How do I get the indexbuffer indices in c#

See more:

C#

DirectX

indexes

I got some problem when I wanted to do some work in collision detection. I want to get all the triangle vertexs,but I can not get the right indexbuffer indices. The right array should be: 0 2 1 2 3 1 ...,but what I get is : 131072 131073 65539 ...
Here is the code that relates to my question

meshMaterials = new Material();
            meshMaterials.Ambient = System.Drawing.Color.White;            
            meshMaterials.Diffuse = System.Drawing.Color.White;            
            ExtendedMaterial[] materials = null;
            mesh = Mesh.FromFile(@"C:\Users\Administrator\Documents\Visual Studio 2010\Projects\iR1000\iR1000\fang.x", MeshFlags.SystemMemory, device, out materials);
            if (meshTextures == null)                                      
            {
                meshTextures = new Texture[materials.Length];               
                meshMaterialsl = new Microsoft.DirectX.Direct3D.Material[materials.Length];   }     
           
            for (int i = 0; i < materials.Length; i++)                       
            {
                meshMaterialsl[i] = materials[i].Material3D;
                meshMaterialsl[i].Ambient = meshMaterialsl[i].Diffuse; 
                meshTextures[i] = TextureLoader.FromFile(device, @"C:\Users\Administrator\Documents\Visual Studio 2010\Projects\iR1000\iR1000\1533.jpg"+ materials[i].TextureFilename);

            }
            Mesh mesh1 = mesh.Clone(mesh.Options.Value, VertexFormats.Position | VertexFormats.Normal | VertexFormats.Texture0 | VertexFormats.Texture1, mesh.Device);
using (IndexBuffer ib = mesh1.IndexBuffer)
{
      int[] indices2 = (int[])ib.Lock(0, typeof(int), LockFlags.None , mesh1.NumberFaces * 3);
      for (int i = 0; i < indices2.Length; i++)
          {
             button1.Text += Convert.ToString(indices2[i]) + " ";
           }
    ib.Unlock();
}

Can someone please tell me What am I doing wrong ?
and more importantly for me, how can I make the above work?
Any help would be much appreciated.