How do I put different color for each spline line in my data chart ?

Private Sub DataCharts()
        Dim dt As DataTable = GetData("Chart_Monthly1")
        Dim departments As List(Of String) = (From p In dt.AsEnumerable()
                                              Select p.Field(Of String)("Department")).Distinct().ToList()
        If Chart1.Series.Count() = 1 Then
            Chart1.Series.Remove(Chart1.Series(0))

        End If
        _Chart1.Series.Clear()
        For Each department As String In departments
            Dim x As String() = (From p In dt.AsEnumerable()
                                 Where p.Field(Of String)("Department") = department
                                 Order By p.Field(Of String)("year")
                                 Select p.Field(Of String)("year")).ToArray

            Dim y As Decimal() = (From p In dt.AsEnumerable()
                                  Where p.Field(Of String)("Department") = department
                                  Order By p.Field(Of String)("year")
                                  Select p.Field(Of Decimal)("Total")).ToArray()

            Chart1.Series.Add(New Series(department))
            Chart1.Series(department).IsValueShownAsLabel = True
            Chart1.Series(department).BorderWidth = 2
            Chart1.Series(department).ChartType = SeriesChartType.Spline
            Chart1.Series(department).Points.DataBindXY(x, y)
            Chart1.Series(department).LabelForeColor = Color.MediumSeaGreen
        Next
        Chart1.Legends(0).Enabled = True

    End Sub