C# Online Test

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The C# online test assesses candidates' knowledge of programming in the C# language and their ability to leverage commonly used parts of the .NET framework's class library.

It's an ideal test for pre-employment screening. A good C# developer needs to be able not only to solve problems using C# but also recognize when to leverage the functionality provided by the .NET framework's class library to write robust and maintainable code.

This online test requires candidates to solve coding problems in C# and find and fix bugs in a C# program.

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Sample Free Questions

Alert Service


C# Interfaces Inversion of control Refactoring Public

Refactor the AlertService and AlertDAO classes:

  • Create a new interface, named IAlertDAO, that contains the same methods as AlertDAO.
  • AlertDAO should implement the IAlertDAO interface.
  • AlertService should have a constructor that accepts IAlertDAO.
  • The RaiseAlert and GetAlertTime methods should use the object passed through the constructor.

Merge Names


C# Arrays Public

Implement the UniqueNames method. When passed two arrays of names, it will return an array containing the names that appear in either or both arrays. The returned array should have no duplicates.

For example, calling MergeNames.UniqueNames(new string[]{'Ava', 'Emma', 'Olivia'}, new string[]{'Olivia', 'Sophia', 'Emma'}) should return an array containing Ava, Emma, Olivia, and Sophia in any order.

User Input


C# Inheritance OOP Public

User interface contains two types of user input controls: TextInput, which accepts all characters and NumericInput, which accepts only digits.

Implement the class TextInput that contains:

  • Public method void Add(char c) - adds the given character to the current value
  • Public method string GetValue() - returns the current value

Implement the class NumericInput that:

  • Inherits TextInput
  • Overrides the Add method so that each non-numeric character is ignored

For example, the following code should output "10":

TextInput input = new NumericInput();
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