Dim query = From n As Integer In [Enum].GetValues(GetType(DialogResult))
            Select New With {n, .Valor = [Enum].GetName(GetType(DialogResult), n)}

ComboBox1.DataSource = query.ToList()
ComboBox1.DisplayMember = "Valor"
ComboBox1.ValueMember = "n"

Bind Enum to Combobox

VB.NET