I am having problem with a button the code of my button is.
Private Sub btnCalculateCosts_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnCalculateCosts.Click
it handles:
' This Calculate Costs button click event handler edits the
' registration(costs) form to ensure it contains valid data.
' Then, after passing control to the business class, it
' displays the registration cost.
Dim objCourse As Course
Dim objCourseCostsFile As Course
Dim InputError As Boolean = False
' Is student ID entered properly
If Me.txtCorporateID.MaskFull = False Then
MessageBox.Show("Enter your Corporate ID in the Corporate ID box", _
"Error")
Me.txtCorporateID.Clear()
Me.txtCorporateID.Focus()
InputError = True
' Is student name entered properly
ElseIf Me.txtFirstName.TextLength < 1 Or _
Me.txtFirstName.Text < "A" Then
MessageBox.Show("Please enter your first name in the First Name box", "Error")
Me.txtFirstName.Clear()
Me.txtFirstName.Focus()
InputError = True
' Is number of units entered properly
ElseIf Me.txtLastName.TextLength < 1 Or _
Me.txtLastName.Text < "A" Then
MessageBox.Show("Please enter your last name in the Last Name box", "Error")
Me.txtLastName.Clear()
Me.txtLastName.Focus()
InputError = True
' Is number of units entered properly
ElseIf Not IsNumeric(Me.txtNumberOfDays.Text) Then
MessageBox.Show("Enter the units in the Number of Units box", _
"Error")
Me.txtNumberOfDays.Clear()
Me.txtNumberOfDays.Focus()
InputError = True
' Has 1-4 units been entered
ElseIf Convert.ToInt32(Me.txtNumberOfDays.Text) < 1 _
Or Convert.ToInt32(Me.txtNumberOfDays.Text) > 4 Then
MessageBox.Show("Units must be 1 - 4", "Error")
Me.txtNumberOfDays.Clear()
Me.txtNumberOfDays.Focus()
InputError = True
End If
' If no input error, process the registration costs
If Not InputError Then
If Me.radPreConferenceCourse.Checked = False Then
objCourse = New Course(txtCorporateID.Text, txtFirstName.Text, txtLastName.Text, txtNumberOfDays.Text)
Me.lblCosts.Visible = True
Me.lblCosts.Text = "Total Conference Costs Are: " _
& (objCourse.ComputeCosts()).ToString("C2")
Else
objCourse = New Course(txtCorporateID.Text, txtFirstName.Text, txtLastName.Text, txtNumberOfDays.Text, g)
Me.lblCosts.Visible = True
Me.lblCosts.Text = "Total Conference Costs Are: " _
& (objCourse.ComputeCosts()).ToString("C2")
Receiving the error: Handles clause requrieres a WithEvents variable defined in the containing type or one of its base types.
