What namespaces are necessary to create a localized application?
System.Globalization and System.Resources.
What is the smallest unit of execution in .NET?
an Assembly.
When should you call the garbage collector in .NET?
As a good rule, you should not call the garbage collector. However, you
could call the garbage collector when you are done using a large object
(or set of objects) to force the garbage collector to dispose of those
very large objects from memory. However, this is usually not a good
practice.
How do you convert a value-type to a reference-type?
Use Boxing.
What happens in memory when you Box and Unbox a value-type?
Boxing converts a value-type to a reference-type, thus storing the
object on the heap. Unboxing converts a reference-type to a value-type,
thus storing the value on the stack.Difference between directcast and
ctype.
Answer1
DirectCast requires the run-time type of an object variable to bethe
same as the specified type.The run-time performance ofDirectCast is
better than that of CType, if the specified type and the run-time typeof
the expression are the same. Ctype works fine if there is a valid
conversion defined between the expression and the type.
Answer2
The difference between the two keywords is that CType succeeds as long
as there is a valid conversion defined between the expression and the
type, whereas DirectCast requires the run-time type of an object
variable to be the same as the specified type. If the specified type and
the run-time type of the expression are the same, however, the run-time
performance of DirectCast is better than that of CType.
An example of a ctype and directcast.
In the preceding example, the run-time type of Q is Double. CType
succeeds because Double can be converted to Integer, but DirectCast
fails because the run-time type of Q is not already Integer
ctype(123.34,integer) - should it throw an error? Why or why not?
Answer1
It would work fine. As the runtime type of 123.34 would be double, and
Double can be converted to Integer.
Answer2
the ctype(123.34,integer) will work fine no errors
directcast(123.34,integer) - should it throw an error? Why or why
not?
It would throw an InvalidCast exception as the runtime type of 123.34
(double) doesnt match with Integer.
Difference between a sub and a function.
Answer1
A Sub does not return anything whereas a Function returns something.
Answer2
-A Sub Procedure is a method will not return a value
-A sub procedure will be defined with a “Sub” keyword
Sub ShowName(ByVal myName As String)
Console.WriteLine(”My name is: ” & myName)
End Sub
-A function is a method that will return value(s).
-A function will be defined with a “Function” keyword
Function FindSum(ByVal num1 As Integer, ByVal num2 As Integer) As
Integer
Dim sum As Integer = num1 + num2
Return sum
End Function
Explain manifest & metadata.
Answer1
Manifest is metadata about assemblies. Metadata is machine-readable
information about a resource, or “”data about data.” In .NET, metadata
includes type definitions, version information, external assembly
references, and other standardized information.
Answer2
Manifest: Manifest describes assembly itself. Assembly Name, version
number, culture, strong name, list of all files, Type references, and
referenced assemblies.
Metadata: Metadata describes contents in an assembly classes,
interfaces, enums, structs, etc., and their containing namespaces, the
name of each type, its visibility/scope, its base class, the nterfaces
it implemented, its methods and their scope, and each method’s
parameters, type’s properties, and so on.
Difference between imperative and interrogative code.
There are imperative and interrogative functions. Imperative functions
are the one which return a value while the interrogative functions do
not return a value.
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