public static string FirstPage(this TicketQuery @this) =>
 @this.PageNumber != 1 ? @this.ToQueryString(1, @this.PageSize) : null;
 public static string NextPage(this TicketQuery @this, int totalPages) =>
 @this.PageNumber < totalPages? @this.ToQueryString(@this.PageNumber + 1, @this.PageSize) : null;
 public static string PreviousPage(this TicketQuery @this) =>
 @this.PageNumber > 1 ? @this.ToQueryString(@this.PageNumber - 1, @this.PageSize) : null;
 public static string LastPage(this TicketQuery @this, int totalPages) =>
 @this.PageNumber != totalPages? @this.ToQueryString(totalPages, @this.PageSize) : null;