Some of us who have joined the "dark side" of the force enjoy finding at least minimal Vi emulation modes, with most common edit operations available. However, a more complete version of Vi emulation would be nice, but adding regex would be drop-in, right?

I would like to embed the Widget on my and to preform functions on it such as load a snippet to the editor or append and remove lines.
This would allow me to create tutorials like tryfsharp.org

Why is the list limited to 10 fiddles? We should be able to see all of them, or at least have a page size option.

Could you add support for snippets? E.g. typing 'ctor' and pressing 'Tab' key 2 times should generate a class constructor just as it does in Visual Studio.
For some developers it could increase productivity.

please! Make app for windows phone. It will be wonderfull!

I'd like to have an option do not use "Console.WriteLine"...

Instead of
===============================
using System;
using System.Globalization;
using System.Text.RegularExpressions;

public class Program
{
public static void Main()
{
Console.WriteLine("Hello World");
Console.WriteLine(DateTime.Now.ToString("d", CultureInfo.CreateSpecificCulture("es-CL")));
Console.WriteLine(Regex.Replace("tot{o}", "{O}", "*", RegexOptions.IgnoreCase));
}
}
===============================

use simplified code like:
===============================
using System;
using System.Globalization;
using System.Text.RegularExpressions;

?"Hello World"
?DateTime.Now.ToString("d", CultureInfo.CreateSpecificCulture("es-CL")))
?Regex.Replace("tot{o}", "{O}", "*", RegexOptions.IgnoreCase)
===============================

Please allow users to have default templates and custom usings on loading.
Different users use different nuget packages and namespaces and want to have them declared when launching the website instead of having to add them manually each time anew.

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.

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!

So that we can create asynchronous sample in DotNetFiddle

This is especially valuable with MVC fiddle type as one cannot add additional views or define their own routing.

allow us to

1) View the compiled razor
2) allow code folding of codetags and collapse/expand code for readability

Add Web Api 2.2 to list of project type

ScriptCS has a syntax for loading assemblies and works better as a single file. I don't know if you plan on allowing .NET Fiddles (?...is that the plural of the thing you make in .NET Fiddle?) to load other assemblies, but I think it would be really cool to be able to do that.

Currently, dotNetFiddle throws when trying to use Akka.NET.
There is an error message saying that some methods in JSON.NET are missing.
We would love to have the ability to run live Akka samples from our docs site.

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)

Please enable vim key bindings. VsVim is one of the most downloaded Visual Studio extension, which is an indication of Vim key binding's popularity among .net devs.

The following paste is an example of code that compiles in visual studio that does not appear to be supported by dotnetfiddle: https://dotnetfiddle.net/224Hvk

I was just making a quick draft to make sure I understood the way this kind of assignment behaved to find it wouldn't compile on dotnetfiddle