C# INTERVIEW QUESTIONS

Is there regular expression (regex) support available to C# developers?

Yes. The .NET class libraries provide support for regular expressions. Look at the documentation for the System.Text.RegularExpressions namespace.

Is there a way to force garbage collection?

Yes. Set all references to null and then call System.GC.Collect(). If you need to have some objects destructed, and System.GC.Collect() doesn't seem to be doing it for you, you can force finalizers to be run by setting all the references to the object to null and then calling System.GC.RunFinalizers().

Does C# support properties of array types?

Yes. Here's a simple example: using System;

class Class1

{

private string[] MyField;

public string[] MyProperty

{

get { return MyField; }

set { MyField = value; }

}

}

class MainClass

{

public static int Main(string[] args){

Class1 c = new Class1();

string[] arr = new string[] {"apple", "banana"};

c.MyProperty = arr;

Console.WriteLine(c.MyProperty[0]); // "apple"

return 0;

}

}

What connections does Microsoft SQL Server support?

Windows Authentication (via Active Directory) and SQL Server authentication (via Microsoft SQL Server username and passwords)

What is 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.

How is method overriding different from overloading?

When overriding, you change the method behavior for a derived class. Overloading simply involves having a method with the same name within the class.

When do you absolutely have to declare a class as abstract (as opposed to free-willed educated choice or decision based on UML diagram)?

When at least one of the methods in the class is abstract. When the class itself is inherited from an abstract class, but not all base abstract methods have been over-ridden.