Using appSettings key from web.config in NavigateUrl property

Question

I have a string in my web.config:

<configuration>

    <appSettings>

        <add key="email1" value="mailto:[email protected]" />


    </appSettings>

</configuration>

I want to use that setting in that way (see below):

<p>Write me here: <asp:HyperLink ID="HyperLink503" runat="server" 
        NavigateUrl=<%= ConfigurationManager.AppSettings["email1"] %>>my e-mail</asp:HyperLink>.</p>

However, i get an error. I tried to use a quotes in NavigateUrl, but I get same error. Please, correct my code so it can works.

Thanks in advance !

GrooV, i have two sections in my web.config with customErrors and httpErrors. Both sections redirect to 404.aspx in case of any errors. I don't know hot to get a speific error code. — Александр Д.
– Александр Д., Commented Mar 20, 2014 at 19:15

mason · Accepted Answer · 2014-03-20 14:37:29Z

4

There's a special notation for getting app settings. Also, you had an extra closing bracket.

<asp:HyperLink ID="HyperLink503" runat="server" NavigateUrl='<% $appSettings:email1 %>' Text="my e-mail" />

or

<asp:HyperLink ID="HyperLink503" runat="server" NavigateUrl='<% $appSettings:email1 %>'>my e-mail</asp:HyperLink>

answered Mar 20, 2014 at 14:37

mason

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3 Comments

Александр Д. Over a year ago

Great, it works. What if email1 = [email protected] and I want to set a NavigateUrl to mailto:email1 ? How to do concatenation ?

mason Over a year ago

In that case, do something like Yuriy's answer. Put it in the Page_Load function probably. HyperLink503.NavigateUrl = "mailto:" + ConfigurationManager.AppSettings["email1"]; I couldn't figure out how to do it inline with concatenation.

Александр Д. Over a year ago

mason, ok. I just will make email2 for that case.

Comfortably Numb · Accepted Answer · 2014-03-20 14:37:47Z

0

Apparently you cannot use <% ... %> in server-side controls. As an alternative I suggest setting the value in code behind (e.g. in page load event):

HyperLink503.NavigateUrl = ConfigurationManager.AppSettings["email1"];

answered Mar 20, 2014 at 14:37

Comfortably Numb

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2 Comments

mason Over a year ago

You can use <% ... %> in server controls, although your way works too.

Comfortably Numb Over a year ago

Yup. Nice one about $appSettings

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