Getting ASP.NET Version programmatically

Question

In some client machines we are having some incompatibility issues related to the .NET Framework.

When a server error is encountered, an error page is displayed. On the bottom of the page we have this information:

Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.6.1637.0 

I´ve read different posts and tried multiple things in order to get that value programmatically without success.

This is what I´ve tried:

1)

Console.WriteLine(Environment.Version.ToString());

Result:

4.0.30319.42000

2) Programatically reading:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\ASP.NET

Result:

4.0.30319.0

3) Programatically reading:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\NET Framework Setup\NDP\v4\Full

Result:

4.6.01586

As you can confirm none of those values map the ASP.NET Version showed in the error page.

So, I have two questions:

1) How can I get the ASP.NET Version programmatically?

2) I faced a case where .NET4.6 was apparently installed but ASP.NET Version was 4.0.30319 (and the suspicion is that this is causing the failure). Is there a way to upgrade only ASP.NET? Makes this any sense?

I apologize I don´t have enough reputation to add images.

Answer 1

I am able to answer to your first question.

You can receive ASP.NET version programmatically like that:

var netPath = 
System.Runtime.InteropServices.RuntimeEnvironment.GetRuntimeDirectory();
var systemWebPath = Path.Combine(netPath, "System.Web.dll");
if (File.Exists(systemWebPath))
{                
     FileVersionInfo fileVersionInfo = FileVersionInfo.GetVersionInfo(systemWebPath);
     string version = fileVersionInfo.ProductVersion;
}