Get folder name from full file path
See DirectoryInfo.Name:
string dirName = new DirectoryInfo(@"c:\projects\roott\wsdlproj\devlop\beta2\text").Name;
I think you want to get parent folder name from file path. It is easy to get.
One way is to create a FileInfo type object and use its Directory property.
Example:
FileInfo fInfo = new FileInfo("c:\projects\roott\wsdlproj\devlop\beta2\text\abc.txt");
String dirName = fInfo.Directory.Name;
Try this
var myFolderName = @"c:\projects\roott\wsdlproj\devlop\beta2\text";
var result = Path.GetFileName(myFolderName);