How to show the multiple ComboBoxAdv with same datasource?

private List<string> GetList()
{
    //List collection.
    List<string> months = new List<string>();
    months.Add("Windows Forms");
    months.Add("WPF");
    months.Add("WindRT");
    months.Add("JavaScript");
    months.Add("Android");
    return months;
}
private void Monthlist(Syncfusion.Windows.Forms.Tools.ComboBoxAdv comboBoxAdv, List<string> list)
{
    //To get the data source.
    comboBoxAdv.DataSource = list;
}
//To assign data source to the ComboBoxAdv.
Monthlist(comboBoxAdv1,GetList());
Monthlist(comboBoxAdv2, GetList());
Monthlist(comboBoxAdv3, GetList());

Private Function GetList() As List(Of String)
 'List collection.
 Dim months As New List(Of String)()
 months.Add("Windows Forms")
 months.Add("WPF")
 months.Add("WindRT")
 months.Add("JavaScript")
 months.Add("Android")
 Return months
End Function
Private Sub Monthlist(ByVal comboBoxAdv As Syncfusion.Windows.Forms.Tools.ComboBoxAdv, ByVal list As List(Of String))
 'To get the data source.
 comboBoxAdv.DataSource = list
End Sub
'To assign data source to the ComboBoxAdv.
Monthlist(comboBoxAdv1,GetList())
Monthlist(comboBoxAdv2, GetList())
Monthlist(comboBoxAdv3, GetList())