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After a few updates, my helpers started giving problems, for example, if I were to use the @Html.TexBoxFor, Razor would never recognize.
After doing a lot of research, I was asked to use the @using System.Web.Mvc.Web in the View I was writing. Here came the surprise: Mine System.Web.Mvc does not possess the Web.
For some time it worked normally, I don’t know what could have happened and I’m starting in MVC now.

You can include both of them in your question
web.config, the root and the inside of the directoryViews?– Leonel Sanches da Silva
What updates ??? and which version is using ?
– user6026