C# WPF, Access Parent Window Method from Child Window

For access parent window method from child window, first make parent window method as PUBLIC, then follow below code for child window.

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//Declear ParentWindow as GlobalPreview SupplierDueListUI globalPrewindow; public SupplierDueCollectionUI(SupplierDueListUI prewindow) { InitializeComponent(); globalPrewindow = prewindow; // Initial prewindow } private void btnUpdatePayment_Click(object sender, RoutedEventArgs e) { PurchaseInfo purchaseInfoObj = new PurchaseInfo(); purchaseInfoObj.Id = this._purchaseInfoObj.Id; purchaseInfoObj.ProductId = this._purchaseInfoObj.ProductId; purchaseInfoObj.SupplierId = this._purchaseInfoObj.SupplierId; purchaseInfoObj.TotalDue = Convert.ToInt32(txtTotalDue.Text); purchaseInfoObj.TotalPay = Convert.ToInt32(txtTotalPay.Text); if (purchaseInfoObj.TotalDue <= 0) { purchaseInfoObj.IsFullPaid = true; } _purchaseManagerObj.UpdatePurchasePayment(purchaseInfoObj); globalPrewindow.LoadAllPurchaseDueBill(); //Load Parent window method MessageBox.Show("Successfully Updated", "Success!", MessageBoxButton.OK, MessageBoxImage.Information); this.Close(); }