insert multiple list box value in database

I have checkboxlist having values as A , B , C , D now and user in the textbox now when i click on the save button the value of the checkboxlist whichever is selected like 1 , b , c or a , b , d like combination
the value gets saved into database seprately in each row against the user or value entered in the textbox
 
and how can i get back the value when i click on the edit button the vale gets back to the respective checkbox

<asp:CheckBoxList ID="CheckBoxList1" runat="server"
                        RepeatDirection="Horizontal">
                        <asp:ListItem>Sun</asp:ListItem>
                        <asp:ListItem>Mon</asp:ListItem>
                        <asp:ListItem>Tue</asp:ListItem>
                        <asp:ListItem>Wed</asp:ListItem>
                        <asp:ListItem>Thu</asp:ListItem>
                        <asp:ListItem>Fri</asp:ListItem>
                        <asp:ListItem>Sat</asp:ListItem>
                        <asp:ListItem>Sun</asp:ListItem>
                    </asp:CheckBoxList>
 
        <asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>
        <asp:Button ID="Button1" runat="server" Text="Save" onclick="Button1_Click"
              Width="82px" />