Your first C# program

Let's create your first C# program.

class Program
{
    static void Main(string[] args)
    {
        int i = 0;
        int j = 2;
        
        System.Console.WriteLine("i=" + i);
        System.Console.WriteLine("j=" + j);
    }
}

The output:

i=0
j=2

The code above defines two variables and output their values.

Compile the source code:

C# source files typically have the file extension .cs.

Save the code to Program.cs file and issue the csc command to compile it.

C:\g>csc Program.cs
Microsoft (R) Visual C# 2010 Compiler version 4.0.30319.1
Copyright (C) Microsoft Corporation. All rights reserved.

Check the output of the compiling:

C:\g>dir Program.exe
 Volume in drive C has no label.
 Volume Serial Number is 4047-6D6A

 Directory of C:\g

11/27/2010  11:04 AM             3,584 Program.exe
               1 File(s)          3,584 bytes
               0 Dir(s)  14,309,142,528 bytes free

C:\g>

Execute the Programm.exe.

C:\g>Program.exe
i=0
j=2

The C# compiler compiles the source code to assembly.

.net framework uses the assembly to package and deploy.

An assembly can be either an application(.exe file) or a library(.dll file).