Visual studio is syntax checking my C# as Visual Basic

Question

I've been testing some c# code in visual studio and when I opened visual studio this morning my project was full of red lines.

Demanding class declarations to be closed with End class
Red lines under semicolons
Variable declaration without an AS clause
Ctrl+K, CTRL+C Gives visual basic comments E.g. 'green text
//C# comments get red squiggly lines under them.

These are clearly visual basic errors which means for some reason it's trying to make my C# into VB.

I've been trying to find out what on earth to search for but no luck so far.

When I build the project there is no problem. Just the syntax errors in visual studio with red squiggly lines.

If you create a new C# project (new instance of VS, new solution), does it do the same in that? Also, what version/edition of Visual Studio? Have you already e.g. attempted to run a repair on it? — Damien_The_Unbeliever
– Damien_The_Unbeliever, Commented May 5, 2017 at 11:59
It did not happen in a new project. Though I'm uncomfortable not knowing what caused it. — Stian
– Stian, Commented May 5, 2017 at 12:25

Francois Borgies · Accepted Answer · 2017-05-05 11:59:36Z

0

Have you try to :

close VS
delete .SUO file
restart VS

The SUO file is a hidden file,, which is placed in the same folder as the SLN file. It contains a lot of information such as which files are currently open in the IDE, some local settings, etc.

More Information about that.

answered May 5, 2017 at 11:59

Francois Borgies

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2 Comments

Stian Over a year ago

Restarting helped but it did so before and then snapped back to the problem so I expect it might do so again. There is a small dropdown above the code to the upper left that says "Miscellaneous files" with a c# icon to it's left. When that is there the code is fine. After a while something happends and it changed to 1_filename.aspx.cs and then to 2_filename.aspx.cs and I have no idea what i did but the errors were back.

Francois Borgies Over a year ago

Miscellaneous files means VS doesn't recognize your file as a part of your project. So you can try to exclude this file in Solution Explorer, Right click on your projetc folder, Add, Existing file and select your file.

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