I am reading an article about the MVVP Pattern and how to implement it with WPF. In the source code there are multiple lines where I cannot figure out what the ques开发者_开发百科tion marks in it stan
I use Nullable<T> types quite a lot when loading values into classes and structs when I need them to be nullable, such as loading a nullable value from a database (as the example below).
I want my C# program to know if the notNULL constraint is set for a specific Firebird database column. Can it be checked dynamically, perhaps by querying the meta data? I find the Firebird documentati
a bool variable could hold true or false, while bool? could be null as well. Why would we need a third value for bool ?
Hi I was recently watching an old video about how null pointers were开发者_如何学Python a billion dollar mistake. He points out both C# and java as they have run-time checks but don\'t completely elim
please tell me how to implement Nullable Parameter of type string in vb.net Function: sub savedetail(byval name as string, byval age as integer)
Today I found a strange problem that is I have a Table With a Nullable Column and I tried to use following Query
This question already has answers here: 开发者_如何学JAVA Closed 12 years ago. Possible Duplicate:
We are working on exposing an assembly to COM. Among other things, we frequency use nullable values such as long?, DateTime?, etc.These are generic types and can\'t be exposed to COM.
If I declare a nullable (either via Nulla开发者_StackOverflow中文版ble or the ? symbol) variable from a value type, does it still respect the rules of value types (i.e. pass by value by default, deall
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