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I have some code and when it executes, it throws a NullReferenceException, saying: Object reference not set to an instance of an object. What does this mean, and what can I do to fix this error?
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John Saunders
324 votes
22 answers
1.4m views

I would like to prevent further processing on an object if it is null. In the following code I check if the object is null by either: if (!data.Equals(null)) and if (data != null) However, I ...
developer's user avatar
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270 votes
8 answers
2.4m views

I am receiving this error and I'm not sure what it means? Object reference not set to an instance of an object.
mohammad reza's user avatar
  • 3,482
220 votes
22 answers
702k views

This is probably the biggest waste of time problem I have spent hours on solving for a long time. var db = new hublisherEntities(); establishment_brands est = new establishment_brands(); est....
danielovich's user avatar
  • 9,757
198 votes
2 answers
9k views

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 ...
Jon Skeet's user avatar
  • 1.5m
127 votes
20 answers
191k views

In C#, say that you want to pull a value off of PropertyC in this example and ObjectA, PropertyA and PropertyB can all be null. ObjectA.PropertyA.PropertyB.PropertyC How can I get PropertyC safely ...
Jon Kragh's user avatar
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70 votes
2 answers
717k views

In my asp.net program.I set one protected list.And i add a value in list.But it shows Object reference not set to an instance of an object error protected List<string> list; protected void ...
r.vengadesh's user avatar
  • 1,837
67 votes
2 answers
10k views

I'm experiencing an interesting System.NullReferenceException whilst using the new null-conditional operator in C#. The following code gives me a NullReferenceException if "MyObject" is null: await ...
User_FSharp1123's user avatar
  • 1,221
63 votes
6 answers
35k views

I've had an asp.net website running live on our intranet for a couple of weeks now. I just got an email from my application_error emailer method with an unhandled exception. Here it is (I've cleaned ...
RodH257's user avatar
  • 3,612
62 votes
4 answers
4k views

I have the following function: public static T TryGetArrayValue<T>(object[] array_, int index_) { ... //some checking goes up here not relevant to question dynamic boxed = array_[...
bedo's user avatar
  • 876
55 votes
3 answers
71k views

I have the following file structure: models/db.go type DB struct { *sql.DB } var db *DB func init() { dbinfo := fmt.Sprintf("user=%s password=%s dbname=%s sslmode=disable", DB_USER,...
lionelmessi's user avatar
  • 1,154
51 votes
16 answers
18k views

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 ...
micah hawman's user avatar
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49 votes
3 answers
25k views

I am doing a little debugging, and so I want to log the eventArgs value I have a simple line that basically does: logLine = "e.Value: " + IIf(e.Value Is Nothing, "", e.Value.ToString()) The way I ...
Nathan Koop's user avatar
  • 25.3k
44 votes
5 answers
67k views

I am using the following code within a class: string filePath = HttpContext.Current.Server.MapPath("~/email/teste.html"); The file teste.html is in the folder But when it will open the file the ...
soamazing's user avatar
  • 1,696
37 votes
1 answer
42k views

If we cast some null variable to a type, I expect the compiler to throw some exception, but it doesn't. Why? I mean string sample1 = null as string; string sample2 = (string)null; object t1 = null; ...
yigitt's user avatar
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