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The using directive

You learned earlier that one of the benefits of the using directive is to eliminate the requirement to always type the namespace (such as System ) when referring to a class that belongs to that namespace. That is the purpose of the using directive at the top of Listing 2 .

However, there is another benefit that derives from the using directive that may be more important.

Memory management

One of the big issues in game programming (or any kind of programming that makes use of graphics files, sound files, or other large resource files) is tomake certain that the memory occupied by those resources is freed up as soon as the resource is no longer needed.

Without going into a lot of detail, the use of the using keyword inside the Main method in Listing 2 will assure that the Dispose method is called to free up all of the memory occupied by the Game1 object when control reaches the closing curly brace following the using keyword.

Don't modify the file named Program.cs

As an XNA game programmer, you shouldn't normally have any reason to modify the contents of the file named Program.cs . We need to leave it alone and modify the file named Game1.cs instead.

The Game1 class

I told you earlier that when you create a new Windows Game project, the file named Game1.cs is opened in the editor pane. Listing 3 shows the contents of that file.

Listing 3 . Initial contents of the file named Game1.cs.

using System; using System.Collections.Generic;using System.Linq; using Microsoft.Xna.Framework;using Microsoft.Xna.Framework.Audio; using Microsoft.Xna.Framework.Content;using Microsoft.Xna.Framework.GamerServices; using Microsoft.Xna.Framework.Graphics;using Microsoft.Xna.Framework.Input; using Microsoft.Xna.Framework.Media;namespace WindowsGame2 {///<summary>/// This is the main type for your game ///</summary>public class Game1 : Microsoft.Xna.Framework.Game {GraphicsDeviceManager graphics; SpriteBatch spriteBatch;public Game1() {graphics = new GraphicsDeviceManager(this); Content.RootDirectory = "Content";} ///<summary>/// Allows the game to perform any initialization/// it needs to before starting to run. /// This is where it can query for any required/// services and load any non-graphic /// related content. Calling base.Initialize/// will enumerate through any components /// and initialize them as well.///</summary>protected override void Initialize() {// TODO: Add your initialization logic here base.Initialize();} ///<summary>/// LoadContent will be called once per game and is the place to load /// all of your content.///</summary>protected override void LoadContent() {// Create a new SpriteBatch, which can be used to draw textures. spriteBatch = new SpriteBatch(GraphicsDevice);// TODO: use this.Content to load your game content here }///<summary>/// UnloadContent will be called once per game and is the place to unload /// all content.///</summary>protected override void UnloadContent() {// TODO: Unload any non ContentManager content here }///<summary>/// Allows the game to run logic such as updating the world, /// checking for collisions, gathering input, and playing audio.///</summary>///<param name="gameTime">Provides a snapshot of timing values.</param>protected override void Update(GameTime gameTime) {// Allows the game to exit if(GamePad.GetState(PlayerIndex.One).Buttons.Back==ButtonState.Pressed)this.Exit(); // TODO: Add your update logic herebase.Update(gameTime); }///<summary>/// This is called when the game should draw itself. ///</summary>///<param name="gameTime">Provides a snapshot of timing values.</param>protected override void Draw(GameTime gameTime) {GraphicsDevice.Clear(Color.CornflowerBlue); // TODO: Add your drawing code herebase.Draw(gameTime); }} }

Questions & Answers

what is Nano technology ?
Bob Reply
write examples of Nano molecule?
Bob
The nanotechnology is as new science, to scale nanometric
brayan
nanotechnology is the study, desing, synthesis, manipulation and application of materials and functional systems through control of matter at nanoscale
Damian
Is there any normative that regulates the use of silver nanoparticles?
Damian Reply
what king of growth are you checking .?
Renato
What fields keep nano created devices from performing or assimulating ? Magnetic fields ? Are do they assimilate ?
Stoney Reply
why we need to study biomolecules, molecular biology in nanotechnology?
Adin Reply
?
Kyle
yes I'm doing my masters in nanotechnology, we are being studying all these domains as well..
Adin
why?
Adin
what school?
Kyle
biomolecules are e building blocks of every organics and inorganic materials.
Joe
anyone know any internet site where one can find nanotechnology papers?
Damian Reply
research.net
kanaga
sciencedirect big data base
Ernesto
Introduction about quantum dots in nanotechnology
Praveena Reply
what does nano mean?
Anassong Reply
nano basically means 10^(-9). nanometer is a unit to measure length.
Bharti
do you think it's worthwhile in the long term to study the effects and possibilities of nanotechnology on viral treatment?
Damian Reply
absolutely yes
Daniel
how to know photocatalytic properties of tio2 nanoparticles...what to do now
Akash Reply
it is a goid question and i want to know the answer as well
Maciej
characteristics of micro business
Abigail
for teaching engĺish at school how nano technology help us
Anassong
Do somebody tell me a best nano engineering book for beginners?
s. Reply
there is no specific books for beginners but there is book called principle of nanotechnology
NANO
what is fullerene does it is used to make bukky balls
Devang Reply
are you nano engineer ?
s.
fullerene is a bucky ball aka Carbon 60 molecule. It was name by the architect Fuller. He design the geodesic dome. it resembles a soccer ball.
Tarell
what is the actual application of fullerenes nowadays?
Damian
That is a great question Damian. best way to answer that question is to Google it. there are hundreds of applications for buck minister fullerenes, from medical to aerospace. you can also find plenty of research papers that will give you great detail on the potential applications of fullerenes.
Tarell
what is the Synthesis, properties,and applications of carbon nano chemistry
Abhijith Reply
Mostly, they use nano carbon for electronics and for materials to be strengthened.
Virgil
is Bucky paper clear?
CYNTHIA
carbon nanotubes has various application in fuel cells membrane, current research on cancer drug,and in electronics MEMS and NEMS etc
NANO
so some one know about replacing silicon atom with phosphorous in semiconductors device?
s. Reply
Yeah, it is a pain to say the least. You basically have to heat the substarte up to around 1000 degrees celcius then pass phosphene gas over top of it, which is explosive and toxic by the way, under very low pressure.
Harper
Do you know which machine is used to that process?
s.
how to fabricate graphene ink ?
SUYASH Reply
for screen printed electrodes ?
SUYASH
What is lattice structure?
s. Reply
of graphene you mean?
Ebrahim
or in general
Ebrahim
in general
s.
Graphene has a hexagonal structure
tahir
On having this app for quite a bit time, Haven't realised there's a chat room in it.
Cied
how did you get the value of 2000N.What calculations are needed to arrive at it
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Source:  OpenStax, Xna game studio. OpenStax CNX. Feb 28, 2014 Download for free at https://legacy.cnx.org/content/col11634/1.6
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