private async void Add() { if (Quantity > 0) { if (!Details.Any(a => a.ProductCode.Trim().ToLower() == SearchProduct.Trim().ToLower())) { Details.Add(new SampleDetailExtend() { Id = (Cont += 1), ProductCode = SelectedValueBp, ProductName = SystemElementList.FirstOrDefault(a => a.Code == SelectedValueBp).Description, Quantity = Quantity, User = "******" }); HeightList = (_details.Count * 45) + (_details.Count * 10); Quantity = 0; ExistProduct = false; SearchProduct = string.Empty; SystemElementList = null; MessageSearch = string.Empty; } else { MessageSearch = "El producto ya se encuentra en la Muestra"; } } else { MessageSearch = "La Cantidad ingresada debe ser mayor a 0"; } }