How to get only directory name from SaveFileDialog.FileName

Use:

System.IO.Path.GetDirectoryName(saveDialog.FileName)

(and the corresponding System.IO.Path.GetFileName). The Path class is really rather useful.

You could construct a FileInfo object. It has a Name, FullName, and DirectoryName property.

var file = new FileInfo(saveFileDialog.FileName);
Console.WriteLine("File is: " + file.Name);
Console.WriteLine("Directory is: " + file.DirectoryName);