public ExpenseViewModel(DBDataOperation myBd, System.Windows.Window w2) { bd = myBd; ExpenseGuide = bd.GetALLEXPENSE_GUIDES(App.id); EXPENSEDate = DateTime.Now; EXPENSESize = "0"; EXPENSEDate2 = DateTime.Now; EXPENSEDate1 = new DateTime(DateTime.Now.Year, DateTime.Now.Month, App.id); ExpenseDataGrid = bd.GetALLEXPENSESSELECT(EXPENSEDate1, EXPENSEDate2, App.id); w = w2; double r = 0; for (int i = 0; i < ExpenseDataGrid.Count; i++) { r += (double)ExpenseDataGrid[i].expense_size; } EXPENSESum = "Итог за выбранный период: " + r.ToString(); }