How to create solid object in my game.

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;
using Microsoft.Xna.Framework.Net;
using Microsoft.Xna.Framework.Storage;
using System.Xml;
using System.Xml.Serialization;
using System.IO;
using System;
using System.Collections.Generic;
using System.Linq;
 
namespace WindowsGame1
{
    public class Game1 : Microsoft.Xna.Framework.Game
    {
        GraphicsDeviceManager graphics;
        SpriteBatch spriteBatch;
 
        //Global Variable Declarations
        Texture2D backgroundTexture;
        Texture2D sprite; 
        Texture2D sprite1;
        Point frameCounter = new Point(0,0);  
        Point frameCounter1 = new Point(0, 0);
        Vector2 position = Vector2.Zero; 
        Vector2 speed = Vector2.Zero; 
        SpriteEffects se =SpriteEffects.FlipHorizontally; 
 
        
        double frameDelay = 0.1; 
        double frameDelay1 = 0.5;
        Level level; //xml level code that will be serialized into this object
        SpriteFont spriteFont;
 
        public Game1()
        {
            graphics = new GraphicsDeviceManager(this);
            Content.RootDirectory = "Content";
        }
 
        protected override void Initialize()
        {
            XmlSerializer s = new XmlSerializer(typeof(Level));
            TextReader r = new StreamReader("Content/Level.xml");
 
            level = (Level)s.Deserialize(r);
 
            r.Close();
 
            
            foreach (Level.character c in level.allCharacters)
            {
                c.sprite = Content.Load<Texture2D>(c.textureAsset);
                c.bound = new BoundingSphere(new Vector3(c.position , 0), 50);
            }
 
            base.Initialize();
        }
 
        protected override void LoadContent()
        {
            // Create a new SpriteBatch, which can be used to draw textures.
            spriteBatch = new SpriteBatch(GraphicsDevice);
            spriteFont = Content.Load<SpriteFont>("Arial");
 
            backgroundTexture = Content.Load<Texture2D>("Background");
            sprite = Content.Load<Texture2D>("Boy");
            sprite1 = Content.Load<Texture2D>("Tree");
 
 
	    //================= Help me here ============================
	    //
            //create new sprite here called Fence or wall
            //png file will be added into the content called Fence.png
 
 
 
        }
 
        protected override void UnloadContent()
        {
        }
 
        protected override void Update(GameTime gameTime)
        {
 
            KeyboardState kb = new KeyboardState();
            kb = Keyboard.GetState();   
            speed = Vector2.Zero;       
            bool moving = false;         
 
            if (kb.IsKeyDown(Keys.Right))
            {
                
                speed.X = 2;
                moving = true;
                
                se = SpriteEffects.FlipHorizontally;
                frameCounter.Y = 0;
            }
            if (kb.IsKeyDown(Keys.Up))
            {
                speed.Y = -2;
                moving = true;
                frameCounter.Y = sprite.Height * 2 / 3;
            }
            if (kb.IsKeyDown(Keys.Left))
            {
                speed.X = -2;
                moving = true;
                
                se = SpriteEffects.None;
                frameCounter.Y = 0;
            }
            if (kb.IsKeyDown(Keys.Down))
            {
                speed.Y = 2;
                moving = true;
                frameCounter.Y = sprite.Height / 3;
            }
            
            position += speed;
 
            if (moving)  
            {
                
                frameDelay -= gameTime.ElapsedGameTime.TotalSeconds;
                if (frameDelay < 0)
                {
                    
                    frameDelay = 0.1;
                    frameCounter.X += sprite.Width / 8; 
                    if (frameCounter.X >= sprite.Width) frameCounter.X = 0; 
                }
            }
            frameDelay1 -= gameTime.ElapsedGameTime.TotalSeconds;
            if (frameDelay1 < 0)
            {
                
                frameDelay1 = 0.5;
                frameCounter1.X += sprite1.Width / 5; 
                if (frameCounter1.X >= sprite1.Width) frameCounter1.X = 0; 
            }
            base.Update(gameTime);
        }
 
        protected override void Draw(GameTime gameTime)
        {
            GraphicsDevice.Clear(Color.Green);
            spriteBatch.Begin();
 
            //Draw Background (Background with trees, rock, garden etc...)
            spriteBatch.Draw(backgroundTexture, new Rectangle(0,0,Window.ClientBounds.Width, Window.ClientBounds.Height), null, Color.White, 0, Vector2.Zero, SpriteEffects.None, 0);
            
            //Draw Sprite1 (Tree)
            spriteBatch.Draw(sprite1, new Vector2(300, 500), new Rectangle(frameCounter1.X, frameCounter1.Y, sprite1.Width / 6, sprite1.Height), Color.White, 0, Vector2.Zero, 1, SpriteEffects.None, 0);
            
            //Draw Sprite (Boy character)
            spriteBatch.Draw(sprite, position, new Rectangle(frameCounter.X, frameCounter.Y, sprite.Width/8, sprite.Height/3), Color.White,0,Vector2.Zero,1,se,0);
 
	    
 
	    //================= Help me here ============================
	    //
            //Draw new sprite (Fence)
            //The boy cannot past through the fence
 
 
            //create a bounding sphere at the players current position
            BoundingSphere playerSphere = new BoundingSphere(new Vector3(position,0),1);
            
            //In this loop we draw each Male/Female character...
            foreach (Level.character c in level.allCharacters)
            {
                spriteBatch.Draw(c.sprite, c.position, new Rectangle(0, 0, c.sprite.Height, c.sprite.Height), Color.White, 0, Vector2.Zero,c.scale, SpriteEffects.None, 0);
                
                if (c.bound.Intersects(playerSphere))
                {
                    
                    spriteBatch.DrawString(spriteFont, c.greeting, (c.position + new Vector2(10, -10)), Color.White);
                }
 
            }
            spriteBatch.End();
            base.Draw(gameTime);
        }
    }
}

                                  

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