I'm trying to wrap my head around:

http://msdn.microsoft.com/en-us/library/bb196409.aspx

I'm trying to create a method in XNA that renders a single Triangle, then later make a method that takes a list of Triangles and renders them also. But it isn't working. I'm not understanding what all the things does and there's not enough information.

My methods:

// Triangle is a struct with A, B, C (didn't include) A, B, C = Vector3

public static void Render(GraphicsDevice device, List<Triangle> triangles, Texture2D texture)
{
    foreach (Triangle triangle in triangles)
    {
        Render(device, triangle, texture);
    }
}

public static void Render(GraphicsDevice device, Triangle triangle, Texture2D texture)
{
    BasicEffect _effect = new BasicEffect(device);
    _effect.Texture = texture;
    _effect.VertexColorEnabled = true;

    VertexPositionColor[] _vertices = new VertexPositionColor[3];

    _vertices[0].Position = triangle.A;
    _vertices[1].Position = triangle.B;
    _vertices[2].Position = triangle.B;

    foreach (var pass in _effect.CurrentTechnique.Passes)
    {
        pass.Apply();

        device.DrawUserIndexedPrimitives<VertexPositionColor>
        (
            PrimitiveType.TriangleList,
            _vertices,
            0,
            _vertices.Length,
            new int[] { 0, 1, 2 }, // example has something similiar, no idea what this is
            0,
            3 // 3 = gives me an error, 1 = works but no results
        );
    }

}