Sunday, June 28, 2009

.NET Interview Questions - Part 7

1. Will finally block get executed if the exception had not occurred?


2. What’s the C# equivalent of C++ catch (…), which was a catch-all statement for any possible exception?

A catch block that catches the exception of type System.Exception. You can also omit the parameter data type in this case and just write catch {}.

3. Can multiple catch blocks be executed?

No, once the proper catch code fires off, the control is transferred to the finally block (if there are any), and then whatever follows the finally block.

4. Why is it a bad idea to throw your own exceptions?

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.

5. What’s a delegate?

A delegate object encapsulates a reference to a method. In C++ they were referred to as function pointers.

6. What’s a multicast delegate?

It’s a delegate that points to and eventually fires off several methods.

7. How’s the DLL Hell problem solved in .NET?

Assembly versioning allows the application to specify not only the library it needs to run (which was available under Win32), but also the version of the assembly.

8. What are the ways to deploy an assembly?

An MSI installer, a CAB archive, and XCOPY command.

9. What’s a satellite assembly?

When you write a multilingual or multi-cultural application in .NET, and want to distribute the core application separately from the localized modules, the localized assemblies that modify the core application are called satellite assemblies.

10. What namespaces are necessary to create a localized application?

1. System.Globalization
2. System.Resources.

11. What’s the difference between // comments, /* */ comments and /// comments?

Single-line, multi-line and XML documentation comments.

12. How do you generate documentation from the C# file commented properly with a command-line compiler?

Compile it with a /doc switch.

13. What’s the difference between <> and <> XML documentation tag?

Single line code example and multiple-line code example.

14. Is XML case-sensitive?

Yes, so <> and <> are different elements.

15. What debugging tools come with the .NET SDK?

CorDBG – command-line debugger, and DbgCLR – graphic debugger. Visual Studio .NET uses the DbgCLR. To use CorDbg, you must compile the original C# file using the /debug switch.

16. What does the This window show in the debugger?

It points to the object that’s pointed to by this reference. Object’s instance data is shown.

17. What does assert() do?

In debug compilation, assert takes in a Boolean condition as a parameter, and shows the error dialog if the condition is false. The program proceeds without any interruption if the condition is true.

18. What’s the difference between the Debug class and Trace class?

Documentation looks the same. Use Debug class for debug builds, use Trace class for both debug and release builds.

19. Why are there five tracing levels in System.Diagnostics.TraceSwitcher?

The tracing dumps can be quite verbose and for some applications that are constantly running you run the risk of overloading the machine and the hard drive there. Five levels range from None to Verbose, allowing to fine-tune the tracing activities.

20. Where is the output of TextWriterTraceListener redirected?

To the Console or a text file depending on the parameter passed to the constructor.

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