c# - Enemy sprite going black XNA -

i'm doing simple tower defense game on xna , i'm having trouble. have enemy sprite should green, image correct, when insert on program appears black, in right shape. here's code (sorry it's mess):

namespace microdefense {     public class game1 : microsoft.xna.framework.game     {      graphicsdevicemanager graphics;     spritebatch spritebatch;      enum gamestate     {         mainmenu,         options,         playing,     }     gamestate currentgamestate = gamestate.mainmenu;      // screen adjustments     int screenwidth = 800, screenheight = 600;      cbutton btnplay;      level level = new level();      wavemanager wavemanager;      player player;      gui.button arrowbutton;     gui.button spikebutton;     gui.button slowbutton;      gui.toolbar toolbar;      public game1()     {         graphics = new graphicsdevicemanager(this);         content.rootdirectory = "content";          // width of level in pixels         graphics.preferredbackbufferwidth = level.width * 32;         // height of toolbar + height of level in pixels         graphics.preferredbackbufferheight = 32 + level.height * 32;          graphics.applychanges();          ismousevisible = true;     }      protected override void initialize()     {          base.initialize();     }      protected override void loadcontent()     {          spritebatch = new spritebatch(graphicsdevice);          // screen stuff         graphics.preferredbackbufferwidth = screenwidth;         graphics.preferredbackbufferheight = screenheight;         graphics.applychanges();         ismousevisible = true;          btnplay = new cbutton(content.load<texture2d>("button"), graphics.graphicsdevice);         btnplay.setposition(new vector2(350, 300));           texture2d topbar = content.load<texture2d>("tool bar");         spritefont font = content.load<spritefont>("arial");          toolbar = new gui.toolbar(topbar, font, new vector2(0, level.height * 32));          texture2d grass = content.load<texture2d>("grass");         texture2d path = content.load<texture2d>("path");          level.addtexture(grass);         level.addtexture(path);          texture2d bullettexture = content.load<texture2d>("bullet");          texture2d[] towertextures = new texture2d[]         {             content.load<texture2d>("arrow tower"),             content.load<texture2d>("spike tower"),             content.load<texture2d>("slow tower"),         };          player = new player(level, towertextures, bullettexture);          texture2d enemytexture = content.load<texture2d>("enemy");         texture2d healthtexture = content.load<texture2d>("health bar");          wavemanager = new wavemanager(player, level, 24, enemytexture,                                                          healthtexture);          // "normal" texture arrow button.         texture2d arrownormal = content.load<texture2d>("gui\\arrow tower\\arrow button");         // "mouseover" texture arrow button.         texture2d arrowhover = content.load<texture2d>("gui\\arrow tower\\arrow hover");         // "pressed" texture arrow button.         texture2d arrowpressed = content.load<texture2d>("gui\\arrow tower\\arrow pressed");          // "normal" texture spike button.         texture2d spikenormal = content.load<texture2d>("gui\\spike tower\\spike button");         // "mouseover" texture spike button.         texture2d spikehover = content.load<texture2d>("gui\\spike tower\\spike hover");         // "pressed" texture spike button.         texture2d spikepressed = content.load<texture2d>("gui\\spike tower\\spike pressed");          // "normal" texture slow button.         texture2d slownormal = content.load<texture2d>("gui\\slow tower\\slow button");         // "mouseover" texture slow button.         texture2d slowhover = content.load<texture2d>("gui\\slow tower\\slow hover");         // "pressed" texture slow button.         texture2d slowpressed = content.load<texture2d>("gui\\slow tower\\slow pressed");          // initialize arrow button.         arrowbutton = new gui.button(arrownormal, arrowhover,             arrowpressed, new vector2(0, level.height * 32));          // initialize spike button.         spikebutton = new gui.button(spikenormal, spikehover,             spikepressed, new vector2(32, level.height * 32));          // initialize slow button.         slowbutton = new gui.button(slownormal, slowhover,             slowpressed, new vector2(32 * 2, level.height * 32));          //arrowbutton.clicked += new eventhandler(arrowbutton_clicked);         //spikebutton.clicked += new eventhandler(spikebutton_clicked);         //slowbutton.clicked += new eventhandler(slowbutton_clicked);          arrowbutton.onpress += new eventhandler(arrowbutton_onpress);         spikebutton.onpress += new eventhandler(spikebutton_onpress);         slowbutton.onpress += new eventhandler(slowbutton_onpress);     }      protected override void unloadcontent()     {      }      private void arrowbutton_clicked(object sender, eventargs e)     {         player.newtowertype = "arrow tower";         player.newtowerindex = 0;     }     private void spikebutton_clicked(object sender, eventargs e)     {         player.newtowertype = "spike tower";         player.newtowerindex = 1;     }     private void slowbutton_clicked(object sender, eventargs e)     {         player.newtowertype = "slow tower";         player.newtowerindex = 2;     }      private void arrowbutton_onpress(object sender, eventargs e)     {         player.newtowertype = "arrow tower";         player.newtowerindex = 0;     }     private void spikebutton_onpress(object sender, eventargs e)     {         player.newtowertype = "spike tower";         player.newtowerindex = 1;     }     private void slowbutton_onpress(object sender, eventargs e)     {         player.newtowertype = "slow tower";         player.newtowerindex = 2;     }      public vector2 size;      protected override void update(gametime gametime)     {         mousestate mouse = mouse.getstate();         switch (currentgamestate)         {             case gamestate.mainmenu:                 if (btnplay.isclicked == true) currentgamestate = gamestate.playing;                 btnplay.update(mouse);                 if (cbutton.control)                 {                     graphics.preferredbackbufferheight = 288;                     graphics.preferredbackbufferwidth = 256;                     graphics.applychanges();                 }                 break;              case gamestate.playing:                 player.update(gametime, wavemanager.enemies);             wavemanager.update(gametime);               //update arrow button.             arrowbutton.update(gametime);             //update spike button.             spikebutton.update(gametime);             //update slow button.             slowbutton.update(gametime);                 break;         }          base.update(gametime);     }      protected override void draw(gametime gametime)     {         graphicsdevice.clear(color.cornflowerblue);          spritebatch.begin();          switch (currentgamestate)         {             case gamestate.mainmenu:                 spritebatch.draw(content.load<texture2d>("mainmenu"), new rectangle(0, 0, screenwidth, screenheight), color.white);                 btnplay.draw(spritebatch);                 break;              case gamestate.playing:                 level.draw(spritebatch);                 player.draw(spritebatch);                 wavemanager.draw(spritebatch);                  // draw tool bar first,                 toolbar.draw(spritebatch, player);                 // , our buttons.                 arrowbutton.draw(spritebatch);                 spikebutton.draw(spritebatch);                 slowbutton.draw(spritebatch);                  player.drawpreview(spritebatch);                 break;         }         spritebatch.end();          base.draw(gametime);     } } 

