<%# IsEditable %> and <%= IsEditable %>

[Max2006]

Hi,

When I use this tag:

<asp:lable . Visible='<%# IsEditable %>'

I have to do DataBind so the binding takes place.

I am trying to use the following notation to do the similar thing without
forced to call DataBind method:

<asp:lable . Visible='<%= IsEditable %>'

But I receive this error:

Generation of designer file failed: Cannot create an object of type
'System.Boolean ' from its string representation '<%= IsEditable %>' for the
'Visible' property.

Is there any way to use <%= IsEditable %instead of <%# IsEditable % to
avoid calling the DataBind?

Thank you,

Max

[Teemu Keiski]

<%=expression % is executed at render-time, and is meant to output literal
stuff, not to set property values. You certainly could set it in code, but
it removes completely the point of using separate variable.

--
Teemu Keiski
AspInsider, ASP.NET MVP
http://blogs.aspadvice.com/joteke
http://teemukeiski.net

"Max2006" <al*******@news group.nospamwro te in message
news:%2******** ********@TK2MSF TNGP05.phx.gbl. ..

Hi,

When I use this tag:

<asp:lable . Visible='<%# IsEditable %>'

I have to do DataBind so the binding takes place.

I am trying to use the following notation to do the similar thing without
forced to call DataBind method:

<asp:lable . Visible='<%= IsEditable %>'

But I receive this error:

Generation of designer file failed: Cannot create an object of type
'System.Boolean ' from its string representation '<%= IsEditable %>' for
the 'Visible' property.

Is there any way to use <%= IsEditable %instead of <%# IsEditable % to
avoid calling the DataBind?

Thank you,

Max

[Max2006]

Thank you for help.

Do you know any resource that allows me monitor - or spy into - when / how
these bindings happen?

If you know any online resource that explains the depth of the binding in
ASP.NET, that would be really helpful. I like to know binding beyond the
syntaxes.

Thank you,
Max


"Teemu Keiski" <jo****@aspalli ance.comwrote in message
news:uU******** *****@TK2MSFTNG P02.phx.gbl...

<%=expression % is executed at render-time, and is meant to output
literal stuff, not to set property values. You certainly could set it in
code, but it removes completely the point of using separate variable.

--
Teemu Keiski
AspInsider, ASP.NET MVP
http://blogs.aspadvice.com/joteke
http://teemukeiski.net

"Max2006" <al*******@news group.nospamwro te in message
news:%2******** ********@TK2MSF TNGP05.phx.gbl. ..

>Hi,

When I use this tag:

<asp:lable . Visible='<%# IsEditable %>'

I have to do DataBind so the binding takes place.

I am trying to use the following notation to do the similar thing without
forced to call DataBind method:

<asp:lable . Visible='<%= IsEditable %>'

But I receive this error:

Generation of designer file failed: Cannot create an object of type
'System.Boolea n' from its string representation '<%= IsEditable %>' for
the 'Visible' property.

Is there any way to use <%= IsEditable %instead of <%# IsEditable %>
to avoid calling the DataBind?

Thank you,

Max

[Teemu Keiski]

Now that we are discussing about expressions, something like that could in
fact help you: http://msdn2.microsoft.com/en-us/library/d5bd1tad.aspx

--
Teemu Keiski
AspInsider, ASP.NET MVP
http://blogs.aspadvice.com/joteke
http://teemukeiski.net

"Max2006" <al*******@news group.nospamwro te in message
news:OK******** ******@TK2MSFTN GP04.phx.gbl...

>
Thank you for help.

Do you know any resource that allows me monitor - or spy into - when / how
these bindings happen?

If you know any online resource that explains the depth of the binding in
ASP.NET, that would be really helpful. I like to know binding beyond the
syntaxes.

Thank you,
Max


"Teemu Keiski" <jo****@aspalli ance.comwrote in message
news:uU******** *****@TK2MSFTNG P02.phx.gbl...

><%=expressio n% is executed at render-time, and is meant to output
literal stuff, not to set property values. You certainly could set it in
code, but it removes completely the point of using separate variable.

