My code keeps coming out to zero and I am not seeing what I am doing wrong.


Option Strict On
Option Explicit On

Public Class frmWallpaper

Private Sub CalcRolls(ByVal decArea As Decimal, ByVal decRolls As Decimal, ByVal decRollCoverage As Decimal)

'Calculate output of single rolls

decRolls = CDec(decArea / decRollCoverage)

End Sub


Private Sub btnCalc_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnCalc.Click
'Input Variables
Dim decLength As Decimal
Dim decWidth As Decimal
Dim decHeight As Decimal
Dim decRollCoverage As Decimal

'Processing and Output Variables
Dim decPerimeter As Decimal
Dim decArea As Decimal
Dim decRolls As Decimal

'Validation Variables
Dim blnIsConvertedLength As Boolean
Dim blnIsConvertedWidth As Boolean
Dim blnIsConvertedHeight As Boolean
Dim blnIsConvertedRollCoverage As Boolean

'Assign Variables
blnIsConvertedLength = Decimal.TryParse(txtLength.Text, decLength)
blnIsConvertedWidth = Decimal.TryParse(txtWidth.Text, decWidth)
blnIsConvertedHeight = Decimal.TryParse(txtHeight.Text, decHeight)
blnIsConvertedRollCoverage = Decimal.TryParse(txtRollCoverage.Text, decRollCoverage)

'Get Single Rolls
If blnIsConvertedLength And blnIsConvertedWidth And blnIsConvertedHeight And blnIsConvertedRollCoverage = True Then
If decLength > 0 And decWidth > 0 And decHeight > 0 And decRollCoverage > 0 Then
decPerimeter = (decLength decWidth) * 2
decArea = decPerimeter * decHeight

'Call Private Sub CalcRolls
Call CalcRolls(decArea, decRolls, decRollCoverage)


'Display Output
lblRolls.Text = decRolls.ToString
Else

'Display if number is not entered
MessageBox.Show("Please enter a number")
End If
End If


End Sub

Private Sub btnExit_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnExit.Click
'ends the application
Me.Close()
End Sub

Private Sub txtLength_Enter(ByVal sender As Object, ByVal e As System.EventArgs) Handles txtLength.Enter
txtLength.SelectAll()
End Sub
Private Sub txtWidth_Enter(ByVal sender As Object, ByVal e As System.EventArgs) Handles txtWidth.Enter
txtWidth.SelectAll()
End Sub
Private Sub txtHeight_Enter(ByVal sender As Object, ByVal e As System.EventArgs) Handles txtHeight.Enter
txtHeight.SelectAll()
End Sub
Private Sub txtRollCoverage_Enter(ByVal sender As Object, ByVal e As System.EventArgs) Handles txtRollCoverage.Enter
txtRollCoverage.SelectAll()
End Sub

Private Sub ClearLabel(ByVal sender As Object, ByVal e As System.EventArgs) _
Handles txtLength.TextChanged, txtWidth.TextChanged, txtLength.TextChanged, txtRollCoverage.TextChanged
lblRolls.Text = String.Empty
End Sub


End Class