: if (!string.IsNullOrEmpty(Session["emp_num"].ToString())) { //The code } I face the following exception: Null Reference exception Use this if the session variable emp_num will store a string: if (!string.IsNullOrEmpty(Session["emp_num"] as string)) { //The code } If it doesn't store a string, but some other type, you

I have a rather strange issue i'm not sure how to fix or if i can even fix it. I've done some research into the issue but can't find an answer to what's causing it. I'm following a rather simple guide at http://www.asp.net/mvc/tutorials/mvc-5/create-an-aspnet-mvc-5-app-with-facebook-and-google-oauth2-and-openid-sign-on and after enabling SSL and changing the controller to require https i get the following 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.

This has got me stumped. I was trying to optimize some tests for Noda Time, where we have some type initializer checking. I thought I'd find out whether a type has a type initializer (static constructor or static variables with initializers) before loading everything into a new AppDomain . To my surprise, a small test of this threw NullReferenceException - despite there being no null values in my code. It only throws the exception when compiled with no debug information. Here's a short but complete program to demonstrate the problem: using System; class Test { static Test() {} static void Main

I'm trying to prevent System.NullReferenceException. I have a Company, which has a collection of Employees. Each Employee has a collection of Skills. SelectedEmployee points to the currently selected element within the Employee collection. SelectedSkill points to the currently selected element within the collection of Skills. I have a ListView that has its ItemSource bound to the Skills collection; The ListView's SelectedItem is bound to the SelectedSkill. When a Skill is deleted I want the ListView to scroll to the last element. private void DeleteSelectedSkillFromSelectedEmployee() { Company

I've been developing a face recognition application using EmguCV (C#). I got the whole thing working okay if I store the face images (training set) in simple windows folder. But, after I tried to migrate the face images to be stored in a Microsoft Access database, an 'object reference not set to an instance of an object' exception message often occurs (not always, but most of the time) when the application tries to recognize a face from the video feed. Funny thing is, the recognition actually still works okay if the exception happens to not occur. Here is the snippet of the code of my program,

I tried to get some help earlier and I don't think I provided enough information though I appreciate all the advice. The goal is simply to add a new instance of the Object Room to an array and print to a list box. When a user attempts to enter a room name that is already in existence it should simply display in the specs for the room that is already in the array. I keep getting a null reference exception. Here is my code: using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.Linq; using System.Text; using System