Problem with deleting and renaming c# script

[111ukasz111]

Godot version:
3.0 stable mono version

OS/device including version:

windows10 geforce 920m

Issue description:

If I delete or rename c# scrip (delete from inspector and resources) Godot still want to found this files.

This is the project with this problem.
C#.zip

Steps to reproduce:

Godot just shouldn't want to found deleted scripts.
Minimal reproduction project:

[Zylann]

Sounds like yet another occurrence of #12415
Unlike GDScript and other assets, C# assemblies get compiled using project files. You have to update those, deleting or renaming C# files is not enough (this is usually what an IDE does for you).
Your project file still references inexisting files.

Another important detail:
The file name must match the class name inside. You cannot name a file C#test.cs, because # is not an allowed character in class names.

[neikeq]

Just for clarification, the plan is to make Godot update the project file when deleting or renaming C# files from the Godot editor but, like I mention in that issue, there is another issue blocking that right now.

[akien-mga]

Duplicate of #12917.