using System;

class Program

{

    static void Main()

    {

        float lengthFloat = 7.35f;

        // lose precision - explicit conversion

        int lengthInt = (int)lengthFloat;

        // no problem - implicit conversion

        double lengthDouble = lengthInt;

        Console.WriteLine("lengthInt = " + lengthInt);

        Console.WriteLine("lengthDouble = " + lengthDouble);

        Console.ReadKey();

    }

}

// Namespace Declaration

using System;

// Program start class

class NamedWelcome

{

    // Main begins program execution.

    static void Main(string[] args)

    {

        // Write to console

        Console.WriteLine("Hello, {0}!", args[0]);

        Console.WriteLine("Welcome to the C# Station Tutorial!"); 

    }

}

// Namespace Declaration

using System;

// Program start class

class WelcomeCSS

{

    // Main begins program execution.

    static void Main()

    {

        // Write to console

        Console.WriteLine("Welcome to the C# Station Tutorial!"); 

    }

}

MessageBox.Show( "Monitor Size:" +

   SystemInformation.PrimaryMonitorSize );

using Microsoft.Win32;

...

RegistryKey masterKey = Registry.LocalMachine.CreateSubKey

   ("SOFTWARE\\Test\\Preferences");

if (masterKey == null)

{

   Console.WriteLine ("Null Masterkey!");

}

else

{

   try

   {

      masterKey.SetValue ("MyKey", "MyValue");

   }

   catch (Exception ex)

   {

      Console.WriteLine (ex.Message);

   }

   finally

   { 

      masterKey.Close();

   }

}