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Factory pattern in C#: How to ensure an object instance can only be created by a factory class?

... method of a factory class. Let us say I have some "business object" class and I want to make sure any instance of this class will have a valid internal state. In order to achieve this I will need to perform some check before creating an object, probably in its constructor. This is all okay until I ...
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How to make modal dialog in WPF?

I am writing my first application in WPF and want to have the user input some data on a modal dialog window. Apparently, this is not simple to do in WPF, because the parent window stays fully enabled, and the method that created the new child window doesn't stop and wait for the child window to cal...
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Can I simultaneously declare and assign a variable in VBA?

I'm new to VBA and want to know if I can convert the following declaration and assignment into one line: 5 Answers ...
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Naming convention for utility classes in Java

..., as that you use it consistently. Like, if you have three utility classes and you call them CustomerUtil, ProductUtils, and StoreUtility, other people trying to use your classes are going to constantly get confused and type CustomerUtils by mistake, have to look it up, curse you a few times, etc. (...
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How to set specific java version to Maven

On my machine I have two java versions installed: (1.6 and 1.7 installed manually by me). I need both of them for different projects. But for Maven I need 1.7, now my Maven uses 1,6 java version, how can I set Maven to use 1.7? ...
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How to configure multi-module Maven + Sonar + JaCoCo to give merged coverage report?

I've searched up and down the internet for this one. There's lots of half-answers out there, to do with Maven properties such as ${sonar.jacoco.reportPath} , or org.jacoco:jacoco-maven-plugin:prepare-agent or setting maven-surefire-plugin argLine with -javaagent . ...
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What is the difference among col-lg-*, col-md-* and col-sm-* in Bootstrap?

What is the difference among col-lg-* , col-md-* and col-sm-* in Twitter Bootstrap? 11 Answers ...
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Array versus List: When to use which?

What are the scenarios when one is preferable over the other? And why? 16 Answers 16 ...
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How do I check that a number is float or integer?

...0; } Update 2019 5 years after this answer was written, a solution was standardized in ECMA Script 2015. That solution is covered in this answer. share | improve this answer | ...
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When should I use the “strictfp” keyword in java?

...rict expressions must be those predicted by IEEE 754 arithmetic on operands represented using single and double formats. Within an expression that is not FP-strict, some leeway is granted for an implementation to use an extended exponent range to represent intermediate results; the n...