[Solved] the type or namespace name ‘ui’ does not exist in the namespace ‘system.web’

Error:
the type or namespace name ‘ui’ does not exist in the namespace ‘system.web’

Solution:

Right click on the project -> Add -> Reference.. -> Assemblies (left top) -> Framework -> System.web

Select and ok.

Note:
We are using Microsoft Visual Studio Express 2013 for Windows Desktop.

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