When dynamically adding columns to a GridView control, where do you place the code?

[keithb]

Where does this code belong? Page Load event? Prerender event?

With GridView1.Columns
.Add(New BoundField)
.Add(New CheckBoxField)
.Add(New HyperLinkField)
.Add(New ImageField)
.Add(New ButtonField)
.Add(New CommandField)
.Add(New TemplateField)
End With

Thanks,

Keith