What is the difference between an EXE and a DLL?
An EXE can run independently, whereas DLL will run
within an EXE. DLL is an in-process file and EXE is an
out-process file
What is strong-typing versus weak-typing? Which is
preferred? Why?
Strong type is checking the types of variables as soon
as possible, usually at compile time. While weak typing
is delaying checking the types of the system as late as
possible, usually to run-time. Which is preferred
depends on what you want. For scripts & quick stuff
you’ll usually want weak typing, because you want to
write as much less code as possible. In big programs,
strong typing can reduce errors at compile time.
What are PDBs? Where must they be located for debugging
to work?
Answer1:
To debug precompiled components such as business objects
and code-behind modules, you need to generate debug
symbols. To do this, compile the components with the
debug flags by using either Visual Studio .NET or a
command line compiler such as Csc.exe (for Microsoft
Visual C# .NET) or Vbc.exe (for Microsoft Visual Basic .NET).
Using Visual Studio .NET
1. Open the ASP.NET Web Application project in Visual
Studio .NET.
2. Right-click the project in the Solution Explorer and
click Properties.
3. In the Properties dialog box, click the Configuration
Properties folder.
4. In the left pane, select Build.
5. Set Generate Debugging Information to true.
6. Close the Properties dialog box.
7. Right-click the project and click Build to compile
the project and generate symbols (.pdb files).
Answer2:
A program database (PDB) file holds debugging and
project state information that allows incremental
linking of a Debug configuration of your program.
The linker creates project.PDB, which contains debug
information for the project’s EXE file. The project.PDB
contains full debug information, including function
prototypes, not just the type information found in
VCx0.PDB. Both PDB files allow incremental updates.
They should be located at bin\Debug directory
What is cyclomatic complexity and why is it important?
Cyclomatic complexity is a computer science metric
(measurement) developed by Thomas McCabe used to
generally measure the complexity of a program. It
directly measures the number of linearly independent
paths through a program’s source code.
The concept, although not the method, is somewhat
similar to that of general text complexity measured by
the Flesch-Kincaid Readability Test.
Cyclomatic complexity is computed using a graph that
describes the control flow of the program. The nodes of
the graph correspond to the commands of a program. A
directed edge connects two nodes, if the second command
might be executed immediately after the first command.
By definition,
CC = E - N + P
where
CC = cyclomatic complexity
E = the number of edges of the graph
N = the number of nodes of the graph
P = the number of connected components.
What is FullTrust? Do GAC’ed assemblies have FullTrust?
Your code is allowed to do anything in the framework,
meaning that all (.Net) permissions are granted. The GAC
has FullTrust because it’s on the local HD, and that has
FullTrust by default, you can change that using caspol
What does this do? gacutil /l | find /i “about”
Answer1:
This command is used to install strong typed assembly in
GAC
Answer2:
gacutil.exe is used to install strong typed assembly in
GAC. gacutil.exe /l is used to lists the contents of the
global assembly cache. |(pipe) symbol is used to filter
the output with another command. find /i “about” is to
find the text “about” on gacutil output. If any lines
contains the text “about” then that line will get
displayed on console window.
Contrast OOP and SOA. What are tenets of each
Service Oriented Architecture. In SOA you create an
abstract layer that your applications use to access
various “services” and can aggregate the services. These
services could be databases, web services, message
queues or other sources. The Service Layer provides a
way to access these services that the applications do
not need to know how the access is done. For example, to
get a full customer record, I might need to get data
from a SGL Server database, a web service and a message
queue. The Service layer hides this from the calling
application. All the application knows is that it asked
for a full customer record. It doesn’t know what system
or systems it came from or how it was retrieved.
How does the XmlSerializer work? What ACL permissions
does a process using it require?
XmlSerializer requires write permission to the system’s
TEMP directory.
Why is catch(Exception) almost always a bad idea?
Well, if at that point you know that an error has
occurred, then why not write the proper code to handle
that error instead of passing a new Exception object to
the catch block? Throwing your own exceptions signifies
some design flaws in the project.
What is the difference between Debug. Write and
Trace. Write? When should each be used?
Answer1:
The Debug. Write call won’t be compiled when the DEBUG
symbol is not defined (when doing a release build).
Trace. Write calls will be compiled. Debug. Write is for
information you want only in debug builds, Trace. Write
is for when you want it in release build as well. And in
any case, you should use something like log4net because
that is both faster and better
Answer2:
Debug. Write & Trace. write - both works in Debug mode,
while in Release Mode,Trace.write only will work .Try
changing the Active Config property of Solution in
Property page nd find the difference. Debug.write is
used while debugging a project and Trace.write is used in
Released version of Applications.
What is the difference between a Debug and Release
build? Is there a significant speed difference? Why or
why not?
Debug build contain debug symbols and can be debugged
while release build doesn’t contain debug symbols,
doesn’t have [Conational(”DEBUG”)] methods calls
compiled, can’t be debugged (easily, that is), less
checking, etc. There should be a speed difference,
because of disabling debug methods, reducing code size
etc but that is not a guarantee (at least not a
significant one)
Contrast the use of an abstract base class against an
interface?
Answer1:
In the interface all methods must be abstract, in the
abstract class some methods can be concrete. In the
interface no accessibility modifiers are allowed, which
is ok in abstract classes
Answer2:
Whether to Choose VB.NET/C#.
Both the languages are using same classes and namespaces.
Once it compile and generates MSIL, there is no meaning
of which language it was written. If you are Java/C++
programmer better to choose C# for same coding style
otherwise you can choose VB.net.
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