Decimal to integer conversion error - vb.net

Question

I'm working on a school project using VIsual Studio 2015, the assignment is to create GUI "Commute Calculator" with three options for mode of transportation. I've wrote the code following the instructions in my textbook but am getting the following error:
"BC30057 Too many arguments to 'Private Function CarFindCost(intCommuteChoice As Integer, intDays As Integer) As Decimal'."
I'm a newbie to vs, but based on the error I believe the problem is with how I declared variables. I googled how to convert an integer to decimal, but haven't found anything that worked. The code is lengthy, but I included it all as an FYI. The error is in the private sub btnCommute and appears to be tied to three private functions: CarFindCost, BusFindCost and TrainFindCost. How to I fix it so I don't get errors on the variable intLength in the private sub bthCommute?
Option Strict On
Public Class frmCommuteCalc
Dim intCommuteChoice As Integer
Dim strSelectedMode As String = ""
Private _strGas As Integer
Private _strMiles As String = "Enter the total miles for a round trip: "
Private _strMilesPerGallon As Double = 2.15
Private _strDailyParking As Decimal = 10
Private _strMonthlyParking As Decimal
Private _strMonthlyUpkeep As Decimal = 112
Private _strRTBusFare As String = "Round trip bus fare is "
Private _strRTTrainFare As String = "Round trip train fare is "
Private _StrDays As String = "Enter the number of days worked per month: "
Private _intTrainFare As Integer
Private Sub frmCommuteCalc_Load(sender As Object, e As EventArgs) Handles MyBase.Load
Threading.Thread.Sleep(5000)
End Sub
Private Sub cboCommuteMethod_SelectedIndexChanged(sender As Object, e As EventArgs) Handles cboCommuteMethod.SelectedIndexChanged
Dim intCommuteChoice As Integer
intCommuteChoice = cboCommuteMethod.SelectedIndex()
lstCommute.Items.Clear()
Select Case intCommuteChoice
Case 0
Car()
Case 1
Train()
Case 2
Bus()
End Select
lblDays.Visible = True
lblMiles.Visible = True
lblLength.Visible = True
txtDays.Visible = True
'txtMonthlyTotal.Visible = True
End Sub
Private Sub btnCompute_Click(sender As Object, e As EventArgs) Handles btnCompute.Click
Dim intCommuteChoice As Integer
Dim intDaysPerMonth As Integer
Dim decTotalCost As Decimal
Dim intLength As Integer = 0
Dim strSelectedMode As String = ""
Dim blnNumberInDaysIsValid As Boolean = False
Dim blnCommuteMethodIsSelected As Boolean = False
blnNumberInDaysIsValid = ValidateNumberInDays()
intCommuteChoice = ValidateCommuteSelection(blnCommuteMethodIsSelected, strSelectedMode)
If (blnNumberInDaysIsValid And blnCommuteMethodIsSelected) Then
intDaysPerMonth = Convert.ToInt32(txtDays.Text)
intCommuteChoice = cboCommuteMethod.SelectedIndex()
Select Case intCommuteChoice
Case 0
decTotalCost = CarFindCost(intCommuteChoice, intDaysPerMonth, intLength)
Case 1
decTotalCost = BusFindCost(intCommuteChoice, intDaysPerMonth, intLength)
Case 2
decTotalCost = TrainFindCost(intCommuteChoice, intDaysPerMonth, intLength)
End Select
End If
End Sub
Private Function intLength() As Object
Throw New NotImplementedException()
End Function
Function ComputeCommuteCost(ByVal decMiles As Decimal, ByVal decGallons As Decimal) As Decimal
Dim decMilage As Decimal
decMilage = decMiles / decGallons
Return decMilage
End Function
Private Sub Car()
lstCommute.Items.Add(_strMiles)
