IntelliSense is not working in C++

[C++] There is an issue with the .ncb file

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If the no compile browser (.ncb) file located at the root of your project directory is read-only or becomes corrupt in some manner, IntelliSense information will no longer be available. To fix this, do the following:

1. Close the solution.
2. Delete the .ncb file.
3. Reopen the solution.