Creating a new console application (Visual Studio) C# with Example
1. Open Visual Studio
2. In the toolbar, go to File → New Project
3. Select the Console Application project type
4. Open the ﬁle Program.cs in the Solution Explorer
5. Add the following code to Main():
public class Program
public static void Main()
// Prints a message to the console.
/* Wait for the user to press a key. This is a common
way to prevent the console window from terminating
and disappearing before the programmer can see the contents
of the window, when the application is run via Start from within VS. */
6. In the toolbar, click Debug -> Start Debugging or hit F5 or ctrl + F5 (running without debugger) to run the
Live Demo on ideone
class Program is a class declaration. The class Program contains the data and method deﬁnitions that your
program uses. Classes generally contain multiple methods. Methods deﬁne the behavior of the class.
However, the Program class has only one method: Main.
static void Main() deﬁnes the Main method, which is the entry point for all C# programs. The Main method
states what the class does when executed. Only one Main method is allowed per class.
System.Console.WriteLine("Hello, world!"); method prints a given data (in this example, Hello,
world!) as an output in the console window.
System.Console.ReadKey(), ensures that the program won't close immediately after displaying the message.
It does this by waiting for the user to press a key on the keyboard. Any key press from the user will terminate
the program. The program terminates when it has ﬁnished the last line of code in the main() method.
Using the command line
To compile via command line use either MSBuild or csc.exe (the C# compiler), both part of the Microsoft Build Tools
To compile this example, run the following command in the same directory where HelloWorld.cs is located:
It can also be possible that you have two main methods inside one application. In this case, you have to tell the
compiler which main method to execute by typing the following command in the console.(suppose Class ClassA
also has a main method in the same HelloWorld.cs ﬁle in HelloWorld namespace)
%WINDIR%\\Microsoft.NET\\Framework64\\v4.0.30319\\csc.exe HelloWorld.cs /main:HelloWorld.ClassA
where HelloWorld is namespace
Note: This is the path where .NET framework v4.0 is located in general. Change the path according to your .NET version.
In addition, the directory might be framework instead of framework64 if you're using the 32-bit .NET Framework. From
the Windows Command Prompt, you can list all the csc.exe Framework paths by running the following commands (the ﬁrst
for 32-bit Frameworks):
dir %WINDIR%\\Microsoft.NET\\Framework\\csc.exe /s/b
dir %WINDIR%\\Microsoft.NET\\Framework64\\csc.exe /s/b
There should now be an executable ﬁle named HelloWorld.exe in the same directory. To execute the program
from the command prompt, simply type the executable's name and hit as follows:
This will produce:
You may also double click the executable and launch a new console window with the message "Hello, world!"