c# - Can't import system.web.ui.design -


i'm trying import following namespace:

using system.web.ui.design;

but can't find it. added reference/assembly-reference following:

system.web; system.design;

but still can't find it! need import can use containercontroldesigner. i'm using .net framework 4 , normal asp.net web forms web application.

make sure have referenced system.design.dll assembly project.


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