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C# FunctionFunction 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 typeA 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 typeusing 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 typeusing 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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