need help with option strict on

I am taking a vb.net class in college and running into a problem. I have some code that runs good but when i put in "Option strict On", I then can no longer run my program. Please help. Here is my code:

Option Strict On

Public Class hagerstownWaterBill
    Inherits System.Windows.Forms.Form

    Private Sub uiCalculateBillButton_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles uiCalculateBillButton.Click
        'Set default variables
        Const waterChargePerGallon As Double = 0.00175
        Dim CurrentReading As Double
        Dim PreviousReading As Double
        Dim gallonsUsed As Double

        'Set default variables
        Try
            CurrentReading = Me.uiCurrentReadingTextBox.Text
            PreviousReading = Me.uiPreviousReadingTextBox.Text

            'if CurrentReading >= PreviousReading then do calculations, otherwise display message
            If CurrentReading >= PreviousReading Then
                'Perform calculations
                gallonsUsed = CurrentReading - PreviousReading
                uiGallonsUsedAmtLabel.Text = Format(gallonsUsed, "N0")
                gallonsUsed = gallonsUsed * waterChargePerGallon
                uiWaterChargeAmtLabel.Text = Format(gallonsUsed, "C2")
            Else
                'Display error message
                MessageBox.Show("The current reading must be greater than or equal to the previous reading", _
                "Warning!", MessageBoxButtons.OK, MessageBoxIcon.Information)
            End If

        Catch ex As Exception
            MessageBox.Show(ex.Message, "Warning!", MessageBoxButtons.OK, MessageBoxIcon.Information)
        End Try
    End Sub

    Private Sub hagerstownWaterBill_KeyPress(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyPressEventArgs) Handles MyBase.KeyPress, uiCurrentReadingTextBox.KeyPress, uiPreviousReadingTextBox.KeyPress
        'user can only press numeric keys
        If (e.KeyChar < "0" OrElse e.KeyChar > "9") Then
            e.Handled = True
        End If
    End Sub
    Private Sub hagerstownWaterBill_TextChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles uiCurrentReadingTextBox.TextChanged, uiPreviousReadingTextBox.TextChanged
        'Clear error message
        Me.uiGallonsUsedAmtLabel.Text = ""
    End Sub
    Private Sub uiExitButton_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles uiExitButton.Click
        'Close Window
        Me.Close()
    End Sub
mappenzellarAsked:
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clockwatcherCommented:
Can you post all the places the compiler is giving you errors.  These two are easy to spot:

          CurrentReading = Me.uiCurrentReadingTextBox.Text
          PreviousReading = Me.uiPreviousReadingTextBox.Text

They should be:

          CurrentReading = cdbl(Me.uiCurrentReadingTextBox.Text)
          PreviousReading = cdbl(Me.uiPreviousReadingTextBox.Text)

But there may be others.

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mappenzellarAuthor Commented:
I am not familiar with cdbl but that did in fact do the trick. Thanks!
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Visual Basic.NET

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