Passing Params From Aspx - asp.net

Question

So I had have a table populating with data but I was wondering how I could pass two bits of data from a row depending on which link at the end of the row is clicked.
<%WebReceiptSummary[] receipts = GetReceipts();
if (receipts != null)
{
for (int i = 0; i < receipts.Length; i++)
{%>
<tr>
<td><%= receipts[i].Type%></td>
<td><%= receipts[i].PolicyNo%></td>
<td><%= receipts[i].Date%></td>
<td class="c"><%= receipts[i].Amount%></td>
<td class="r"><asp:LinkButton OnCommand="PDFLinkClick"
CommandArgument="<%= receipts[i].PDF %>&<% receipts[i].PolicyNo %>" runat="server">View PDF</asp:LinkButton></td>
</tr>
<% }
}
%>
Obviously my CommandArgument just passes back the string <%= receipts[i].PDF %>&<% receipts[i].PolicyNo %> not the values. What would be the best way of doing this? I was also thinking of using;
<asp:HiddenField ID="hiddenIsCaptchaReadyValidate" runat="server" Value=false/>
But I have the same problem here where the value is placed within quotes and also it means I need to create two hiddenfields for ever row which isn't the most efficient way of doing this. Thoughts?

Answer 1

It is not possible to have <%= %> commands as part of an attribute when added via the mark-up.
Can I recommend that instead of using the for loop in the ASPX, you instead use the <asp:Repeater> control? This will also allow you to set the CommandAttribute value from the code-behind.
An example...
<asp:Repeater runat="server" id="receipts" OnItemDataBound="receipts_ItemDataBound">
<ItemTemplate>
<tr>
<td><%#((WebReceiptSummary)Container.DataItem).Type%></td>
<td><%#((WebReceiptSummary)Container.DataItem).PolicyNo%></td>
<td><%#((WebReceiptSummary)Container.DataItem).Date%></td>
<td class="c"><%#((WebReceiptSummary)Container.DataItem).Amount%></td>
<td class="r"><asp:LinkButton ID="pdfLink" OnCommand="PDFLinkClick" runat="server">View PDF</asp:LinkButton></td>
</tr>
</ItemTemplate>
</asp:Repeater>
In your Init or Load in code behind...
receipts.DataSource = GetReceipts();
receipts.DataBind();
Then...
protected void receipts_ItemDataBound(Object sender, RepeaterItemEventArgs e)
{
((LinkButton)e.Item.FindControl("pdfLink")).CommandArgument =
((WebReceiptSummary)e.DataItem).PDF + ((WebReceiptSummary)e.DataItem).PolicyNo;
}
UPDATE
Thinking about it, rather than using the code-behind setting of the CommandArgument, I think (I haven't tested this yet) you could actually do the following without needing the receipts_ItemDataBound function...
<td class="r"><asp:LinkButton ID="pdfLink" OnCommand="PDFLinkClick" runat="server"
CommandArgument="<%#((WebReceiptSummary)Container.DataItem).PDF + ((WebReceiptSummary)Container.DataItem).PolicyNo%>"
>View PDF</asp:LinkButton></td>
UPDATE 2
All instances of Container.DataItem in the above examples, have been changed into the tight-bound ((WebReceiptSummary)Container.DataItem)