Accessing web config value from asp:ListItem - asp.net

Question

I'm trying to print the value I have stored in the web config as text for a list item.
<asp:ListItem Enabled="true" Selected="true" Text="Web Only - <%$ AppSettings:SubscriptionPrice %>"
Value="web" />
will give me: Web Only - <%$ AppSettings:SubscriptionPrice %>
However, if I remove the Web Only text and do this:
<asp:ListItem Enabled="true" Selected="true" Text="<%$ AppSettings:SubscriptionPrice %>"
Value="web" />
I'll get the variable desired. Is there a way to have the text and the value from my appsettings?

Answer 1

You cannot do it inline that easily. Your options are:
Set the complete value in your AppSettings. (easy)
Set the value from code behind. (easy)
Lastly, if you want to be in ASPX and nothing else is acceptable, you need to write a CodeExpressionBuilder so that you can provide custom code, as follows: (may be an overkill)
here is the code expression builder
namespace Funky
{
[System.Web.Compilation.ExpressionPrefix("Code")]
public class CodeExpressionBuilder : System.Web.Compilation.ExpressionBuilder
{
public override System.CodeDom.CodeExpression GetCodeExpression(BoundPropertyEntry entry,
object parsedData, System.Web.Compilation.ExpressionBuilderContext context)
{
return new System.CodeDom.CodeSnippetExpression(entry.Expression);
}
}
}
add this web.config entry
<compilation debug="true" targetFramework="4.5">
<expressionBuilders>
<add expressionPrefix="MyCode" type="Funky.CodeExpressionBuilder"/>
</expressionBuilders>
</compilation>
finally use the code expression as follows:
<asp:ListItem Enabled="true" Selected="true" Text='<%$ MyCode: "Web Only - " + ConfigurationManager.AppSettings["SubscriptionPrice"] %>' Value="web" />

Answer 2

I'm not sure you can do this on page, but you can do this in your code file:
ListItem item = new ListItem();
item.Text = "Web Only - " + System.Configuration.ConfigurationManager.AppSettings["SubscriptionPrice"];
item.Value = "web";
item.Selected = true;
ListBox1.Items.Add(item);

Answer 3

Sorry about the earlier post.
I think you are going to have to bind the value is code.
ddl.Items.Clear()
ddl.Items.Add(New ListItem("Web Only -" & ConfigurationManager.AppSettings("SubscriptionPrice"), "Web"))