Use Path.GetFullPath
string path = Path.Combine(@"c:alphaeta", @"..gamma");
Console.WriteLine(Path.GetFullPath(path));
or the DirectoryInfo
class:
string path = Path.Combine(@"c:alphaeta", @"..gamma");
DirectoryInfo info = new DirectoryInfo(path);
Console.WriteLine(info.FullName);
Both will output:
c:alphagamma
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