How do you enable checkbox from code behind that is already in a disabled state?

I have an asp checkbox on a form that is disabled during page load using CheckBox1.InputAttributes.Add("disabled", "disabled"). On the form is a text box which is filled via a server side event. In that event the checkbox should then be enabled. I have tried using checkbox1.enabled=true or CheckBox1.InputAttributes.Add("disabled", "") but the checkbox remains disabled.
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David RobitailleConnect With a Mentor Analyst ProgrammerCommented:
i just think about it, do you use a
<input id="Checkbox1" type="checkbox" />
or a
<asp:CheckBox ID="CheckBox1" runat="server" />
for code beind to work, you need the second
Also :
make sure you put that if in the page load, becaus the page is loaded at each post back...

If Not Page.IsPostBack Then 
end if 

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David RobitailleAnalyst ProgrammerCommented:
disable the check box during page load using checkbox1.enabled=false instead
mrl72Author Commented:
That doesn't work, the checkbox remains disabled.
David RobitailleAnalyst ProgrammerCommented:
is the checkbox is into some update panel or something?
submit the aspx code please
David RobitailleAnalyst ProgrammerCommented:
So did that works?
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