Hi it would be extremely useful if we had the Elvis operator.

I would like to be able to create projects that contain multiple files so that I can create tutorials to teach student.
The MVC project type for example allows for multiple files. but they are all together on screen and I can't close one down to focus on say the controller.

VS Code uses Theia https://www.theia-ide.org/index.html - Perhaps you could also use this in your UI?

Such as 'Def.1.1.1', which I successfully referenced but could not use.

The error is:

Compilation error (line 13, col 21): The name 'Def' does not exist in the current context.

The site shows that the package is "on disk", but '/usr/nugetCache/def' does not contain 1.1.1.

Is there a problem?

Change the text color with Console.ForegroundColor

That the code can be used:
Console.ForegroundColor = ConsoleColor.DarkBlue;

Console.Write ("Hello");

Console.ForegroundColor = ConsoleColor.DarkRed;

Console.WriteLine ("World");

On top of each fiddle, it says "by <author's user name>". The author's username should be a link to take the user to all his/her fiddles.

https://dotnetfiddle.net/jsV9f5

It would be nice to see form submits pass through a controller method to another view. Currently I'm just throwing an exception to see passed values (https://dotnetfiddle.net/jZQKsM).

Any plans to support an Azure Function like interface with files area for run.csx, function.json?

Lots of C# developers out there who can't afford to have an Azure Tenant that can help collaborate on our projects.

View IL feature doesn't work.

As far my experience goes using dotnetfiddle.net, the "Tidy Up" functionality only remove unnecessary lines reducing code readability

It would come in handy to be able to click either the .NET Fiddle title in the top left corner, or a New Fiddle button to start over. Now, you have to refresh the page or go back to http://dotnetfiddle.net to create a new fiddle.

Support MyGet as a source for nuget packages, example:
// @myget: mypackage -Version 2.7.0

Make it so that the code can not be altered, just viewed

If you move the cursor to the opening tag highlight the closer tag

when we write a code also we need to debug , it is useful to resolve issue very fast.

It would be nice to have a user page that lists the Fiddles that we have created. A main page of sorts.

Mobile/Desktop versions switch button is needed on main menu.

Provide a method to store environment variables per our account that couldn't be seen by anyone we shared the code with.

Make them accessible in code with this: https://docs.microsoft.com/en-us/dotnet/api/system.environment.getenvironmentvariable.