failed to load viewstate

[Ariel Gimenez]

Hello,
Can someone helpme?
I have a datagrid in wich im using column templates for the edit command,
with comboboxes.
The datagrid works fine for the first time i execute the edit command but
the second time it gives me the following error...

Failed to load viewstate. The control tree into which viewstate is being
loaded must match the control tree that was used to save viewstate during
the previous request. For example, when adding controls dynamically, the
controls added during a post-back must match the type and position of the
controls added during the initial request.

any help will be appreciated
Thanks in adfance
Ariel Gimenez

 

[Felbrigg]

The message is hinting that dynamic controls in the grid must be reloaded
during postback.

It is comman practice ( and i assume your doing it ) to put your databinding
inside "if(IsPostBack==false)" which is fine for the data. But if you have
dynamicly added controls, these have to be recreated for every postback.

 

[Mohamoss]

Hi Ariel
This problem probably happens because you are deleting controls form
those you build your web form with. Any control that you had with the data
grid and you delete, make it invisible instead ……..Hope this would help.

 

[Ariel Gimenez]

Thanks Felbrigg!
I dont understand what you mean with dynamic controls in the grid must be
reloaded
during postback...
Im not adding controls manually, i just using column templates, in these
columns i have changed for the edit command the textbox with a dropdowlist,
and in the item databound event im retrieving these selected values with
findcontrol and calling stored procedures in order to update the db...
First time all works fine, but in some cases (im doing a kind of validation
in the update command) i need to refire this update command and in this case
is when im getting the stinking message

thanks again
if u think you need more details im here to give it... just ask me

 

[Ariel Gimenez]

Thanks for your reply Mohamoss!!!
Unfortunately in my case im not deletting any control programatically, in my
previous response to Felbrigg i explained what im doing detailed.
By the way... (you are talking about hidding controls) im using one field
"id" and i dont want the user seeing it, but if i put this column
visible=false i cant retrieve the value for further use of it in the update
operation... any ideas?

Ariel Gimenez
Argentina