BudgetAnalyser.LedgerBook.LedgerBucketViewController.ShowDialog C# (CSharp) Method

        public void ShowDialog([NotNull] Engine.Ledger.LedgerBook parentLedgerBook, [NotNull] LedgerBucket ledgerBucket, [NotNull] BudgetModel budgetModel)
        {
            if (parentLedgerBook == null)
            {
                throw new ArgumentNullException(nameof(parentLedgerBook));
            }

            if (ledgerBucket == null)
            {
                throw new ArgumentNullException(nameof(ledgerBucket));
            }

            if (budgetModel == null)
            {
                throw new ArgumentNullException(nameof(budgetModel));
            }

            if (LedgerBucketHistoryAnalysis == null)
            {
                LedgerBucketHistoryAnalysis = CreateBucketHistoryAnalyser();
            }
            LedgerBucketHistoryAnalysis.Analyse(ledgerBucket, parentLedgerBook);
            this.ledger = ledgerBucket;
            BankAccounts = new ObservableCollection<Account>(this.accountRepo.ListCurrentlyUsedAccountTypes());
            BucketBeingTracked = ledgerBucket.BudgetBucket;
            StoredInAccount = ledgerBucket.StoredInAccount;
            MonthlyBudgetAmount = budgetModel.Expenses.Single(e => e.Bucket == BucketBeingTracked).Amount;
            this.correlationId = Guid.NewGuid();

            var dialogRequest = new ShellDialogRequestMessage(BudgetAnalyserFeature.LedgerBook, this, ShellDialogType.OkCancel)
            {
                CorrelationId = this.correlationId,
                Title = "Ledger - " + BucketBeingTracked,
                HelpAvailable = true
            };

            MessengerInstance.Send(dialogRequest);
        }