With LINQPad, you can cache intermediate data with Util.Cache. Edit and re-run your query without recomputing previous results.

This provides the performance benefits of a REPL (Read-Evalulate-Print-Loop), while making it easy to keep track of what you're doing.

LINQPad’s Dump method is famous for its capacity to eat almost anything!

Tuned with numerous heuristics, it intelligently walks object graphs for the best possible output. It even turns lazy objects into hyperlinks and asynchronous values into placeholders whose content materializes in the future!

Images and bitmaps render as images and bitmaps, and types from Reactive Extensions and Dataflow fully animate.

Dump any WPF or Windows Forms object and it will actually render.

Call the .Chart extension method to output data as a chart, using LINQPad's inbuilt charting engine.

And when you need a traditional data grid or debugger watch window, it’s there, too.

With its support for advanced C# features such as async / await and unsafe, LINQPad is capable of serious rapid coding work.

Such as writing a neural network from scratch!

Import other queries or .cs files with the #load directive.

Reference project assemblies and use LINQPad as an interactive test harness. Or use LINQPad to provide instant entry points into any part of your solution.

Use LINQPad for build scripts and to automate cloud management tasks. LINQPad includes an integrated password manager for securely storing API keys, and an OAuth frontend for multifactor authentication that preserves tokens across executions.

Step through your code with a lightweight debugger, and move around quickly with symbol navigation, outlining and bookmarking.

LINQPad is also a great way to learn C#: it comes with all 1300 examples from the book, C# 12 in a Nutshell, as well as interactive samples from Jon Skeet's C# in Depth.