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thanks, and is there any client side drag&drop validation?

I'm using drag/drop(insert mode) in two multiselect, I want to have a server-side validation when user drag and drop item from one multiselect to another.
For example, the first multiselect named...

Hi,
I have solved this problem, thanks!

I have a TreePanel and a Button, I want to get data from SQL Server to create TreeNode with checkbox dynamically.
If I click the button, then get all the TreeNode which has been checked and output...

Extension Method?
Oh, I see, thanks very much!

Hi!

I have read the code above, but it seems that there is no such a function named Update in Label:
http://msdn.microsoft.com/en-us/library/system.web.ui.webcontrols.label_members(v=VS.80).aspx

Thanks your reply, But can you tell me how to call .Render() on the <asp:Label>?

For example, I have a <ext:Button> and a <asp:Label>
If I click the button, I want to change the value of label
Is there any way to change the value of asp.net control? Thanks!