ASP.NET Custom Binding

Question

I am trying to bind Panel.visible to be visible depending on matching database table field and querystring as:

<asp:Panel ID="Panel2" runat="server" Visible='<%# Eval("Mjr_Id") == Request.QueryString["Mjr_Id"] %>'> ... </asp:Panel>

But it failed, do you have idea about the correct binding format to do this?

post your code ,not getting your problem

LearningAsp
– LearningAsp

2012-10-23 15:33:09 +00:00
Commented Oct 23, 2012 at 15:33 — LearningAsp
– LearningAsp, Commented Oct 23, 2012 at 15:33
It failed: what is the error?

codingbiz
– codingbiz

2012-10-23 15:44:44 +00:00
Commented Oct 23, 2012 at 15:44 — codingbiz
– codingbiz, Commented Oct 23, 2012 at 15:44

Richard Deeming · Accepted Answer · 2012-10-23 15:43:46Z

1

The Eval function returns an object, whereas the QueryString indexer returns a string. Applying the equality operator to an object and a string will result in a reference comparison, whereas you want a value comparison.

To make the code work, you'll need to convert the object to a string:

Visible='<%# Eval("Mjr_Id", "{0}") == Request.QueryString["Mjr_Id"] %>'

NB: This will perform a case-sensitive ordinal comparison. If that's not what you want, you'll need to use the string.Equals(string, string, StringComparison) method.

answered Oct 23, 2012 at 15:43

Richard Deeming

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