i try this example but not working.

<%string id = Request.QueryString["id"]; %>// get value and set in one variable
<%=id%>// display successfully variable's value
<asp:SqlDataSource ID="SqlDataSource1" runat="server" ConnectionString="<%$ ConnectionStrings:ConnectionString %>" 
SelectCommand="SELECT [id], [name], [image], [old_price], [new_price] FROM [product] where [id]= "'<%=id%>'"" ></asp:SqlDataSource>

a problem in SelectCommand how to set variable in query i try like <%=id%>

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