How to detect IIS version in C#

In this blog I will show how to detect the IIS version using C#. We are going to make use of RegistryKey class which is the encapsulation for registry. Below is the sample code to detect the IIS version:

using System;
using Microsoft.Win32;

namespace Sample
{
    public partial class _Default : System.Web.UI.Page
    {

        protected void Page_Load(object sender, EventArgs e)
        {

            Version version = GetIISVersion();
            Response.Write(version);
           
        }
        public Version GetIISVersion()
        {
            using (RegistryKey key =
            Registry.LocalMachine.OpenSubKey(@"Software\Microsoft\InetStp", false))
            {
                if (key == null) return new Version(0, 0);
                int majorVersion = (int)key.GetValue("MajorVersion", -1);
                int minorVersion = (int)key.GetValue("MinorVersion", -1);
                if (majorVersion == -1 || minorVersion == -1) return new Version(0, 0);
                return new Version(majorVersion, minorVersion);
            }
        }
    }
}