Method declaration and calling in C Sharp (C#) - Step-by-Step Execution

Concept Flow - Method declaration and calling

Start Program

↓

Declare Method

↓

Main Method Calls Method

↓

Execute Method Body

↓

Return to Main

↓

Program Ends

The program starts by declaring a method, then the main method calls it, the method runs, and control returns to main.

Execution Sample

C Sharp (C#)

using System;
class Program {
  static void SayHello() {
    Console.WriteLine("Hello, friend!");
  }
  static void Main() {
    SayHello();
  }
}

This code declares a method SayHello and calls it from Main to print a greeting.

Execution Table

Step	Action	Evaluation	Output
1	Program starts	No output
2	Method SayHello declared	No output
3	Main method starts	No output
4	Main calls SayHello()	Call method
5	SayHello executes Console.WriteLine	Prints string	Hello, friend!
6	SayHello returns to Main	No output
7	Main ends	Program ends

💡 Program ends after Main finishes execution

Variable Tracker

Variable	Start	After Call	Final
No variables	N/A	N/A	N/A

Key Moments - 2 Insights

Why doesn't the method run when it is declared?

Declaring a method only tells the program what it does. It runs only when called, as shown in step 4 of the execution table.

What happens after the method finishes running?

After the method finishes (step 6), control returns to the place where it was called (Main method), continuing the program.

Visual Quiz - 3 Questions

Look at the execution table, what is printed at step 5?

A "Hello, friend!"

B "SayHello"

C Nothing is printed

D "Main method starts"

💡 Hint

Check the Output column at step 5 in the execution table.

At which step does the program call the method SayHello?

A Step 2

B Step 6

C Step 4

D Step 7

💡 Hint

Look at the Action column to find when SayHello is called.

If we remove the call SayHello() in Main, what changes in the execution table?

A Step 2 disappears

B Step 5 output disappears

C Program ends earlier at step 4

D No change at all

💡 Hint

Without calling SayHello, the method body does not run, so no output is printed.

Concept Snapshot

Method declaration syntax:
static void MethodName() {
  // code
}

Call method by name:
MethodName();

Methods run only when called.
After running, control returns to caller.

Full Transcript

This example shows how to declare a method named SayHello and call it from the Main method. The program starts, declares the method, then Main calls SayHello. The method runs and prints "Hello, friend!". After that, control returns to Main, and the program ends. Declaring a method does not run it; it runs only when called. After the method finishes, the program continues from where it left off.