ลบ file หรือ Directory ทั้งหมดที่มีอยู่ใน drive ทำไงค่ะ (ภาษา vb.net หรือ C#.net ก็ได้ค่ะ)

public void DeleteFolder(string deleteFolder)
        { 
          DirectoryInfo myDirInfo;
            myDirInfo = new DirectoryInfo(deleteFolder + "/");
            DirectoryInfo[] arrFolderInfo = myDirInfo.GetDirectories("*");
			foreach (DirectoryInfo myFolderInfo in arrFolderInfo){

                DirectoryInfo delFolder = new DirectoryInfo(deleteFolder + "\\" + myFolderInfo.Name);
                Showlist("Delete Folder : " + (delFolder));
                   try{     
                        if (delFolder.Exists){
                           delFolder.Delete(true);
                        }
                    }catch (Exception ex){
                        throw ex;
                    }
				}
        }