private bool getIfContainDangerousMaterials() { ConsoleMsg.ContainDangerousMaterials(); string containDangerousMaterials; do { containDangerousMaterials = Console.ReadLine(); }while(!ValidationInput.CheckDangerousMaterialsInput(containDangerousMaterials)); return(containDangerousMaterials != null && char.ToUpper(containDangerousMaterials[0]) == 'Y'); }