Radio Button question

[JimS]

I am using DotNet 2.0 and Visual Studio 2005. The project is a web project.
I am currently using an ObjectDataSource to populate a datagrid.
The ObjectDataSource is configured to a function in a class to populate the
initial load of data.

I would like to use a Radio Button list to change the data viewed in the
Grid. What is the best practice to perform this task.
Is it better to have a default value for the Radio Buttons and have the data
grid use the Radio Buttons to populate initially and on any repost?
Is it better to have an event handler for the Radio Buttons choose the
correct parameters to pass to the function and then try to update the grid
during the post back? How could one do this?

Thanks for any insight