VertexBuffer constructor: why both Type and VertexFormat?

I'm using the following constructor to create VertexBuffer's:

public VertexBuffer(Type, int, Device, Usage, VertexFormats, Pool) ;

I had a problem with my application, until I realized I was passing a Type
based on a PositionColored vertex and a VertexFormat set to PositionTextured
(FWIW, the goal was PositionTextured).

Why are both parameters required? It seems like if I passed a Type based on
a vertex that was different VertexFormat than what is passed it just
wouldn't work. I'm very much a beginner in regards to DirectX, so it's
possible mixing and matching can be done. I just don't know the rules yet
(except for the above based on the my example, where I learned you don't mix
PositionColored with PositionTextured)...

Thanks for responses! : )

For context: VS C++.NET 2005 PRO (and Express, using both!!! : ) using
clr:/pure syntax...

[==P==]




.

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