Loop through sub-directories

Hi,

I want to loop through the sub-directories of one given folder. How to correct the following problems?

            dir = args[0];
            ...
            try
            {

                string [] dirlvl2Ent = Directory.GetDirectories(dir);
                for (string dirlvl2 in dirlvl2Ent)
                {

                }

Error   1       ; expected      F:\App8\Program.cs      50      37      ProcessSWFile
Error   2       ; expected      F:\App8\Program.cs      50      40      ProcessSWFile
Error   3       Only assignment, call, increment, decrement, await, and new object expressions can be used as a statement       F:\App8\Program.cs      50      40      ProcessSWFile

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Many Thanks & Best Regards, Hua Min