C# Function

by Online Tutorials Library July 14, 2022

C# Function

Function is a block of code that has a signature. Function is used to execute statements specified in the code block. A function consists of the following components:

Function name: It is a unique name that is used to make Function call.

Return type: It is used to specify the data type of function return value.

Body: It is a block that contains executable statements.

Access specifier: It is used to specify function accessibility in the application.

Parameters: It is a list of arguments that we can pass to the function during call.

C# Function Syntax

Access-specifier, parameters and return statement are optional.

Let’s see an example in which we have created a function that returns a string value and takes a string parameter.

C# Function: using no parameter and return type

A function that does not return any value specifies void type as a return type. In the following example, a function is created without return type.

 using System; namespace FunctionExample {     class Program     {         // User defined function without return type         public void Show() // No Parameter         {             Console.WriteLine(“This is non parameterized function”);             // No return statement         }         // Main function, execution entry point of the program         static void Main(string[] args)         {             Program program = new Program(); // Creating Object             program.Show(); // Calling Function                    }     } } 

Output:

This is non parameterized function

C# Function: using parameter but no return type

 using System; namespace FunctionExample {     class Program     {         // User defined function without return type         public void Show(string message)         {             Console.WriteLine(“Hello ” + message);             // No return statement         }        // Main function, execution entry point of the program         static void Main(string[] args)         {             Program program = new Program(); // Creating Object             program.Show(“Rahul Kumar”); // Calling Function                    }     } } 

Output:

Hello Rahul Kumar

A function can have zero or any number of parameters to get data. In the following example, a function is created without parameters. A function without parameter is also known as non-parameterized function.

C# Function: using parameter and return type

 using System; namespace FunctionExample {     class Program     {         // User defined function         public string Show(string message)         {          Console.WriteLine(“Inside Show Function”);          return message;         }         // Main function, execution entry point of the program         static void Main(string[] args)         {             Program program = new Program();             string message = program.Show(“Rahul Kumar”);             Console.WriteLine(“Hello “+message);         }     } } 

Output:

Inside Show Function Hello Rahul Kumar

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