C# Phone Screen Questions [Test your C# skills]

	Lets Play 20 quick C# questions which generally asked in most of the companies for screening candidates in first round of interview. Lets see how much you are aware of C#. Go through each questions and try to find answers yourself and match your answer with the correct answers given at the end of the post.
kind of type is a string? kind of type is a double? keyword defines a custom value type? Can a class have more than one direct base class? keyword makes a member visible to inherited classes? keyword makes a class visible only within its assembly? keyword allows a method to be overridden? keyword requires a method to be overridden? keyword prevents a class from being used as a base class? keyword returns true if a cast will succeed? keyword returns null if a cast will not succeed? keyword ensures code execution even if an exception occurs? keyword calls IDisposable.Dispose? keyword constrains a generic type argument to derive from a particular class? two keywords used together return IEnumerable? keyword would you use to define an inline variable in a LINQ query? keyword brings an extension method into scope? keyword do you add to a delegate to force subscribers to use += or –=? method do you call on a delegate to run it on a background thread? keyword provides thread synchronization?
Answers to questions
reference value struct no protected internal virtual abstract sealed is as finally using where yield return let using event BeginInvoke lock
* Thanks to Tony Sneed for providing such nice questions.