Validate a ListBox using validators inside a usercontrol

[Fernando Lopes]

Hi.
I have a page with a usercontrol.
In this UC, I have two ListBoxes and two buttons. When i click in one
button, i get the selected item in the listbox.
How can i validate, using validators, if the selected listbox has a selected
item?

Thanks.

Fernando

 

[Peter Blum]

RequiredFieldValidator does it. If you "unselected" state is actually the
first item shown, set its InitialValue property to the value you assigned to
that "unselected" item.

--- Peter Blum
www.PeterBlum.com
Email: (e-mail address removed)
Creator of "Professional Validation And More" at
http://www.peterblum.com/vam/home.aspx

 

[Fernando Lopes]

Thanks Peter.
But how can i do that? I say this because my "unselected" value is a blank
ListItem.

Thanks again.
Fernando

 

[Fernando Lopes]

In true, my listbox doesn't have a "unselected" item.

 

[Peter Blum]

When there is no selection, the validator will retrieve to a value of ""
from the listbox. Your InitialValue property is already "". So just use the
RequiredFieldValidator without changing InitialValue.

--- Peter Blum
www.PeterBlum.com
Email: (e-mail address removed)
Creator of "Professional Validation And More" at
http://www.peterblum.com/vam/home.aspx