Reference no: EM13933075

I am working on a program that I want to use for a simple home energy data information system. I am stuck at trying to

figure out how add an inputbox to the washing machine selection that is in my listbox. I would like to add an inputbox that

allows, (only if the user selects the washing machine) the user to add the amount of water they used in gallons per hour and

how much that water costs per gallon. In addition I can't figure out how to make all of my calculations appear in a column in

my second listbox. The data that I want to appear (as soon as the user enters it) is the appliance that they select, number of

hours they are used per day and the cost. Where I am having trouble at is with the calculations and making them appear in

the listbox without the use of a calculate button control. I want the calculations to be automatic as soon as I as the user would

enter it in the textbox controls. I originally created labels for the data to appear in but I plan to remove them since I really

want the data to appear in the second listbox. Here is the code from the form1.vb:

Public Class Form1

'Class level constants

Const dblHOURS_DAY As Double = 24 'Hours a day

Dim intPowerNeeded As Integer

Private Sub txtCostPerHour_TextChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles

txtCostPerHour.TextChanged

'Declare cost per hour

Dim decCostPerHour As Decimal

decCostPerHour = CDec(txtCostPerHour.Text)

If decCostPerHour <= 0 Then

'Display out of range message

MessageBox.Show("Please enter a positive number greater than zero.")

End If

'Displays the inputted data without the use label

lblDisplayKiloWattHourCost.Text = txtCostPerHour.Text

End Sub

Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load

Dim decCostPerHour As Decimal

Dim lblDisplayKiloWattHourCost As Decimal

decCostPerHour = CDec(txtCostPerHour.Text)

lblDisplayKiloWattHourCost = CDec(decCostPerHour.ToString("n"))

End Sub

Private Sub ListBox1_SelectedIndexChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles

ListBox1.SelectedIndexChanged

Dim strOut As String

strOut = ListBox1.SelectedItem.ToString

'Create the above variable name in the label area where I need this data to be copied to.

End Sub

Private Sub txtNumberOfHours_TextChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles

txtNumberOfHours.TextChanged

lblNumberOfHoursDisplay.Text = txtNumberOfHours.Text

Dim intNumberOfHoursDisplay As Integer

Dim intCostDisplay As Integer

intNumberOfHoursDisplay = CInt(txtNumberOfHours.Text)

intCostDisplay = intNumberOfHoursDisplay * intPowerNeeded

End Sub

Private Sub strSelectedItemFromListBox_SelectedIndexChanged(ByVal sender As System.Object, ByVal e As System.EventArgs)

Handles strOut.SelectedIndexChanged

strOut.Text = lblCostDisplay.Text

End Sub

Private Sub txtPowerNeeded_TextChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles

txtPowerNeeded.TextChanged

intPowerNeeded = CInt(txtPowerNeeded.Text)

lblCostDisplay.Text = CStr(intPowerNeeded)

End Sub

End Class

Attachment:- Form1.zip