Change orientation of a grid view

Question

Hi, I have a grid view on an aspx page which displays its header columns horizontally, however I want them to be displayed vertically. Does anyone know how I can achieve this?

This is what Im trying to achieve from this;

Header  1	Header 2	Header 3	Header 4
Value a	Value b	Value c	Value d
Value e	Value f	Value g	Value h

to this;

Header 1	Value a	Value e
Header 2	Value b	Value f
Header 3	Value c	Value g
Header 4	Value d	Value h

Thanks for your help in advance.