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How can I fill in ASP:TextBox.Text property dynamically as I generate table?

Last Modified: 2013-11-26

I'm super new to ASP, and struggling with basic concepts. In the attached code snippet, you can see that I'm able to lay down table rows containing <INPUT> tags, dynamically filling in the Text property via the embedded code block. For instance, "<%= s.Name %>" evaluates to the Name property of the business object (for that row).

I wanted to use the AJAX CalendarExtender control, but it appears to support binding only to an ASP:TextBox control, as opposed to the generic <INPUT>. Ok, so I swapped out the <INPUT> for the <ASP:TextBox>. The problem is that it immediately balked at my previously-ok use of the embedded code block. I've been unable to discover an equivellent means of inserting the date value from the BO into the ASP:TextBox.

To be clear, please keep in mind that I'm laying down potentially hundreds of rows, each to receive it's corresponding date values.

A related topic: I noticed that only the first row gets the date picker. I assume I need to generate a unique (incrementing) ID for each ASP:TextBox, so that each new CalendarExtender will bind to its corresponding TextBox.

But, when I tried something like:

<% int nextId = 1; foreach (Site s in ViewData.Model.Sites)
                   { %>
<asp:TextBox ID="Date<%=nextId%>"

I get:

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

Obviously, I'm missing something pretty basic here. I don't understand why it's ok to evaluate code blocks in the <INPUT> construct, but not the <ASP:TextBox>.
    <% foreach (Site s in ViewData.Model.Sites) 
       { %>
                <% if (s.IsSelected) { %><td><input type="checkbox" name="selectedSites" checked="checked" value="<%= s.Id %>" /></td><% }
                     <%--<input id="Date2" class="shortdate" type="text" value="<%= s.EffectiveStartDate.ToShortDateString() %>" /> --%>
                    <asp:TextBox ID="Date2" runat="server" Text='<%= s.EffectiveStartDate.ToShortDateString() %>' >
                    <cc1:CalendarExtender ID="CalendarExtender1" runat="server" TargetControlID="Date2" CssClass="">
                <td><input type="text" value="<%= s.EffectiveEndDate.ToShortDateString() %>" /> </td>
                <td><%= s.Name %>  </td>
    <% } %>

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