.NET Core 3.0 Preview 9

.NET Core Preview 9 released today. https://github.com/dotnet/core/issues/3304 has been opened for discussion.

[Release Notes](https://github.com/dotnet/core/blob/master/release-notes/3.0/preview/3.0.0-preview9.md)
[Download](https://github.com/dotnet/core/blob/master/release-notes/3.0/preview/3.0.0-preview9-download.md)

**Blog posts**

[.NET Core](https://devblogs.microsoft.com/dotnet/announcing-net-core-3-0-preview-9/)
[ASP.NET Core](https://devblogs.microsoft.com/aspnet/asp-net-core-and-blazor-updates-in-net-core-3-0-preview-9/)

Please report any issues you find with 3.0.0 Preview 9, either responding to this issue, creating a new issue or creating a new issue in one of the following repos:

* [aspnet/AspNetCore](https://github.com/aspnet/AspNetCore) - for ASP.NET Core questions
* [aspnet/EntityFrameworkCore](https://github.com/aspnet/EntityFrameworkCore) - for Entity Framework Core questions
* [dotnet/cli](https://github.com/dotnet/cli/issues) - for CLI tools and questions
* [dotnet/corefx](https://github.com/dotnet/corefx/issues) - for API issues and questions
* [dotnet/coreclr](https://github.com/dotnet/coreclr/issues) - for runtime issues
* [dotnet/core-setup](https://github.com/dotnet/core-setup/issues) - for installer issues
* [dotnet/winforms](https://github.com/dotnet/winforms/issues) - for Winforms issues
* [dotnet/wpf](https://github.com/dotnet/wpf/issues) - for WPF issues
* [nuget/home](https://github.com/nuget/home/issues) - for NuGet questions and issues

Start with the linked .NET Core 3.0 Preview 9 release notes and download notes, then review the linked .NET Core and ASP.NET Core blog posts. The issue is an announcement and does not identify a documentation change or other concrete completion criteria.

Written by the indexing model from the issue text.