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What does “Object reference not set to an instance of an object” mean? [duplicate]
...a System.NullReferenceException. Which is the same as Object reference not set to an instance of an object.
The following code is a simple way of reproducing this:
static void Main(string[] args)
{
var exampleClass = new ExampleClass();
var returnedClass = exampleClass.ExampleMethod();
...
Auto increment in phpmyadmin
...e.
Click on Table > Structure tab > Under Action
Click Primary (set as primary),
click on Change on the pop-up window, scroll left and check A_I. Also make sure you have selected None for Default
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How to set up fixed width for ?
...s="span1">D</td>
</tr>
** If you have <th> elements set the width there and not on the <td> elements.
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How to change or add theme to Android Studio?
...
File->Settings->Editor->Colors & Fonts-> In scheme name select Darcula and apply to see a awesome dark background theme editor
Android Studio 3.1.2
File->Settings->Editor->Color Scheme-> In scheme name se...
Most tricky/useful commands for gdb debugger [closed]
... through frames
watch: Suspend the process when a certain condition is met
set print pretty on: Prints out prettily formatted C source code
set logging on: Log debugging session to show to others for support
set print array on: Pretty array printing
finish: Continue till end of function
enable and d...
The type 'string' must be a non-nullable type in order to use it as parameter T in the generic type
...d properties:
public class WordAndMeaning
{
public string Word { get; set; }
public string Meaning { get; set; }
}
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CSS Pseudo-classes with inline styles
...an inline style attribute can only contain property declarations; the same set of statements that appears in each ruleset in a stylesheet. From the Style Attributes spec:
The value of the style attribute must match the syntax of the contents of a CSS declaration block (excluding the delimiting brac...
MySQL - force not to use cache for testing speed of query
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A nice article about mysql Query cache. How to setup and see the cache in action! Worth the read. databasejournal.com/features/mysql/article.php/3110171/…
– Adrian P.
Feb 20 '14 at 18:03
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MySQL Creating tables with Foreign Keys giving errno: 150
...) or vice versa.
Any string-type FK column(s) must have the same character set and collation as the corresponding PK column(s).
If there is data already in the Child table, every value in the FK column(s) must match a value in the Parent table PK column(s). Check this with a query like:
SELECT COUN...
Unsupported major.minor version 52.0 [duplicate]
...he JDK and JRE pointed to the same version.
In IntelliJ IDEA,
Go to Maven Settings → Maven → Importing. Set the JDK for importer to 1.8.
Go to Maven Settings → Maven → Runner. Set the JRE to 1.8.
Go to menu File* → Project Structure → SDKs. Make sure the JDK home path is set to 1.8.
Re...