Dynamically generated Table Rows Dissappear

[Bijoy Naick]

I have something strange going on.. My .aspx page contains a file upload
control, a "Import Data" button, a "newTransactions" <asp:table>,
a"SaveTrans" button and an confMsg label.

First the user selects a file, then clicks Import Data. The page now reads
the PostedFile and displays each line as a new row in the newTransactions
table. All of this works fine.

For now, I've programmed SaveTrans_Click to display the number of rows in
the newTransactions table in the confMsg label.

When I click on the SaveTrans button, all the rows added dynamically in the
table dissapper and as a result, the congMsg label displays 1 (the header
row I hard coded in the <asp:table> declaration).

What do i need to do to avoid this? Why is this happening?

Thanks.

Bijoy

 

[Jeffrey Palermo [MCP]]

Bijoy,
Understand that dynamic controls have to be created and added to the
page each time the page is built. You are building these table rows in a
post-back event handler, but on the next post-back you aren't building the
rows, so naturally they won't be there after that last post-back. You need
to rethink your page design to make sure that the data for these table rows
can be saved in viewstate and persisted from post-back to post-back.

Best regards,
Jeffrey Palermo

 

[Bijoy Naick]

I "fixed" this by adding the rows to a Session level variable. I was unable
to add a tablerow to ViewState.. Got an error about it not implementing
"Serializable"..

How can I add a tablerow to viewstate?

Thx.

Bijoy

 

[Jeffrey Palermo [MCP]]

Bijoy,
You cannot add objects to viewstate that are not serializable. The
objects that are stored in viewstate can be represented as a string.
TableRow is not one of these. You can store the data for the row in
viewstate, but not the control itself.

--
Best regards,
Jeffrey Palermo
Blog: http://dotnetjunkies.com/weblog/jpalermo

I "fixed" this by adding the rows to a Session level variable. I was unable
to add a tablerow to ViewState.. Got an error about it not implementing
"Serializable"..

How can I add a tablerow to viewstate?

Thx.

Bijoy


"Jeffrey Palermo [MCP]" <http://dotnetjunkies.com/weblog/jpalermo> wrote in
message news:[email protected]...

Bijoy,
Understand that dynamic controls have to be created and added to the
page each time the page is built. You are building these table rows in a
post-back event handler, but on the next post-back you aren't building the
rows, so naturally they won't be there after that last post-back. You need
to rethink your page design to make sure that the data for these table rows
can be saved in viewstate and persisted from post-back to post-back.

Best regards,
Jeffrey Palermo

in
the