Manage A SqlDataSource In Code Behind (VB.Net)

Hi All

 It´s my DropDownList data source from my page1.aspx:

<asp:DropDownList ID="ddlChampionships" runat="server" DataSourceID="sdsSearchChampionships" DataTextField="name" DataValueField="id_championship">     </asp:DropDownList><asp:SqlDataSource ID="sdsSearchChampionships" runat="server" ConnectionString="<%$ ConnectionStrings:LocalSqlServer %>"

ProviderName="System.Data.SqlClient" SelectCommand="SELECT * FROM [Tupi_Campeonatos]"></asp:SqlDataSource>
When I put a new championship name in a TextBox and click on the button "ADD", this button event click is called:

 Protected Sub btAddChampionship_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles btAddChampionship.Click
     insertNewChampionshipIntoDataBase()
End Sub

The Page then reloads but my DropDownList is not updated. The way I found to do it is to put the DDList update code after the calling of the insertNewChampionshipIntoDataBase() method, but how???

thnx