}

edit1:the sprite has right shape color black.

edit2: here's wave manager:

public class wavemanager {     private int numberofwaves; // how many waves game have     private float timesincelastwave; // how long since last wave ended      private queue<wave> waves = new queue<wave>(); // queue of our waves      private texture2d enemytexture; // texture used draw enemies      private bool wavefinished = false; // current wave over?      private level level; // reference our level class.      public wave currentwave // wave @ front of queue     {         { return waves.peek(); }     }     public list<enemy> enemies // list of current enemeies     {         { return currentwave.enemies; }     }     public int round // returns wave number     {         { return currentwave.roundnumber + 1; }     }      public wavemanager(player player, level level, int numberofwaves,         texture2d enemytexture, texture2d healthtexture)     {         this.numberofwaves = numberofwaves;         this.enemytexture = enemytexture;          this.level = level;          (int = 0; < numberofwaves; i++)         {             int initialnumerofenemies = 6;//número de inimigos por wave <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<             int numbermodifier = (i / 6) + 1;              // pass reference player, wave class.             wave wave = new wave(i, initialnumerofenemies * numbermodifier,                 player, level, enemytexture, healthtexture);              waves.enqueue(wave);         }          startnextwave();     }      private void startnextwave()     {         if (waves.count > 0) // if there still waves left         {             waves.peek().start(); // start next 1              timesincelastwave = 0; // reset timer             wavefinished = false;         }     }      public void update(gametime gametime)     {         currentwave.update(gametime); // update wave          if (currentwave.roundover) // check if has finished         {             wavefinished = true;         }          if (wavefinished) // if has finished         {             timesincelastwave += (float)gametime.elapsedgametime.totalseconds; // start timer         }          if (timesincelastwave > 10.0f) // if 10 seconds has passed tempo entre waves <<<<<<<<<<<<<         {             waves.dequeue(); // remove finished wave             startnextwave(); // start next wave         }     }      public void draw(spritebatch spritebatch)     {         currentwave.draw(spritebatch);     } } 

without seeing wave class can't guess draw function looks this:

spritebatch.draw(   content.load<texture2d>("wave"),    new rectangle(0, 0, width, height),    color.black); 

when should (note change in color):

spritebatch.draw(   content.load<texture2d>("wave"),    new rectangle(0, 0, width, height),    color.white);