Hi @N,
Startup.cs is a part of the OWIN authorization package.You need to install the Microsoft.Owin.Host.SystemWeb package from NuGet.
From the Tools menu, select NuGet Package Manager, then select Package Manager Console. In the Package Manager Console window, type the following command:
install-package Microsoft.Owin.Host.SystemWeb –Pre
Then add the following code:
public class Startup
{
public void Configuration(IAppBuilder app)
{
}
}
Best regards,
ASP.NET MVC Startup
Best regards,
Lan Huang
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