Method declaration and calling in C Sharp (C#) - Cheat Sheet & Quick Revision

Recall & Review

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What is a method in C#?

A method is a block of code that performs a specific task. It can be called to run that task whenever needed.

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How do you declare a method that returns no value in C#?

Use the void keyword before the method name. For example: <br>

void SayHello() { Console.WriteLine("Hello!"); }

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How do you call a method named Greet in C#?

Simply write the method name followed by parentheses: <br>

Greet();

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What is the purpose of method parameters?

Parameters let you send information into a method so it can use that data to do its job.

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How do you declare a method that returns an integer value?

Specify the return type before the method name. For example: <br>

int GetNumber() { return 5; }

Which keyword is used to declare a method that does not return any value?

A null

B int

C return

D void

The keyword void means the method does not return any value.

How do you call a method named DisplayMessage?

A DisplayMessage;

B DisplayMessage();

C method DisplayMessage();

D call DisplayMessage;

To call a method, write its name followed by parentheses.

What does a method parameter do?

A Sends data into the method

B Returns data from the method

C Stops the method

D Names the method

Parameters allow you to send information into a method.

Which part of a method declaration specifies the type of value it returns?

A Return type before the method name

B Method name

C Parameters inside parentheses

D Method body inside braces

The return type is written before the method name to show what type of value the method returns.

What happens if a method has a return type other than void?

A It cannot be called

B It cannot have parameters

C It must return a value of that type

D It must be static

Methods with a return type other than void must return a value of that type.

Explain how to declare and call a simple method in C# that prints a message.

Think about the method header, body, and how you run it.

Describe the role of parameters and return types in methods.

Consider how methods communicate with the outside.