Solution

noun

say it: “suh-LOO-shun” /səˈluːʃən/

A Visual Studio file that groups related projects, such as an app and its tests, so they open and build together.

What is Solution in C#?

Solution — A file that groups related projects, such as an app and its test project, so Visual Studio opens them together and builds them in one go. In .NET 10 it is a .slnx file; older ones end in .sln.

dotnet new sln --name Scoreboard        # Scoreboard.slnx
dotnet sln add Scoreboard.App Scoreboard.Tests

In a sentence

• “I added the test project to the solution, so one build compiles both the app and its tests.”

Level: Apprentice · More C# terms at this level

Updated October 28, 2026