How do I display a Graph when clicking on a Name in a GridView in asp .net

<asp:gridview autogeneratecolumns="false" runat="server" id="grdCustomPagging" onrowcommand="grdCustomPagging_RowCommand" >
   <columns>
     <asp:linkbutton runat="server" id="lnkView" commandargument='<%#Eval("DealId") %>'>
         CommandName="VIEW">View Deal</asp:linkbutton>
 </columns>
</asp:gridview>

protected void grdCustomPagging_RowCommand(object sender, GridViewCommandEventArgs e)
{
    if (e.CommandName == "VIEW")
    {
        LinkButton lnkView = (LinkButton)e.CommandSource;
        string dealId = lnkView.CommandArgument;
        // do something with CommandArgument value like loading graph 
    }
}