Thursday, September 27, 2007

C# Interview Questions -4

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

Question Can multiple catch blocks be executed?
Answer: 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.

Question Why is it a bad idea to throw your own exceptions?
Answer: 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.

Question What’s a delegate?
Answer: A delegate object encapsulates a reference to a method. In C++ they were referred to as function pointers.

Question What’s a multicast delegate?
Answer: It’s a delegate that points to and eventually fires off several methods.

Question How’s the DLL Hell problem solved in .NET?
Answer: 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.

Question What are the ways to deploy an assembly?
Answer: An MSI installer, a CAB archive, and XCOPY command.

Question What’s a satellite assembly?
Answer: 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.

Question What namespaces are necessary to create a localized application?
Answer: System.Globalization, System.Resources.

Question What’s the difference between // comments, /* */ comments and /// comments?
Answer: Single-line, multi-line and XML documentation comments.

Question How do you generate documentation from the C# file commented properly with a command-line compiler?
Answer: Compile it with a /doc switch.

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