I'm facing a problem with this error: -

Parser Error Message: '<%=opt%>' is not a valid identifier.

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and my coding is like this: -

<asp:dropdownlist id="selection" runat="server" AutoPostBack="true" OnSelectedIndexChanged="SelOption">
                                    <asp:listitem Value="HomeAddr" Text="Home Address"/>
    <asp:listitem Value="BusinessAddr" Text="Business Address"/>
    <asp:listitem Value="OtherAddr" Text="Other Address"/>

</asp:dropdownlist>

<Acme:Address id="<%=opt%>" Caption="Address" runat="server"/>

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I just want the id the change dynamically each time i select an item in my dropdownlist. Can anybody help me with these codes or is there any better code that i can refer to do same thing? Any help will be appreciated...

I don't think it quite works that way, using <%= %>. You can use the SelectedIndexChanged event for when the selected item changes, but I don't know if you want to change the ID field; what are you trying to achieve?

I just want to create a form which users can add their address of home, business or other address without showing out all 3 textbox in a same time. so, i use a dropdownlist to let the users to choose which address that they would like to input.

How about having three textboxes (two hidden and one visible), so that when the user switches values in the drop-down list, the appropriate textbox is visible.

If you are posting back each time the dropdownlist selection changes, you shouldn't need to have 3 textboxes. Just create the textbox in your code behind file and set it's ID there.

J

Thanks bmains, i succeeded to use this method. but another way, katsarosj; can i know what do we mean as code behind file? I'm just a beginner. maybe this question sounds stupid to you guys, but can you tell me what is this code behind file? is this file save as file.ascx?

The @Page directive has an attribute specified as CodeBehind, which specifies a separate file for which you can put your server-side code in it.

See if this article clears it up for you.

http://www.eggheadcafe.com/articles/20030518.asp

J