private string CheckExistCollectionLink(string Str) { string result = string.Empty; if (Str != null) { result = Str; int stt = 0; bool rs = false; while (rs == false) { stt++; if (!controller.CheckExistCollectionLink(ref rs, result)) { result = string.Empty; break; } if (!rs) { result = Str + "-" + stt; } } } return(result); }