using System;

using System.IO;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("OS: {0}", Environment.OSVersion.Platform);

        //True

        Console.WriteLine("IsRooted: {0}", Path.IsPathRooted(@"C:\test\some\file.txt"));

        Console.WriteLine("IsRooted: {0}", Path.IsPathRooted(@"\test\some\file.txt"));

        Console.WriteLine("IsRooted: {0}", Path.IsPathRooted(@"\\mynetworkshare\test\some\file.txt"));

        //False

        Console.WriteLine("IsRooted: {0}", Path.IsPathRooted(@"some\file.txt"));

        Console.WriteLine("IsRooted: {0}", Path.IsPathRooted(@"..\some\file.txt"));

        Console.WriteLine("IsRooted: {0}", Path.IsPathRooted(@".\some\file.txt"));

    }

}