text box use to populate array

I want to create an application that:
is a form with a text box and a label

the text box recieves numeric input (values 1-20)

then upon pressing the enter key on the key board
the text in the text box populates a dynamic array, and if the
value is already there the label displays the value that was
entered (the duplicate value).

I know how to set up the GUI but I don't know how to make this work right. Please help as soon as you can. I have a deadline of 6pm Monday July 19th that I have to meet.

any help is appreciated.

perhaps

VB Code:

Dim a As New ArrayList()
   Private Sub TextBox1_KeyDown(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyEventArgs) Handles TextBox1.KeyDown
      If e.KeyCode = Keys.Enter Then
         If Not isThere(TextBox1.Text) Then
            a.Add(TextBox1.Text)
         Else
            MessageBox.Show(String.Format("{0} is in the ArrayList", TextBox1.Text))
         End If
      End If
   End Sub
 
   Function isThere(ByVal s As String) As Boolean
      Dim o As Object
      For Each o In a
         If s = o.ToString Then
            Return True
         End If
      Next
      Return False
   End Function
 
   Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
      Dim o As Object
      Dim s As String
      For Each o In a
         s &= o.ToString & Constants.vbCrLf
      Next
      MessageBox.Show(s)
   End Sub

if not, sorry...

Hi,

If I understand you, try

VB Code:

Dim arrTest(21)  As Boolean   '  Form wide scope
 
Private Sub TextBox1_KeyDown(ByVal sender As Object, 
       ByVal e As System.Windows.Forms.KeyEventArgs) Handles
      TextBox1.KeyDown
      If e.KeyCode = Keys.Enter Then
             If arrtest(cint(TextBox1.Text)) = True then
                 Label1.Text=TextBox1.Text
             Else
                 Label1.Text=""
             End If
             arrTest(cint(TextBox1.Text))=True
      End If
End Sub

Thanks for the quick response I just had to tweak what you gave me a little to make it work and wa la. I'm new to VB and VB.Net as well so I just needed a little guidance that's all.

Thanks again,
tiffjoe