HTML element id changes at runtime

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Ok i have an ASP.NET web form, i've always wondered why at runtime the ID's change of my html elements if they're placed inside of a asp:control

e.g

ASP.NET

<asp:Content ID="Content2" ContentPlaceHolderID="ContentBody"  runat="server">
<img id="produt_image">

at runtime becomes

HTML

<img id="ContentBody_product_image">

why does it do this, and does it affect naming / calling that img box from the code behind, would i ref it using product_image or the newly runtime id?

Posted 21-Nov-14 1:44am

Grant Weatherston

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Peter Leow · Answer 1 · 2014-11-21T01:57:00

Solution 1

Refer: Control ID Naming in Content Pages[^]
More reading: All about Client ID Mode in ASP.NET 4[^]

Posted 21-Nov-14 1:57am

Peter Leow

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