How Can I Write c# code inside ASP tags

Question

I have this code and I have this error Code blocks are not supported in this context

  <%
        for (int i = 0; i < 5; i++)
        {
    %>
    <asp:DropDownList runat="server" ID="<%=i %>">
        <asp:ListItem><%i.ToString(); %></asp:ListItem>
    </asp:DropDownList>
    <%
        }            
    %>

Answer 1

That's not allowed in web forms.