Sometimes I need to check a code that works with local timezone which should be different from UTC. It would be great to have an ability to specify timezone in that cases. Thank you!

Simple test:

static (int, int) Foo(int i)
{
return (i+2, 1*2);
}

Current "result" :
Predefined type 'System.ValueTuple`2' is not defined or imported

Expected:
To compile (and work of course :-)

This includes updating "4.7.2" "Compiler" to accept C# 7.x and at least linking the proper dll with ValueTuple-a for "Roslyn 2.0"

Why would you make a Nuget Header Directive available for C# but not for VB.Net?

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

Such as controller or class or new .cHTML ...

Allow the usage of debugging such as stepping into a function, out of a function, run, memory mapping, local variables and the whole nine yards. It is vital if you don't want users to write constantly Console.WriteLine() statements.

Kindly, add debugging!

Monaco-editor is MIT licensed and made by Microsft.
It's the same text editor used in VSCode, and it is open source!
It also has many interesting features like code diff and editor customization.

See more here:
https://github.com/Microsoft/monaco-editor
https://microsoft.github.io/monaco-editor/playground.html

Please give us inverted color theme, most developers are working with "white on black"

Roslyn 2.0 is currently in pre-release state. As we get close to RTM, dotnetFiddle will be quite useful to try or demo C# 7 features.

We need the same quick keyboard shortcuts as visual studio...
CTRL+D - Duplicate line
CTRL+K+C - Comment out line
CTRL+K+U - Uncomment line
ALT+ENTER - Automatically add or suggest missing namespace reference and add usings to the class (like resharper)

Given that MS have stopped supporting 4.5.1 and dotnet core has been released, it would be a good time to update the examples.

I would love to use .NET Fiddle in the documentation pages for my OSS projects, but I can't install the packages (I think because of the Framework verisons)

Full roslyn release support

Whenever I add Json.NET as a nuget project, version 6.0.0.0 is attached rather than the selected version. For instance, in this fiddle: https://dotnetfiddle.net/6LyfRc the latest release version is selected, version 7.0.1, but "Console.WriteLine("Json.NET version: " + typeof(JToken).Assembly.FullName);" actually shows 6.0.0.0 was loaded.

Libraries should be automatically included just like an IDE does.

For example: For some of the functions I have to:
"Imports Microsoft.VisualBasic" <--- example functions: Ubound, Lbound

And if i want to use regex then i have to include this:
"Imports System.Text.RegularExpressions"

There should be an option to automatically include all imports and remove unused imports.

In many cases I'd love to be able to have multiple files in a single fiddle so I don't have to throw all my classes in a single file and thus making it harder to read/understand.

Being able to have many files would greatly benefit explaining complex problems/scenarios.

Sometimes it'd be helpful to easily download the source code of a dotnetfiddle paste, either a single file or the whole paste (e.g. all files from a MVC "project")