--
Teemu Keiski
AspInsider, ASP.NET MVP
http://blogs.aspadvice.com/joteke
http://teemukeiski.net

"Max2006" <al*******@news group.nospamwro te in message
news:%2******* *********@TK2MS FTNGP05.phx.gbl ...

>>Hi,

When I use this tag:

<asp:lable . Visible='<%# IsEditable %>'

I have to do DataBind so the binding takes place.

I am trying to use the following notation to do the similar thing
without forced to call DataBind method:

<asp:lable . Visible='<%= IsEditable %>'

But I receive this error:

Generation of designer file failed: Cannot create an object of type
'System.Boole an' from its string representation '<%= IsEditable %>' for
the 'Visible' property.

Is there any way to use <%= IsEditable %instead of <%# IsEditable %>
to avoid calling the DataBind?

Thank you,

Max

[bruce barker]

no.

<%= expression %is translated to:

Controls.Add(ne w Label(expressio n));

where <asp:label id=lb1 Visible=<%=expr ession%/is translated to:

lb1 = new Label();
lb1.Visible = "<%=expression% >";

and when databind is called, it checks for properties with binding
expressions, evals the expression, and sets the property to the value.

-- bruce (sqlwork.com)

Max2006 wrote:

Hi,

When I use this tag:

<asp:lable . Visible='<%# IsEditable %>'

I have to do DataBind so the binding takes place.

I am trying to use the following notation to do the similar thing without
forced to call DataBind method:

<asp:lable . Visible='<%= IsEditable %>'

But I receive this error:

Generation of designer file failed: Cannot create an object of type
'System.Boolean ' from its string representation '<%= IsEditable %>' for the
'Visible' property.

Is there any way to use <%= IsEditable %instead of <%# IsEditable % to
avoid calling the DataBind?

Thank you,

Max

[Walter Wang [MSFT]]

Hi Max,

A tip on inspecting the generated class from a WebForm is to first
precompile the website and use Reflector
(http://www.aisto.com/roeder/dotnet/) to view the source code of the
WebForm:

aspnet_compiler -v / -p c:\projects\web site1 c:\temp\website 1
reflector c:\temp\website 1\bin\*.dll
Regards,
Walter Wang (wa****@online. microsoft.com, remove 'online.')
Microsoft Online Community Support

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[Max2006]

Thanks Bruce for reply.

At this point, the outcome of <asp:label id=lb1 Visible=<%=expr ession%/>
is the error I mentioned. It doesn't work!

"bruce barker" <no****@nospam. comwrote in message
news:%2******** ********@TK2MSF TNGP04.phx.gbl. ..

no.

<%= expression %is translated to:

Controls.Add(ne w Label(expressio n));

where <asp:label id=lb1 Visible=<%=expr ession%/is translated to:

lb1 = new Label();
lb1.Visible = "<%=expression% >";

and when databind is called, it checks for properties with binding
expressions, evals the expression, and sets the property to the value.

-- bruce (sqlwork.com)

Max2006 wrote:

>Hi,

When I use this tag:

<asp:lable . Visible='<%# IsEditable %>'

I have to do DataBind so the binding takes place.

I am trying to use the following notation to do the similar thing without
forced to call DataBind method:

<asp:lable . Visible='<%= IsEditable %>'

But I receive this error:

Generation of designer file failed: Cannot create an object of type
'System.Boolea n' from its string representation '<%= IsEditable %>' for
the 'Visible' property.

Is there any way to use <%= IsEditable %instead of <%# IsEditable %>
to avoid calling the DataBind?

Thank you,

Max

[Walter Wang [MSFT]]

Hi Max,

lbl1.Visible = "<%= expression %>";

is not a data binding expression, that's why it doesn't work.
Regards,
Walter Wang (wa****@online. microsoft.com, remove 'online.')
Microsoft Online Community Support

=============== =============== =============== =====
When responding to posts, please "Reply to Group" via your newsreader so
that others may learn and benefit from your issue.
=============== =============== =============== =====

This posting is provided "AS IS" with no warranties, and confers no rights.