Question

What is the best to determine the Microsoft OS that is hosting your ASP.NET application using the System.Environment.OSVersion namespace

I need an example for Windows XP, Windows Server 2003 and Windows Vista

Here is what I am trying to accomplish using pseudocode

switch(/* Condition for determining OS */)
{
    case "WindowsXP":
        //Do Windows XP stuff
        break;
    case "Windows Server 2003":
        //Do Windows Server 2003 stuff
        break;
    case "Windows Vista":
        //Do Windows Vista stuff
        break;
}

Answer 1

The following should work. But why do you care? Is just for informational purposes in logging or are you looking for actual capabilities being present on the target platform?

if (Environment.OSVersion.Version.Major == 5)
{
    if (Environment.OSVersion.Version.Minor == 1)
    {
             // XP
    }
    else if (Environment.OSVersion.Version.Minor == 2)
    {
             // Server 2003.  XP 64-bit will also fall in here.
    }
}
else if (Environment.OSVersion.Version.Major >= 6)
{
        // Vista on up
}