Page refreshes when i click a record in grid(using asp.net)

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VB

Hi,

I'm trying to revise a program done in vs 2003 using asp.net...
On the page, Records is diplayed in the grid, the user will then
select from the grid. But when i click on a record in the grid,
the page refreshes and the grid becomes empty?

Inside the grid, I call a procedure from which the value needed in the
query is the value i selected from the grid.

How can i prevent the page from refreshing when i click on a record in
the grid, so that the grid wont be empty?
or
What i need to do so that the records in the grid stays when i click o a record?

please help me.