arrays - Is there a way to avoid writing duplicate code in C#? -

i insert more balls form. however, in order allow bounce have code same algorithm on , on again different ball. may know there way can without writing on , on again? codes have below.

int bba1; //the x axis upper left corner int bba2; //the y axis upper left corner  int spdbba1; //the change of x int spdbba2; //the change of y  public startgame() {     initializecomponent(); }  private void startgame_load(object sender, eventargs e) {     //loads ball on screen @ bottom of window     bba1 = this.clientsize.width / 5; //the x axis ball loaded @     bba2 = this.clientsize.height - 10; //the y axis ball loaded @     spdbba1 = 1; //the speed of ball of y     spdbba2 = 1; //the speed of ball of x }  private void startgame_paint_1(object sender, painteventargs e) {     //this inner paint color of circle 10 10     e.graphics.fillellipse(brushes.blue, bba1, bba2, 10, 10);     //this outline paint color of circle 10 10     e.graphics.drawellipse(pens.blue, bba1, bba2, 10, 10);  }  private void timer1_tick(object sender, eventargs e) {     bba2 = bba2 + spdbba2;     bba1 = bba1 + spdbba1;      if (bba2 < 0)     {         spdbba2 = -spdbba2; //if y less 0 changes direction     }     else if (bba1 < -5)     {         spdbba1 = -spdbba1;     }     else if (bba2 + 10 > this.clientsize.height)     {         // if y + 10, radius of circle greater         // form width change direction         spdbba2 = -spdbba2;     }     else if (bba1 + 10 > this.clientsize.width)     {         spdbba1 = -spdbba1;     }      this.invalidate();  } 

thank you.

yes can! 1 of many cool features of object oriented programming.

create ball class. when start game create balls need , store them in list. there can use foreach loops modify properties of each of ball objects.

public class ball {     public int speedx { get; private set; }     public int speedy { get; private set; }     public int positionx { get; private set; }     public int positiony { get; private set; }      public ball(int speedx, int speedy, int positionx, int positiony)     {         this.speedx = speedx;         this.speedy = speedy;         this.positionx = positionx;         this.positiony = positiony;     }      public int setspeedx(int newspeed)     {         this.speedx = newspeed;     }      //add other setters need. }  

now have blueprint balls need create. in game can this:

public class startgame {     public list<ball> balllist { get; private set; }      public startgame()     {         this.balllist = new list<ball>();         initializecomponent();     }      private void startgame_load(object sender, eventargs e)     {         //add balls need here.         balllist.add(new ball(5, 10, 1, 1));         balllist.add(new ball(2, 17, 2, 9));         balllist.add(new ball(4, 12, 7, 5));     }      private void startgame_paint_1(object sender, painteventargs e)     {         //this foreach loop run through balls in balllist         foreach(ball ball in balllist)         {             e.graphics.fillellipse(brushes.blue, ball.positionx, ball.positiony, 10, 10);             e.graphics.drawellipse(pens.blue, ball.positionx, ball.positiony, 10, 10);         }     } } 

i wasn't 100% sure how game worked made guesses variables hope idea.