Straight Line Depreciation Table in Visual Basic 2013 Express

In my straight line depreciation program in my depreciation list box results table
1 2015 25000 4000 4000 21000
2 2016 21000 4000 8000 17000
3 2017 17000 4000 12000 13000
4 2018 13000 4000 16000 9000
5 9000 9000 4000 20000 5000


in my Depreciation Table Results
Original Price $25,000.00
Salvage Value $ 5,000.00
Estimated Years 5
Year Purchased 2015
Depreciable Cost $20,000.00
Depreciation Expense $4000.00
Total Years 5
Total Years Purchased 2020
Accumulated Depreciation 20,000
Book Value $5,000.00

in the Original Price textbox was $5,000.00 but, the correct original price is $25000.00


I have tried to talk to people how this program but, I had no success. I also did some moving the figures around but, no success. Where place the depreciable cost, depreciation expense, total years, total years purchased, accumulated depreciation and book value. I also had trouble doing that on a rich texbox doing do while statements do I use these figures?

Code:

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Public Class Form1
    Private Sub BtnExitDepreciationResults495_Click(sender As Object, e As EventArgs) Handles BtnExitDepreciationResults495.Click
        Me.Close()

    End Sub

    Private Sub BtnClearDepreciationResults495_Click(sender As Object, e As EventArgs) Handles BtnClearDepreciationResults495.Click
        Me.Price495.Text = "  "
        Me.SalvageValue495.Text = "  "
        Me.Years495.Text = "  "
        Me.YearPurchased495.Text = "  "
        Me.DepCost495.Text = "  "
        Me.DeprecExpense495.Text = "  "
        Me.TotalYears495.Text = "  "
        Me.TotalYearsPurchased495.Text = "  "
        Me.Accum495.Text = "  "
        Me.BookValue495.Text = "  "
        Me.ListBoxDepreciationResults495.Items.Clear()
        Me.ListBoxDepreciationResultsTable495.Items.Clear()
    End Sub

    Dim i As Integer
    Private Sub BtnDisplayDepreciationResults495_Click(sender As Object, e As EventArgs) Handles BtnDisplayDepreciationResults495.Click
        Dim Price495A As Double
        Dim SalvageValue495A As Double
        Dim Years495A As Integer

        Dim YearPurchased495A As Integer
        Dim DepCost495A As Double
        Dim DeprecExpense495A As Double
        Dim TotalYears495A As Integer
        Dim TotalYearsPurchased495A As Integer

        Dim Accum495A As Double
        Dim BookValue495A As Double


        If IsNumeric(Me.Price495.Text) Then
            Price495A = CDbl(Me.Price495.Text)
            If Price495A > 0 Then
                MessageBox.Show("You entered your Original Price has been Accepted                                    " & Price495A.ToString("c2") & "      Have a Good God Blessed Day        ")
            Else
                MessageBox.Show("I am sorry to tell you that you entered a negative Original Price                " & Price495A.ToString("c2") & "            " & "    Have a Good God Blessed Day        " & "            " & "  Input Error    ")
                Price495.Text = "  "
                Price495.Focus()

             
            End If

        Else
            MessageBox.Show("I am sorry to tell you that you entered an alpabetical or entered an alphanumeric and/or your left your Original Price blank                              " & Price495A.ToString("c2") & "    Please Enter Original Price          " & "      " & "    Input Error    ")
            Price495.Text = "  "
            Price495.Focus()
        End If


        If IsNumeric(Me.SalvageValue495.Text) Then
            SalvageValue495A = CDbl(Me.SalvageValue495.Text)
            If SalvageValue495A > 0 Then
                MessageBox.Show("Your Salvage Value you entered is accepted                              " & SalvageValue495A.ToString("c2") & "              " & "  Have a God Blessed Day    ")
             
            Else
                MessageBox.Show("Your Salvage Value you entered is a negative number              " & SalvageValue495A.ToString("c2") & "            " & "    Please enter Your Salvage Value Greater than zero  Have a God Bless Day              " & "      " & "  Input Error  ")
                SalvageValue495.Text = "  "
                SalvageValue495.Focus()

            End If
        Else
            MessageBox.Show("I am sorry to tell you that you entered an alpabetical or entered an alphanumeric and/or you left your Salvage Value Blank                          " & SalvageValue495A.ToString("C2") & "        " & "  Please Enter Salvage Value Amount Value              " & "          " & "      Input Error      ")
            SalvageValue495.Text = "  "
            SalvageValue495.Focus()

