ASP.NET, .NET 2.0, textbox "lost focus" help needed...

Hi all,
I'm having trouble finding an answer and hope you can help.

I have an ASP.NET form (using VS 2005 and .NET 2.0) that has 3 textboxes on it.  I want to be able to add the value of textbox1 to the value of textbox2 and add it to textbox3 on the client side without a trip to the server.

Can you provide a snippet of code that shows how to do something like this?

Thanks,
Terry
colepcAsked:
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badalpatelConnect With a Mentor Commented:
u have to write this script

<script language="javascript" type="text/javascript">
function summation()
{
    document.getElementById("textbox3").value = (document.getElementById("textbox1").value)/1 + (document.getElementById("textbox2").value)/1
}
</script>

and on aspx.vb u have to just call this script function like

textbox1.Attributes.Add("onchange", "javascript:summation()")
        textbox2.Attributes.Add("onchange", "javascript:summation()")
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colepcAuthor Commented:
Thanks!  That worked great.  Can you point me to a web reference for where I can learn more about what "attributes" are possible.  For example, you show an "onchange" event attribute.  I'd like to explore more of those.

Thanks again for your solution.

Terry
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