Linking 2 grids with primary keys

[Katlego]

Hi, im building a forum like website with 3 tables, (Topics, Threads & Messages). iv got 3 forms with the same names. I would like to pass the primary key of one table (Topic) on the 1st form to link up with the relevant Threads on the Threads form. Here is my code below on the topics form.

 <Columns>
        <telerik:GridHyperLinkColumn DataTextField="Name"
            DataNavigateUrlFields="TopicID" 
            DataNavigateUrlFormatString= "Threads.aspx?TopicID={0}" ItemStyle-Font-Bold="true" />
        <telerik:GridHyperLinkColumn DataNavigateUrlFields="TopicID" 
        DataNavigateUrlFormatString="Threads.aspx?TopicID={0}" HeaderText="Topic" />
  </Columns>

The primary key does get passed as i can see it in the address bar but how do i retrieve it on the threads form?

Thanks in advance

[Katlego]

Just figured it out...