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• LINQPad by Joseph Albahari (https://albahari.com), author of C# 10 in a Nutshell

“The popular interactive .NET scratchpad keeps getting better: LINQPad now supports C# 10 and .NET 6. Put an end to those hundreds of Visual Studio C# Console projects cluttering your source folder, and join the revolution of LINQPad scripters and incremental developers!”

• The .NET Programmer’s Playground
• Instantly test any C#/F#/VB snippet or program
• Query databases in LINQ (or SQL) — SQL Azure, Oracle, SQLite, Postgres & MySQL
• Enjoy rich output formatting, optional autocompletion and integrated debugging
• Script and automate in your favorite .NET language
• Super lightweight — single 20MB executable!
• Standard edition free, with no expiry

Again, you can keep tweaking your code until it does what you want, then paste working code into Visual Studio.

You can even run a full program with additional methods: just change the Language to Program, and LINQPad will wrap your code in a Main method so you can write additional methods and classes.

Need to reference custom assemblies or NuGet references? No problem: just hit F4 for the Add Reference dialog.

Additional benefits:

• LINQPad reports the execution time in the status bar, so you won't have to manually create a Stopwatch class for performance testing.
• Want to test a variation of your snippet? Ctrl+Shift+C instantly clones your snippet so you can run another version side-by-side.
• You can return to saved queries in single click, thanks to the My Queries treeview. Use LINQPad as a scripting tool!
• You can call Dump on any WPF or Windows Forms control and LINQPad will render it. This is a great way to write custom visualizers.
• In the My Queries treeview, you'll see a query called My Extensions. Here's where you can write methods and classes that will be available to all queries.

• https://www.linqpad.net/CodeSnippetIDE.aspx
• https://www.linqpad.net/FAQ.aspx
• https://www.linqpad.net/Purchase.aspx