Answer by Szybki for How to get relative path from absolute path

The function that uses URI returned "almost" relative path. It included directory that directly contains the file which relative path I wanted to get.

Some time ago I wrote a simple function that returns relative path of folder or file, and even if it's on another drive, it includes the drive letter as well.

Please take a look:

    public static string GetRelativePath(string BasePath, string AbsolutePath)    {        char Separator = Path.DirectorySeparatorChar;        if (string.IsNullOrWhiteSpace(BasePath)) BasePath = Directory.GetCurrentDirectory();        var ReturnPath = "";        var CommonPart = "";        var BasePathFolders = BasePath.Split(Separator);        var AbsolutePathFolders = AbsolutePath.Split(Separator);        var i = 0;        while (i < BasePathFolders.Length & i < AbsolutePathFolders.Length)        {            if (BasePathFolders[i].ToLower() == AbsolutePathFolders[i].ToLower())            {                CommonPart += BasePathFolders[i] + Separator;            }            else            {                break;            }            i += 1;        }        if (CommonPart.Length > 0)        {            var parents = BasePath.Substring(CommonPart.Length - 1).Split(Separator);            foreach (var ParentDir in parents)            {                if (!string.IsNullOrEmpty(ParentDir))                    ReturnPath += ".."+ Separator;            }        }        ReturnPath += AbsolutePath.Substring(CommonPart.Length);        return ReturnPath;    }