The type or namespace name "UI" does not exist in the class or namespace "system. Web" (is the Assembly reference missing ?) Solution
Source: Internet
Author: User
I am studying ASP today. net, a new class library project is created, and a control is written to test the addition of this control in the toolbox. However, after the creation, the control fails during compilation. The prompt is: [type or namespace name "UI" in class or namespace "system. "Web" does not exist (whether or not it is missing ProgramSet Reference?)], The namespace already has
Using system;
Using system. Web. UI;
Why are errors still prompted for these two items?
In the past, no web reference was added to the reference of solution resource manager, and system. Web was introduced. I think it may be that the class library I created was not a web project class library.
I tested the problem.
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