[VS] ASPX: Guests incorrectly see errors for valid types, classes, and namespaces

[Chuxel]

While ASPX does not have deep intellisense support in VS Code, Visual Studio does. Unfortunately, right now ASPX's backing implementation for inline C# does not work with VS Live Share and this is a full feature needed to implement. This is was tagged as a bug given it's behavior, but it is effectively a full feature that is not currently supported.

Product and Version: Visual Studio 2017 Preview (15.6 Preview 3)
OS Version: Windows 10 Enterprise 64-bit
Live Share Extension Version: 0.2.58
Target Platform or Language: ASPX files in ASP.NET Web Forms projects

Steps to Reproduce / Scenario:

1. [Host] Create a new ASP.NET Web Forms Site project
2. [Host] Open Contact.aspx
3. [Host] Share
4. [Guest] Join
5. [Guest] Look at Contact.aspx

Expected: No errors visible

Actual: Page.Title and Scripts show errors (red squiggles). Other incorrect warnings are also visible. Site.master.cs is a valid CodeFile and has a green squiggle under it and webopt is a valid prefix and also has a green squiggle.

Similar to #64 for F# and previously #51 for CSHTML.

[Chuxel]

There should not be any "red squiggles" anymore as of v0.3.392/v.0.393. However full intellisense is not supported yet. Keep an eye on platform support for info on when we get this up and running.