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1866 votes
26 answers
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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?
Community wiki
22 revs, 16 users 40%
John Saunders
848 votes
15 answers
253k views

I have the following function: //Function to get random number public static int RandomNumber(int min, int max) { Random random = new Random(); return random.Next(min, max); } How I call it: ...
Ivan Prodanov's user avatar
  • 35.7k
1315 votes
10 answers
375k views

What's the best way to call a generic method when the type parameter isn't known at compile time, but instead is obtained dynamically at runtime? Consider the following sample code - inside the ...
Bevan's user avatar
  • 44.4k
294 votes
11 answers
83k views

I met an interesting issue about C#. I have code like below. List<Func<int>> actions = new List<Func<int>>(); int variable = 0; while (variable < 5) { actions.Add(() =&...
Morgan Cheng's user avatar
  • 76.4k
1670 votes
53 answers
1.3m views

How can you convert a byte array to a hexadecimal string and vice versa?
Community wiki
8 revs, 5 users 53%
alextansc
1148 votes
32 answers
725k views

What is the best way to randomize the order of a generic list in C#? I've got a finite set of 75 numbers in a list I would like to assign a random order to, in order to draw them for a lottery type ...
mirezus's user avatar
  • 14.3k
148 votes
11 answers
299k views

I have a list of items send from a PHP file to unity using WWW. The WWW.text looks like: [ { "playerId": "1", "playerLoc": "Powai" }, { "playerId": "2", "...
dil33pm's user avatar
  • 1,653
811 votes
43 answers
357k views

I'm using the Excel interop in C# (ApplicationClass) and have placed the following code in my finally clause: while (System.Runtime.InteropServices.Marshal.ReleaseComObject(excelSheet) != 0) { } ...
HAdes's user avatar
  • 17.1k
1600 votes
33 answers
765k views

In C#, what makes a field different from a property, and when should a field be used instead of a property?
Community wiki
7 revs, 7 users 100%
Anonymous
121 votes
7 answers
69k views

I've created a simple Winforms application in C#. When I run the application on a machine with high DPI settings (e.g. 150%), the application gets scaled up. So far so good! But instead of rendering ...
Boris's user avatar
  • 9,041
115 votes
4 answers
161k views

How to detect UI object on Canvas on Touch in android? For example, I have a canvas that have 5 objects such as Image, RawImage, Buttons, InputField and so on. When I touch on Button UI object Then ...
Dennis Liu's user avatar
  • 2,368
2191 votes
49 answers
1.4m views

How can I create an Excel spreadsheet with C# without requiring Excel to be installed on the machine that's running the code?
Community wiki
15 revs, 9 users 35%
mistrmark
74 votes
4 answers
187k views

I have to program an application management system for my OJT company. The front end will be done in C# and the back end in SQL. Now I have never done a project of this scope before; in school we had ...
LeonidasFett's user avatar
  • 3,152
293 votes
9 answers
226k views

Can Application.DoEvents() be used in C#? Is this function a way to allow the GUI to catch up with the rest of the app, in much the same way that VB6's DoEvents does?
Craig Johnston's user avatar
  • 7,627
84 votes
4 answers
58k views

How do I pass a whole set model object through formdata and convert it to model type in the controller? Below is what I've tried! JavaScript part: model = { EventFromDate: fromDate, ...
Guruprasad J Rao's user avatar
  • 29.7k
66 votes
15 answers
556k views

I'm looking for a library/method to parse an html file with more html specific features than generic xml parsing libraries.
Luke's user avatar
  • 19k
1215 votes
24 answers
1.2m views

I am trying implement the Data transformation using Reflection1 example in my code. The GetSourceValue function has a switch comparing various types, but I want to remove these types and properties ...
pedrofernandes's user avatar
  • 16.9k
1424 votes
26 answers
1.3m views

From my understanding one of the main things that async and await do is to make code easy to write and read - but is using them equal to spawning background threads to perform long duration logic? I'...
Dan Dinu's user avatar
  • 33.5k
399 votes
8 answers
1.7m views

Consider: namespace WindowsApplication1 { public partial class Form1 : Form { public Form1() { InitializeComponent(); } private void button1_Click(...
Midhat's user avatar
  • 4,317
1500 votes
17 answers
2.6m views

How can I make an HTTP POST request and send data in the body?
Hooch's user avatar
  • 29.8k
154 votes
21 answers
77k views

Anyone have a good resource or provide a sample of a natural order sort in C# for an FileInfo array? I am implementing the IComparer interface in my sorts.
Michael Kniskern's user avatar
  • 25.4k
1812 votes
15 answers
726k views

From time to time I see an enum like the following: [Flags] public enum Options { None = 0, Option1 = 1, Option2 = 2, Option3 = 4, Option4 = 8 } I don't understand what ...
Brian Leahy's user avatar
  • 35.8k
675 votes
25 answers
1.1m views

How to perform left outer join in C# LINQ to objects without using join-on-equals-into clauses? Is there any way to do that with where clause? Correct problem: For inner join is easy and I have a ...
Toy's user avatar
  • 6,803
713 votes
10 answers
714k views

I want a true deep copy. In Java, this was easy, but how do you do it in C#?
user18931's user avatar
  • 11k
48 votes
3 answers
7k views

I have been using NewtonSoft JSON Convert library to parse and convert JSON string to C# objects. But now I have came across a really awkward JSON string and I am unable to convert it into C# object ...
TaLha Khan's user avatar
  • 2,443

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