VertexBuffer mVertices = new VertexBuffer(device, Count * 16, Usage.None, 0, Pool.Managed);
DataStream vertices = mVertices.Lock(0, 0, LockFlags.Discard);
vertices.WriteRange(Vertex_GRIG, 0, Count);
mVertices.Unlock();

[StructLayout(LayoutKind.Sequential)]
public struct Vertex
{
     public Vector3 Position;
     public int Color;
     public static int SizeBytes
     {
        get { return Marshal.SizeOf(typeof(Vertex)); }
     }
     public static VertexFormat Format
     {
         get { return VertexFormat.Position | VertexFormat.Diffuse; }
     }
}