The easiest way to create a Blazor project (assuming that you've kept your version of Visual Studio 2017 up-to-date) is to use File | New | Project, pick the ASP.NET Core Web Application project type, ...

Learn how to use IAsyncEnumerable in C# to easily filter, aggregate, transform, project, or otherwise process continuous streams of data asynchronously.

Assuming Visual Studio 2019 is installed in your system, follow the steps outlined below to create a new .NET Core console application project in Visual Studio. Launch the Visual Studio IDE.