public ChangeShelfNumberStatusCodes ChangeShelfNumber(int shelfID, int shelfNumber)
{
var currentShelf = shelfManager.GetShelfByShelfId(shelfID);
if (currentShelf == null)
{
return(ChangeShelfNumberStatusCodes.NoSuchShelf);
}
if (currentShelf.ShelfNumber == shelfNumber)
{
return(ChangeShelfNumberStatusCodes.CanNotChangeToSameNumber);
}
shelfManager.ChangeShelfNumber(shelfID, shelfNumber);
return(ChangeShelfNumberStatusCodes.Ok);
}