DataSource Controls :: Post The Code To Get Data From Sql Into A List?

I have this code but dunno how to get the data from the existing sqldatasource1 into the list.

ie the code for this line: ' Get Data from Database and Fill DataReader and we will pass values to List

The sqldatasource1 returns only one field of data called holiday which is a date field.

<%@ Page Title="" Language="VB" MasterPageFile="~/00_MasterPage.master" %>
<script runat="server">
Private Function GetPublicHolidays() As List(Of DateTime)
Dim list As New List(Of DateTime)()
' Get Data from Database and Fill DataReader and we will pass values to List
End Function
</script>
<asp:SqlDataSource ID="SqlDataSource1" runat="server"></asp:SqlDataSource>