c# - Completely remove a picturebox from project? -


i have project in dynamically create pictureboxes run 1 side of screen another. user needs click pictureboxes and, when clicked, dissapear. however, if picturebox gets 1 side of screen another, life lost. problem is, lives seem dissapear randomly. suspect because pictureboxes aren't removed project , somehow keep travelling after clicked them. code. thank :).

//the movement timer 

    private void timermovement_tick(object sender, eventargs e)       {         int i;         (i = 0; < zombie.count(); i++)         {             int x = zombie[i].img.location.x;             int y = zombie[i].img.location.y;             if (zombie[i].loc == 0)             {                 x = x + 10;                 if (zombie[i].img.location.x > 1200 && zombie[i].img != null)                 {                     zombie[i].img.dispose();                     this.controls.remove(zombie[i].img);                     label5.text = convert.tostring(zombies_total - zombies_killed - 1);                     life_remove();                     label7.text = convert.tostring(i);                 }             }             else             {                 x = x - 6;                 if (zombie[i].img.location.x < -100 && zombie[i].img != null)                 {                     zombie[i].img.dispose();                     this.controls.remove(zombie[i].img);                     label5.text = convert.tostring(zombies_total - zombies_killed - 1);                     life_remove();                     label7.text = convert.tostring(i);                 }             }             point p = new point(x, y);             zombie[i].img.location = new point(x, y);       }

//life removal

    private void life_remove()     {         if (pictureboxlife1.visible == true)             pictureboxlife1.visible = false;         else             if (pictureboxlife2.visible == true)                 pictureboxlife2.visible = false;             else                 if (pictureboxlife3.visible == true)                     pictureboxlife3.visible = false;     }


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