For legacy ASP.NET applications built on the .NET Framework, the .NET Framework version can be changed in the Control Panel by clicking the ASP.NET Version icon in the Site Tools section.
Important:
If your application is a modern .NET / .NET Core–based application (for example, ASP.NET Core, .NET 6/7/8), there is no version selector in the Control Panel. The ASP.NET Version selector applies only to legacy .NET Framework applications.
Available .NET Framework Options
When using a legacy ASP.NET application, the following options are available:
.NET 4.x
.NET 2.0 / 3.0 / 3.5 SP1
Important Notes
Only one .NET Framework version can be configured per site.
You cannot run .NET 4.x and earlier .NET Framework versions simultaneously on the same site.
This setting has no effect on ASP.NET Core / modern .NET applications, which are configured and run independently of the legacy ASP.NET Framework selector.
Article ID: 814, Created: 5/13/2010 at 3:14 PM, Modified: 1/22/2026 at 10:17 AM