Comparing values of dropdownlists generated by a repeater ASP.NET(vb)

I have a series of dropdown lists bound to a repeater control. Upon clicking a button, I want to compare the values of all of the dropdown lists produced by the repeater and validate that none of the selected values match. how do I do this?
Mike MillerSoftware EngineerAsked:
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Carl TawnSystems and Integration DeveloperCommented:
You could try something like the following:
    Protected Sub Button1_Click(sender As Object, e As EventArgs)

        Dim uniqueValues As New List(Of Integer)
        Dim areUnique As Boolean
        Dim ddl As DropDownList

        areUnique = True
        For Each row As RepeaterItem In Repeater1.Items

            ddl = CType(row.FindControl("DropDown1"), DropDownList)
            If Not uniqueValues.Contains(ddl.SelectedValue) Then
                uniqueValues.Add(ddl.SelectedValue)
            Else
                areUnique = False
                Exit For
            End If

        Next

    End Sub

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Obviously you'll need to change the names of the various controls to suit your own environment.
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