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Creates a relative path from one file or folder to another

using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.IO; using System.Collections.Specialized; namespace Genuilder.Extensibility {   public class PathUtil   {     /// <summary>     /// Creates a relative path from one file     /// or folder to another.     /// </summary>     /// <param name="fromDirectory">     /// Contains the directory that defines the     /// start of the relative path.     /// </param>     /// <param name="toPath">     /// Contains the path that defines the     /// endpoint of the relative path.     /// </param>     /// <returns>     /// The relative path from the start     /// directory to the end path.     /// </returns>     /// <exception cref="ArgumentNullException"></exception>     public static string RelativePathTo(       string fromDirectory, string toPath)     {       if(fromDirectory == null)         throw new ArgumentNullException("fromDirectory");       if(toPath == null)         throw new ArgumentNullException("toPath");       bool isRooted = Path.IsPathRooted(fromDirectory)         && Path.IsPathRooted(toPath);       if(isRooted)       {         bool isDifferentRoot = string.Compare(           Path.GetPathRoot(fromDirectory),           Path.GetPathRoot(toPath), true) != 0;         if(isDifferentRoot)           return toPath;       }       StringCollection relativePath = new StringCollection();       string[] fromDirectories = fromDirectory.Split(         Path.DirectorySeparatorChar);       string[] toDirectories = toPath.Split(         Path.DirectorySeparatorChar);       int length = Math.Min(         fromDirectories.Length,         toDirectories.Length);       int lastCommonRoot = -1;       // find common root       for(int x = 0; x < length; x++)       {         if(string.Compare(fromDirectories[x],           toDirectories[x], true) != 0)           break;         lastCommonRoot = x;       }       if(lastCommonRoot == -1)         return toPath;       // add relative folders in from path       for(int x = lastCommonRoot + 1; x < fromDirectories.Length; x++)         if(fromDirectories[x].Length > 0)           relativePath.Add("..");       // add to folders to path       for(int x = lastCommonRoot + 1; x < toDirectories.Length; x++)         relativePath.Add(toDirectories[x]);       // create relative path       string[] relativeParts = new string[relativePath.Count];       relativePath.CopyTo(relativeParts, 0);       string newPath = string.Join(         Path.DirectorySeparatorChar.ToString(),         relativeParts);       return newPath;     }   } }