c# - string.IsNullOrEmpty to combine another directory -

i want ask find directory name (folder1) combine. if directory not exist, want find directory name (folder2) combine. should put it? here code:

    public static string datadirectory     {                  {              if (string.isnullorempty(directory))                 return null;              return path.combine(directory, "data/folder1");          }      } 

thanks.

directory.exists should work fine

public static string datadirectory {          {          if (string.isnullorempty(directory))             return null;          // use path.combine 1 time          string firstfolder = path.combine(directory, "data/folder1");          if(directory.exists(firstfolder)             return path.combine(firstfolder);         else             return path.combine(directory, "data/folder2");     }  }