validation(asp.net):attribution onblur is not a valid attribute of

[Guest]

I use asp.net 2.0.
I try to use onblur in textbox of asp.net.


however,
it said that
validation(asp.net):attribution onblur is not a valid attribute of element
'textbox'

what casuse this problem?
I can not use OnBlur in textbox of asp.net???

this is the code
<asp:TextBox ID="uxOverride" Runat="server" Onblur="Overridetest();"
Columns="5" CssClass="ms-generaltext"
Text='<%#session("DefaultOverride")%>'></asp:TextBox></td></tr></table>

 

[Mark Newmister]

Add via code-behind as such:

uxOverride.Attributes.Add("onblur", "Overridetest();");