Using ASP <% .... %> Tags

Question

I have been searching for this for quite a while and couldn't find a solution...

I have my aspx file and in it a asp:SqlDataSource, where I want to get values which are equal to the Request.QueryString["key"]. I have defined a parameter for it but I can't find the right syntax to set the value.

Currently it is looking like this:

<SelectParameters>
    <asp:Parameter Name="courseID" DefaultValue="<%= Request.QueryString["course_name"]
</SelectParameters>

where I always get the error, it is not well formed. What is the correct syntax, and is there an article how you use this <%.. %> commands?

Can you show an example of your code?

Babak Naffas
– Babak Naffas

2010-12-08 01:21:30 +00:00
Commented Dec 8, 2010 at 1:21 — Babak Naffas
– Babak Naffas, Commented Dec 8, 2010 at 1:21

CodexArcanum · Accepted Answer · 2010-12-08 01:24:21Z

4

There's an MSDN page that goes over what each tag is and what it does. Probably using <%...%> is not correct, as that's just a code tag. You want <%=...%> or <%:...%> which actually write values to the page.

But! Actually, if I'm reading what your problem is correctly, you want neither of those. For a SqlDataSource to pull in a query string value, you want to add a <SelectParameters> tag to the datasource, then add a <QueryStringParameter> to that.

Edit:

Yep, looking at the edit you just made, you definitely want a QueryStringParameter.

answered Dec 8, 2010 at 1:24

CodexArcanum

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Joel Coehoorn · Accepted Answer · 2010-12-08 01:25:37Z

2

You can't use <%= within high-level asp controls. That construct writes directly to the output buffer, whereas the controls need to be processed first. In other words, rather than processing your <%= before expanding the control, it must first expand the control before it can process your <%=. They are at different levels of abstraction.

To do what you want to accomplish, rather than a plain <asp:Parameter> use an <asp:QueryStringParameter>. This will allow you to set the key you want to use from the query string.

answered Dec 8, 2010 at 1:25

Joel Coehoorn

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