How can i use 2 usercontrols containing Gridview in a webpart

[rote]

My goal is to have 2 webparts connected which will have Gridviews in it.
I have tried the following sample at:

http://www.carlosag.net/Articles/WebParts/moreRealSample.aspx

But i can't get it to work as its an old article and the Ifield interface i
guess is obsolete.
But when i tried changing it to IWebPartField Interface i keep getting
error:

'IWebPartField. GetFieldValue' in explicit interface declaration is not a
member of interface

When using the approach on that page do i need to use the IWebPartRow
interface?


So my question is how can i use usercontrols in webparts to achieve this.If
possible how?