Function Procedure

I need to write a Function Procedure that will produce an amount displayed in a TaxLabel after calling it from my menu item calculate event.

Code:

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Private Function TaxAmount(ByVal TaxAmountDecimal As Decimal) As Decimal
        'Declare variable for calculations.
        Dim OutputSubtotal_Decimal As Decimal
        'Determine tax amount.
        Return 0.08D * OutputSubtotal_Decimal
    End Function

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Code:

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Dim TaxDecimal As Decimal
        Dim AmountDue_Decimal As Decimal
        Dim CarSalesPrice_Decimal As Decimal
        Dim Accessories_Decimal As Decimal
        Dim OutputSubtotal_Decimal As Decimal
        Dim OutputTotal_Decimal As Decimal
        Dim TaxAmount_Decimal As Decimal
        Dim TradeInAllowance_Decimal As Decimal

---

Code:

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OutputSubtotal_Decimal = CarSalesPrice_Decimal + Accessories_Decimal
                OutputTotal_Decimal = OutputSubtotal_Decimal + TaxDecimal
                AmountDue_Decimal = OutputTotal_Decimal - TradeInAllowance_Decimal
                TaxDecimal = OutputSubtotal_Decimal + TaxAmount_Decimal

---

Code:

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AmountLabel.Text = AmountDue_Decimal.ToString("c2")
                AccessoriesLabel.Text = Accessories_Decimal.ToString
                OutputSubTotalLabel.Text = OutputSubtotal_Decimal.ToString
                TaxLabel.Text = TaxAmount(Decimal.Parse _
                                          (TradeInAllowanceTextBox.Text)).ToString
                OutputTotalLabel.Text = OutputTotal_Decimal.ToString
                TradeInAllowanceTextBox.Text = TradeInAllowance_Decimal.ToString

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I'm only getting: $0.00 in the TaxLabel? After stepping thru the program, I found the error is in the, Function statement. After following several different examples, I'm still not getting the proper tax amount displayed?

I have not gone through all your code. Just the TaxAmount Function. I have found problems with it.
- The function takes a parameter (ByVal TaxAmountDecimal As Decimal) but it does not use it at all.
- It declares a variable Dim OutputSubtotal_Decimal As Decimal but never assigns it a value
- Returns the value of 0.08 times an empty variable.

maybe this works:

vb.net Code:

Private Function TaxAmount(ByVal TaxAmountDecimal As Decimal) As Decimal
        Return 0.08D * TaxAmountDecimal 
End Function