Problem with Managed c# Rendering Meshes order

[leandra]

HI im new in directx
i have previosly made a game in directx c++ and wanted to try using managed c#
and i have a BIIIGGGG PROBLEMMMM and I cant see what it is .
my problem is that I have 2 meshes one in (0,0,1) coordinate and the other one in (0,0,-3) and my camara is in (0,0,5) and when i render them the last mesh that is the fardest(0,0,-3) i see it in front of the first mesh(0,0,1),
its like the device doesnt use the Zbuffer for ordering my meshes
and I have it enable: device.RenderState.Zbuffer = true;
I dont understand WHY is it rendering in the order the meshes are getting to the effect , the device is not ordering my meshes and I cant figure it out.
PLS HELP ME , what am I doing wrong?????
here is the code::::::::::

		public Device device;
		public ExtendedMaterial[] materials;
		public Material[] meshMaterials ;
		public Texture[] meshTextures ;
		public ExtendedMaterial[] materials2;
		public Material[] meshMaterials2 ;
		public Texture[] meshTextures2 ;
		Effect effect,effect2;
		Mesh m,m2;

		public Form1()
		{
			this.SetStyle(ControlStyles.AllPaintingInWmPaint | ControlStyles.Opaque, true);	
			InitializeComponent();
		}
		#region Windows Form Designer generated code
		/// <summary>
		/// Required method for Designer support - do not modify
		/// the contents of this method with the code editor.
		/// </summary>
		private void InitializeComponent()
		{
			this.components = new System.ComponentModel.Container();
			this.Size = new System.Drawing.Size(300,300);
			this.Text = "Form1";
		}
		#endregion

		/// <summary>
		/// The main entry point for the application.
		/// </summary>
		[STAThread]
		static void Main() 
		{
			using (Form1 frm = new Form1())
			{
				frm.Show();
				frm.InitializeDevice();
				Application.Run(frm);
			}
		}
		public void InitializeDevice()
		{
			PresentParameters presentParams = new PresentParameters();
			presentParams.Windowed = true;
			presentParams.SwapEffect = SwapEffect.Discard;
			device = new Microsoft.DirectX.Direct3D.Device(0, Microsoft.DirectX.Direct3D.DeviceType.Hardware, this, CreateFlags.HardwareVertexProcessing, presentParams);
			effect = Effect.FromFile(device,"simple.fx",null, null, ShaderFlags.None,null);
			effect2 = Effect.FromFile(device,"simple.fx",null, null, ShaderFlags.None,null);	
			device.Transform.Projection = Matrix.PerspectiveFovLH((float)Math.PI / 4, this.Width / this.Width, 0.250f, 100.0f);
			device.Transform.View = Matrix.LookAtLH(new Vector3(0,0,5f), new Vector3(), new Vector3(0,1,0));
			device.Transform.World = Matrix.Identity;	
			device.RenderState.ZBufferEnable = true;
			crearMeshes();
			crearMeshes2();
		}	
		public void crearMeshes()
		{
		    m = Mesh.FromFile("asteroid1.x",MeshFlags.Managed,device,out materials);
			meshMaterials = new Material[materials.Length];
			meshTextures  = new Texture[materials.Length];
			for( int i=0; i< materials.Length; i++ )
			{
				meshMaterials[i] = materials[i].Material3D;
				if ((materials[i].TextureFilename != null) && ((materials[i].TextureFilename != string.Empty)))
				{
					meshTextures[i] = TextureLoader.FromFile(device, materials[i].TextureFilename);
				}
			}
		}
		public void crearMeshes2()
		{
			m2 = Mesh.FromFile("sphere.x",MeshFlags.Managed,device,out materials2);
			meshMaterials2 = new Material[materials2.Length];
			meshTextures2  = new Texture[materials2.Length];
			for( int i=0; i< materials2.Length; i++ )
			{
				meshMaterials2[i] = materials2[i].Material3D;
				if ((materials2[i].TextureFilename != null) && ((materials2[i].TextureFilename != string.Empty)))
				{
					meshTextures2[i] = TextureLoader.FromFile(device, materials2[i].TextureFilename);
				}
			}
		}
		protected override void OnPaint(System.Windows.Forms.PaintEventArgs e)
		{
			device.Clear(ClearFlags.Target, System.Drawing.Color.White, 1.0f, 0);
			device.BeginScene();
			effect.SetValue("g_mWorldViewProjection", device.Transform.World  * Matrix.Translation(0,0f,3f) * device.Transform.View  * device.Transform.Projection );		
			effect.SetValue("g_mWorld", Matrix.Identity);
			effect.Technique = "RenderScene";		
			int numPass = effect.Begin(0);
			for (int pass=0; pass<numPass; pass++)
			{
				effect.BeginPass(pass);
				for (int i = 0; i < materials.Length; i++)
				{
					device.Material = meshMaterials[i];
					device.SetTexture(pass,meshTextures[i]);
					m.DrawSubset(i);
				}
					effect.EndPass();
			}
			effect.End();		
			//effect2.SetValue("g_mWorldViewProjection", device.Transform.World  * device.Transform.View * device.Transform.Projection );
			effect2.SetValue("g_mWorldViewProjection", device.Transform.World * Matrix.Translation(0,0f,-3f) * device.Transform.View * device.Transform.Projection );		
			effect2.SetValue("g_mWorld", device.Transform.World);
			effect2.Technique = "RenderScene";
			numPass = effect2.Begin(0);
			for (int pass=0; pass<numPass; pass++)
			{
				effect2.BeginPass(pass);
				for (int i = 0; i < materials2.Length; i++)
				{
					device.Material = meshMaterials2[i];
					device.SetTexture(pass,meshTextures2[i]);
					m2.DrawSubset(i);
				}
				effect2.EndPass();
			}
			effect2.End();		
			device.EndScene();
			device.Present();
			this.Invalidate();
		}

 

[IngisKahn]

Just a quick scan of your code -- I see that youre not clearing the ZBuffer.
device.Clear(ClearFlags.Target | ClearFlags.ZBuffer, System.Drawing.Color.White, 1.0f, 0);

 

[mutant]

You are not enabling the depth buffer in presentation parameters. Look into EnableAutoDepthStencil and AutoDepthStencilFormat properties of present params.