datagrid 超连接怎麽带多个参数

Question

string strSQL = "select po_id,supplier_id from po"; 
OleDbCommand Comm = new OleDbCommand(strSQL, Conn); 
OleDbDataAdapter da = new OleDbDataAdapter(); 
da.SelectCommand = Comm; 
Conn.Open(); 
DataSet ds = new DataSet(); 
da.Fill(ds, "book"); 
dg.DataSource = ds.Tables["book"].DefaultView; 
dg.DataBind(); 
//数据绑定 
<ASP:DataGrid id="dg" runat="server" AllowPaging="True" Height="1px" Width="352px" ShowHeader="False"> 
<Columns> 
<asp:ButtonColumn CommandName="Select" Text="选取"></asp:ButtonColumn> 
<asp:HyperLinkColumn DataNavigateUrlField="supplier_id" Target="_blank" DataNavigateUrlFormatString="show.aspx?str={0}" DataTextField="po_id" DataTextFormatString="打开" > 
</asp:HyperLinkColumn> 
</Columns> 
</ASP:DataGrid> 
//DataGrid代码 
DataNavigateUrlFormatString="show.aspx?str={0}" 这里只能带一个参数supplier_id 请问我怎么带两个参数 supplier_id 和material_po