Bind button visibility to the expresion (C#)
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Published on 2010-05-19T22:53:24Z
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I have a delete button in each row of GridView
(component ASP.NET). I want some of the delete buttons to be invisible. The visibility of the delete button should depend on the data that are back the row.
GridView
is backed by EntityDataSource
. GridView
displays entities called Category
, one instance in each row. Entity Category
has (besides others) also a field of type EntityCollection
. Name of that field is Items
. Basically I want to allow user to delete a row only if the Items
field of backing Category
entity is an empty collection.
I cannot make up the binding of Visible
property. I have no experience with bindings and Google does not really help.
This is how the button looks right now:
<asp:Button ID="DeleteButton" runat="server" CommandName="Delete"
Text="Delete"
Visible=??? ></asp:Button>
I don't know what should replace ???
. The button schold be visible only when this expression evaluates to true:
((SimpleEShop.Model.Category) dataItem).Items.LongCount() <= 0
where dataItem
variable contains data of current row in the table.
What is the binding that I need ?
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