Add Web Api 2.2 to list of project type

Support for System.ServiceModel would be very helpful.

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.

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!

allow us to

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

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

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)

There exists five redundant horizontal tabs 0x09 at the second line of all C# templates (Framework, Core, and Roslyn). They have existed for at least a year now.
I am hoping they can be removed.
Thanks.

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.

Support for System.Diagnostics.Debug.Assert could be added. Given that it's an internal verification system that fails when the assertion is incorrect, it could be helpful to at least throw a message in the output window when an assertion wasn't working

I tried creating an account on your site and kept getting System Error 500 after I entered my e-mail, password and display name. I tried turning off my AdBlock and it still happened. I never received any account confirmation e-mails.

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"

So that we can create asynchronous sample in DotNetFiddle

Was just trying to run through the c# tutorial and realised the fiddler doesn't allow you to run code with Console.Read etc. Would be a nifty feature :)

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).

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");

Allow you to work on whole projects instead of a single at a time. Having the tree listed on the side allowing you to jump from page to page and looking more like a whole project. Also being able to download your project when it's completed