Top "Nullreferenceexception" questions

The .NET exception that is thrown when there is an attempt to reference (or use) a null or uninitialized object.

What does "Object reference not set to an instance of an object" mean?

I am receiving this error and I'm not sure what it means? Object reference not set to an instance of …

.net nullreferenceexception
What is a NullReferenceException, and how do I fix it?

I have some code and when it executes, it throws a NullReferenceException, saying: Object reference not set to an instance …

c# .net vb.net null nullreferenceexception
Checking if an object is null in C#

I would like to prevent further processing on an object if it is null. In the following code I check …

c# null nullreferenceexception
How to solve Object reference not set to an instance of an object.?

In my asp.net program.I set one protected list.And i add a value in list.But it shows …

c# asp.net nullreferenceexception
Checking session if empty or not

I want to check that session is null or empty i.e. some thing like this: if(Session["emp_num"] != …

c# asp.net session nullreferenceexception tostring
Error checking for NULL in VBScript

I have the following VBScript in a Classic ASP page: function getMagicLink(fromWhere, provider) dim url url = "magic.asp?fromwhere=" &…

asp-classic vbscript null nullreferenceexception nothing
C# elegant way to check if a property's property is null

In C#, say that you want to pull a value off of PropertyC in this example and ObjectA, PropertyA and …

c# nullreferenceexception nullable null-conditional-operator
How to check if a Datatable is Null or Nothing

How can I check if a DataTable has never been set, meaning it will be Null or Nothing? I don't …

vb.net datatable nullreferenceexception
httpcontext.current.server.mappath Object reference not set to an instance of an object

I am using the following code within a class: string filePath = HttpContext.Current.Server.MapPath("~/email/teste.html"); The file …

c# nullreferenceexception
How to use global var across files in a package?

I have the following file structure: models/db.go type DB struct { *sql.DB } var db *DB func init() { dbinfo := …

pointers go database-connection nullreferenceexception