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throw error msgs when two appointments are at the same time

Hello experts,

                     I need to create an application in VB .Net where the user will enter the reason to their appointment in a textbox and the time from a combo box. Upon entering the info and selecting a time, they enter these information through a button click event. I have two listbox where the first one stores the reason for the appointment and the second one stores the time. Now, I don't want them to enter two appointments at the same time. If they do so, I want to throw an error message saying "The appointment at this time already exists. Any help??

This is what I tried so far:

Under button1_Click event

But i don't know know how would I check to throw an error message if they have two appointments at the same time.
1 Solution
Hi there,

you can try searching the Items property of the listbox by using the contains method. In this case if it contains the item you don't want it to be added and a message appears:

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
       'see if the item is already listed
        If TimeList.Items.Contains(TimesCombo.SelectedItem) Then
            MessageBox.Show("Some kind of error message")            
            'other stuff added
        End If

hope this helps
    End Sub
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