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right click context menu for datagridview
... a datagridview in a .NET winform app. I would like to rightclick on a row and have a menu pop up. Then i would like to select things such as copy, validate, etc
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How to “test” NoneType in python?
...ariable has None in it or not.
Quoting from is docs,
The operators is and is not test for object identity: x is y is true if and only if x and y are the same object. x is not y yields the inverse truth value.
Since there can be only one instance of None, is would be the preferred way to check...
Ruby optional parameters
...his method: e.g. If you're trying to make the default value for scope true and you pass in false, scope ||= true won't work. It evaluates the same as nil and will set it to true
– Joshua Pinter
Nov 10 '11 at 5:32
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What is the scope of variables in JavaScript?
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TLDR
JavaScript has lexical (also called static) scoping and closures. This means you can tell the scope of an identifier by looking at the source code.
The four scopes are:
Global - visible by everything
Function - visible within a function (and its sub-functions and blocks)
Bloc...
How to write a CSS hack for IE 11? [duplicate]
...nly for IE 11? I have a website that looks bad in IE 11.I just search here and there but didnt find any solution yet.
8 Ans...
Why can't an anonymous method be assigned to var?
...to be the default instead of Predicate or Action or any other possibility? And, for lambdas, why is it obvious that the intention is to choose the delegate form, rather than the expression tree form?
But we could say that Func is special, and that the inferred type of a lambda or anonymous method i...
Should I use @EJB or @Inject
I have found this question: What is the difference between @Inject and @EJB but I did not get any wiser. I have not done Java EE before nor do I have experience with dependency injection so I do not understand what I should use?
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When to make a type non-movable in C++11?
...x objects. If std::mutex contained a native OS mutex type as a data member and the native type's address must stay fixed (because the OS maintains a list of pointers to its mutexes) then either std::mutex would have to store the native mutex type on the heap so it would stay at the same location whe...
How can I find the length of a number?
...34567;
x.toString().length;
This process will also work forFloat Number and for Exponential number also.
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C# using streams
...treams are kind of mysterious to me. I don't know when to use which stream and how to use them. Can someone explain to me how streams are used?
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