Multiple Checked Items from CheckBoxList

I try to get multiple checked items into one coloumn in my db. But i only get the first selected.
This is my sub:
 
Protected Sub SubmitBtn_Click(ByVal sender As Object, ByVal e As System.EventArgs) Dim Valg as string If valgBox.Items(0).Selected Then valg += "10til15" & ", " If valgBox.Items(1).Selected Then valg += "10til12" & ", " If valgBox.Items(2).Selected Then valg += "12til15" & ", " If valgBox.Items(3).Selected Then valg += "13til15" & ", " SqlDataSource1.Insert() Response.Redirect("farvel.html") End Sub  
My CheckBoxList:
<asp:CheckBoxList ID="valgBox" runat="server" AutoPostBack="True"> <asp:ListItem value="10-15">Jeg deltager fra kl. 10.00 - 15.00</asp:ListItem> <asp:ListItem value="10-12">Jeg deltager fra kl. 10.00 - 12.00</asp:ListItem> ...