lstCommute.Items.Add(_strMilesPerGallon)
lstCommute.Items.Add(_StrDays)
lstCommute.Items.Add(_strMonthlyParking)
lstCommute.Items.Add(_strMonthlyUpkeep)
End Sub
Private Sub Bus()
lstCommute.Items.Add(_strRTBusFare)
lstCommute.Items.Add(_StrDays)
End Sub
Private Sub Train()
lstCommute.Items.Add(_StrDays)
lstCommute.Items.Add(_strRTTrainFare)
End Sub
Private Function ValidateNumberInDays() As Boolean
Dim intDays As Integer
Dim blnValidityCheck As Boolean = False
Dim strNumberInDaysMessage As String = "Please enter the No. of days per month you will be commuting "
Dim strMessageBoxTitle As String = "Error"
Try
intDays = Convert.ToInt32(txtDays.Text)
If intDays >= 1 And intDays <= 21 Then
blnValidityCheck = True
Else
MsgBox(strNumberInDaysMessage, , strMessageBoxTitle)
txtDays.Focus()
txtDays.Clear()
End If
Catch Exception As FormatException
MsgBox(strNumberInDaysMessage, , strMessageBoxTitle)
txtDays.Focus()
txtDays.Clear()
Catch Exception As OverflowException
MsgBox(strNumberInDaysMessage, , strMessageBoxTitle)
txtDays.Focus()
txtDays.Clear()
Catch Exception As SystemException
MsgBox(strNumberInDaysMessage, , strMessageBoxTitle)
txtDays.Focus()
txtDays.Clear()
End Try
Return blnValidityCheck
End Function
Private Function ValidateCommuteSelection(ByRef blnDays As Boolean, ByRef strDays As String) As Integer
Dim intCommuteChoice As Integer
Try
intCommuteChoice = Convert.ToInt32(lstCommute.SelectedIndex)
strDays = lstCommute.SelectedItem.ToString()
blnDays = True
Catch Exception As SystemException
MsgBox("Select a commute mode", , "Error")
blnDays = False
End Try
Return intCommuteChoice
End Function
Private Function CarFindCost(ByVal intCommuteChoice As Integer, ByVal intDays As Integer) As Decimal
Dim decDaysPerMonth As Decimal
Dim decMiles As Decimal
Dim decMilesPerGallon As Decimal = 2
Dim decGasTotal As Decimal
Dim decDailyParking As Decimal = 10
Dim decMonthlyParking As Decimal
Dim decMonthlyUpkeep As Decimal = 112
Dim decFinalCost As Decimal
Dim intLength As Integer = 0
decMiles = Convert.ToDecimal(txtMiles.Text)
decMilesPerGallon = Convert.ToDecimal(txtGallons.Text)
decGasTotal = decMilesPerGallon * decMiles
decMonthlyParking = Convert.ToDecimal(lblLength.Text)
decMonthlyParking = decDailyParking * decDaysPerMonth
decFinalCost = Convert.ToDecimal(lblLength.Text)
decFinalCost = decGasTotal + decMonthlyUpkeep + decMonthlyParking
Return decFinalCost
End Function
Private Function BusFindCost(ByVal intCommuteChoice As Integer, ByVal intDays As Integer) As Decimal
Dim intLength As Integer = 0
Dim decDaysPerMonth As Decimal
Dim decBusFarePerDay As Decimal = 4
Dim decFinalCost As Decimal
decBusFarePerDay = Convert.ToDecimal(txtMonthlyTotal)
decFinalCost = decBusFarePerDay * decDaysPerMonth
Return decFinalCost
End Function
Private Function TrainFindCost(ByVal intCommuteChoice As Integer, ByVal intDays As Integer) As Decimal
Dim intLength As Integer = 0
Dim decDaysPerMonth As Decimal
Dim decTrainFarePerDay As Decimal = 18
Dim decFinalCost As Decimal
decTrainFarePerDay = Convert.ToDecimal(txtMonthlyTotal)
decFinalCost = Convert.ToDecimal(txtMonthlyTotal)
decFinalCost = decDaysPerMonth * decTrainFarePerDay
Return decFinalCost
End Function
End Class

Answer 1

In:
Select Case intCommuteChoice ... End Select
in each case; call function CarFindCost with 3 parameters y you have declared with only 2.