How to develop transaction form

Hello friends
i have developed a transaction form (purchase order) in asp.net
My flow is as follows:
When user click on Purchase order in menubar
a page (Search.aspx) is loaded with gridview control having following columns (PO.No., Party Name, Amount, Edit Button)
now when i click on edit button for particular records i pass that selected gridview row in session in gridview's selection changed events


Protected Sub gvResultSet_SelectedIndexChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles gvResultSet.SelectedIndexChanged Session("SelectedRow") = gvResultSet.SelectedRow Response.Redirect("PO.aspx") End Sub
now on PO.aspx's page_load event i hv written following code

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