I want to use a code to create folders for each user o make login and who already have folder dont create. someone can help me?

I got a code in Java script to create folders but i dont know how use it for my project because i am using windows store in c#.

this is the code in Java script
 try{
    String strDirectoy ="test";
    String strManyDirectories="dir1"+File.Separator+"dir2"+File.Separator+"dir3";

    // Create one directory
    boolean success = (new File(strDirectoy)).mkdir();
    if (success) {
      System.out.println("Directory: " + strDirectoy + " created");
    }    


    // Create multiple directories
    success = (new File(strManyDirectories)).mkdirs();
    if (success) {
      System.out.println("Directories: " + strManyDirectories + " created");
    }

    }catch (Exception e){//Catch exception if any
      System.err.println("Error: " + e.getMessage());
    }