        End If

        If IsNumeric(Me.Years495.Text) Then
            Years495A = CInt(Me.Years495.Text)
            If Years495A > 0 Then
                MessageBox.Show("The Estimated Years you entered is a numeric is Accepted                          " & Years495A & "            " & "  Have a God Blessed Day        ")
            Else
                MessageBox.Show("The Estimated Years you entered is a negative number                                " & Years495A & "              " & "  Please Enter Estimated Years is greater than Zero Have a God Blessed Day                  " & "                    " & "          Input Error        ")
                Years495.Text = "  "
                Years495.Focus()


            End If
        Else
            MessageBox.Show("I am sorry to tell you that you entered an alpabetical or entered an alphanumeric and/or you left your Estimated Years Blank          " & Years495A & "        " & "      Please Enter Estimated Years          " & "          " & "          Input Error    ")
            Years495.Text = "  "
            Years495.Focus()


        End If

        If IsNumeric(Me.YearPurchased495.Text) Then
            YearPurchased495A = CInt(Me.YearPurchased495.Text)
            If YearPurchased495A > 0 Then
                MessageBox.Show("Your Year Purchased Amount you entered is Accepted                                " & YearPurchased495A & "        " & "Have a God Blessed  Day ")
            Else
                MessageBox.Show("Your Year Purchased Amount you entered is a negative Number                " & YearPurchased495A & "          " & " Please Enter Your Year Purchased Amount Greater than zero                " & "    Input Error    ")
                YearPurchased495.Text = "  "
                YearPurchased495.Focus()
            End If
        Else
            MessageBox.Show("I am sorry to tell you that you entered an alpabetical or entered an alphanumeric and/or you left your Years Purchased Amount              " & "                  " & YearPurchased495A & "              " & "  Please Enter Year Purchased Amount          " & "            " & "  Input Error  ")
            YearPurchased495.Text = "  "
            YearPurchased495.Focus()


        End If

        TotalYearsPurchased495A = YearPurchased495A
        DepCost495A = Price495A - SalvageValue495A
        DeprecExpense495A = DepCost495A / Years495A
        ListBoxDepreciationResults495.Items.Add("Original Price                                " & Price495A.ToString("c2"))
        ListBoxDepreciationResults495.Items.Add("Salvage Value                              " & SalvageValue495A.ToString("c2"))
        ListBoxDepreciationResults495.Items.Add("Estimated Years                            " & Years495A)
        ListBoxDepreciationResults495.Items.Add("Year Purchased                            " & YearPurchased495A)
        ListBoxDepreciationResults495.Items.Add("Depreciable Cost                          " & DepCost495A.ToString("C2"))
        ListBoxDepreciationResults495.Items.Add("Depreciation Expenes                  " & DeprecExpense495A.ToString("c2"))



        For i As Integer = 1 To Years495A
            BookValue495A = Price495A - DeprecExpense495A
            TotalYears495A += 1
            TotalYearsPurchased495A += 1
            Accum495A += DeprecExpense495A

            ListBoxDepreciationResultsTable495.Items.Add(TotalYears495A & "            " & TotalYearsPurchased495A & "            " & Price495A.ToString("c2") & "            " & DeprecExpense495A.ToString("c2") & "          " & Accum495A.ToString("C2") & "          " & BookValue495A.ToString("C2"))
            Price495A = BookValue495A
        Next



       
        ListBoxDepreciationResults495.Items.Add("Total Years                                      " & TotalYears495A)
        ListBoxDepreciationResults495.Items.Add("Total Year Purchased                    " & TotalYearsPurchased495A)
        ListBoxDepreciationResults495.Items.Add("Accumulated Depreciation          " & Accum495A.ToString("c2"))
        ListBoxDepreciationResults495.Items.Add("Book Value                                      " & BookValue495A.ToString("c2"))

        Me.Price495.Text = Price495A.ToString("c2")
        Me.SalvageValue495.Text = SalvageValue495A.ToString("c2")
        Me.Years495.Text = CInt(Years495A)
        Me.YearPurchased495.Text = CInt(YearPurchased495A)
        Me.DepCost495.Text = CDbl(DepCost495A.ToString("c2"))
        Me.DeprecExpense495.Text = CDbl(DeprecExpense495A.ToString("c2"))
        Me.TotalYears495.Text = CInt(TotalYears495A)
        Me.TotalYearsPurchased495.Text = CInt(TotalYearsPurchased495A)
        Me.Accum495.Text = CDbl(Accum495A.ToString("C2"))
        Me.BookValue495.Text = CDbl(BookValue495A.ToString("C2"))
        BookValue495A = Price495A - Accum495A
    End Sub
End Class

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can I ask in the future if I could ask about my straight line depreciation in a rich textbox every time also I make run time error it takes too much time to reveal it. What can I do about it?