private void AddIncomeData()
 {
     _queryHandler.Add(IncomeInfo);
     UpdateData();
 }
 private void AddExpenseData()
 {
     Expenses.Clear();
     _queryHandler.Add(ExpenseInfo);
     PopulateData();
 }
 private void AddInvestmentData()
 {
     _investments.Add(InvestmentInfo);
     _queryHandler.Add(InvestmentInfo);
     InvestmentInfo = new Investment();
 }