Replace name of each environment variable embedded in the specified string with the string equivalent of the value of the variable in CSharp

//from w ww  .  ja v a 2 s.  c o  m
using System;

class Sample 
{
    public static void Main() 
    {
        String str;
        String nl = Environment.NewLine;
    
        String query = "My system drive is %SystemDrive% and my system root is %SystemRoot%";
        str = Environment.ExpandEnvironmentVariables(query);
        Console.WriteLine("ExpandEnvironmentVariables: {0}  {1}", nl, str);
    }
}